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2019

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Articles 3421 - 3450 of 10505

Full-Text Articles in Engineering

Three-Dimensional Numerical Modeling Of A Scroll Vortex Intake, S. N. Chan Jun 2019

Three-Dimensional Numerical Modeling Of A Scroll Vortex Intake, S. N. Chan

International Junior Researcher and Engineer Workshop on Hydraulic Structures

Scroll vortex intakes are vortex drop structures commonly used in water supply, drainage and sewerage systems, characterized by a vortex chamber with its wall curling inwards to the dropshaft and a horizontal bottom. The stormwater flows into the intake via an eccentrical approach channel, which imparts vortex motion to the flow, forming a swirling vortex flow with a stable air core through the center of dropshaft. Over past decades, much effort has been devoted to investigating the scroll intake vortex flow, yet the understanding and predictions of the vortex flow is still far from complete due to a lack of …

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Large-Eddy Simulations Of T-Shaped Open-Channel Confluences With Different Downstream Channel Widths, Pedro Xavier Ramos, Laurent Schindfessel, João Pedro Pêgo, Tom De Mulder Jun 2019

Large-Eddy Simulations Of T-Shaped Open-Channel Confluences With Different Downstream Channel Widths, Pedro Xavier Ramos, Laurent Schindfessel, João Pedro Pêgo, Tom De Mulder

International Junior Researcher and Engineer Workshop on Hydraulic Structures

Confluences of open-channel flows are common in nature as well as in urban drainage networks and in hydraulic structures. The complex hydrodynamics is often studied in schematized, right-angled confluences. In this paper, the influence of the downstream channel width onto time-averaged and turbulent flow features will be investigated numerically, based on Large-Eddy Simulations. For one flow situation, i.e. flow ratio and downstream Froude number, two geometries will be compared: a discordant width case, which was studied experimentally by Yuan et al. (2016) in a flume with a wider downstream channel than the upstream mean and tributary channels, and the corresponding …

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Spillway Debris Physical Model Study Morning Glory Spillway, Melissa Shinbein Jun 2019

Spillway Debris Physical Model Study Morning Glory Spillway, Melissa Shinbein

International Junior Researcher and Engineer Workshop on Hydraulic Structures

In this 1:18 Froude scale physical hydraulic model study, woody debris was introduced into a reservoir upstream of a morning-glory spillway at different flow rates causing jams. The purpose of this study is to ascertain the frequency of woody debris clogs in the crest, mouth, transition, or a combination of the three in the morning-glory spillway over varying flow rates. Because of the random nature of debris loading into reservoirs (flux, density, species, length, diameter, branch complexity, etc.), a variety of woody species were used to represent prototype lengths of 10 feet to 35 feet and diameters of 0.5 feet …

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Streamflow Regime Change In The Delaware River Basin, Travis Shoemaker, Madhav Bista, David Brandes Jun 2019

Streamflow Regime Change In The Delaware River Basin, Travis Shoemaker, Madhav Bista, David Brandes

International Junior Researcher and Engineer Workshop on Hydraulic Structures

The combined impacts of hydroclimatic change and land development are widely expected to increase the frequency and magnitude of flooding in the northeast United States, with potential implications to floodplain infrastructure and mapping, hydraulic structures, land management, and flood losses. Additionally, shifting flow regimes pose a challenge for engineers and regulators of stormwater management, dams, and levees because design storms are commonly based on historical data, with the stationarity assumption that the future flow regime will mimic the past. Here, we examine selected long-term (40 to 114 years of data) streamflow records from watersheds of varying size in the upper …

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Composite Experimental And Numerical Modeling Of Arced Labyrinth Weirs, Seth Thompson, Blake Tullis Jun 2019

Composite Experimental And Numerical Modeling Of Arced Labyrinth Weirs, Seth Thompson, Blake Tullis

International Junior Researcher and Engineer Workshop on Hydraulic Structures

Arced labyrinth weirs are a viable option for existing spillway retrofit due to their increased flow capacity. This study supplies additional arced labyrinth weir hydraulic design empirical data and uses this data to validate a numerical model (utilized Flow-3D) of the same experimental setup. The dimensionless discharge coefficient relationship is presented for the physical model, potential errors due to physical model crest referencing are discussed, and the relative and absolute errors along with a grid convergence study are given for the numerical model.

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Comparison Of Modelling Approaches For Development Of Discharge Rating Curves For Spillway/Bridge Combinations, Nathan Young Jun 2019

Comparison Of Modelling Approaches For Development Of Discharge Rating Curves For Spillway/Bridge Combinations, Nathan Young

International Junior Researcher and Engineer Workshop on Hydraulic Structures

When estimating spillway discharge rating curves, engineers can use a variety of methods such as empirical equations, one- (1D) or two-dimensional (2D) hydraulic computer models, or a combination thereof; however, conservative assumptions are often applied to such methods. The use of three-dimensional (3D) computational fluid dynamics (CFD) models is an alternative modelling approach that can often better estimate spillway discharge rating curves, especially for complex flow situations. In this study, the results of 3D CFD models are compared to estimates of spillway discharge rating curves developed with a combination of empirical equations and other hydraulic computer models for spillway/bridge combinations. …

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Development Of Automated Control Systems For Pilot-Scale Combustors In The New Byu Engineering Building Annex, Andrew Fry Jun 2019

Development Of Automated Control Systems For Pilot-Scale Combustors In The New Byu Engineering Building Annex, Andrew Fry

Journal of Undergraduate Research

The purpose of this MEG grant was to train 3 undergraduate students from either Chemical or Mechanical Engineering on the use of OPTO 22 control system and then to direct them, along with the input from engineers at OPTO 22, as they build and install a control system and logic for the Burner Flow Reactor (BFR), Multi Fuel Reactor (MFR) and the Pressurized Oxy Coal (POC) reactors in the new Engineering Research Laboratory (ERL). This program is comprised of 6 tasks as follows:

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Physical Model Testing Of Supercritical Flow Diversion For Combined Sewer Overflow Control, Tony Loeser Jun 2019

Physical Model Testing Of Supercritical Flow Diversion For Combined Sewer Overflow Control, Tony Loeser

International Junior Researcher and Engineer Workshop on Hydraulic Structures

In this study, a 1:8 scale physical hydraulic model was used to demonstrate that a novel widening ramp concept was applicable for diverting supercritical inflows for a proposed regulator chamber and also to establish design dimensions for the proposed structure to meet project goals. The following conclusions were determined from the testing. The widening ramp concept proposed for this project was able to adequately pass the full range of design inflows of 0-425 MGD without experiencing undesirable flow conditions that would produce excessive water depths while meeting the diversion goals of the project. The proposed diversion conduit could adequately pass …

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Numerical Study Of Froude Number And Submergence Ratio And Their Affect On Hydraulic Jump Flow Patterns For A Backward Facing Step, Kurt Smithgall Jun 2019

Numerical Study Of Froude Number And Submergence Ratio And Their Affect On Hydraulic Jump Flow Patterns For A Backward Facing Step, Kurt Smithgall

International Junior Researcher and Engineer Workshop on Hydraulic Structures

The surface recirculation region (SRR), or roller of a conventional hydraulic jump, can pose a safety hazard to recreational river users. In contrast, for an undular hydraulic jump (UHJ), the recirculation region lies submerged on the channel bed and does not pose the same risk. For a river engineer designing whitewater parks, it is crucial to know the conditions of undular hydraulic jump formation at instream structures; it can mean the difference between life and death for recreational river users. However, most existing literature has established conditions of UHJ formation only for the case of a plain bed rectangular channel, …

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Beyond Floodplain Analysis: A Modeler’S Experience Using Hec-Ras 2d For Spillway Assessments And Designs, Yan Wang, Amanda Hess, Gregory Richards Jun 2019

Beyond Floodplain Analysis: A Modeler’S Experience Using Hec-Ras 2d For Spillway Assessments And Designs, Yan Wang, Amanda Hess, Gregory Richards

International Junior Researcher and Engineer Workshop on Hydraulic Structures

HEC-RAS 5.0 (2D) has been increasingly used by the dam safety community for performing dam breach and other hydraulic analyses since its debut in 2015. While this two-dimensional hydraulic modeling software has wide applications in dam breach analysis and urban flood simulation, its ability to analyze complex multidirectional flow problems can also be used as a design tool for spillways, overtopping protection, and other hydraulic structures. In this manuscript, the authors discussed their experience using HEC-RAS and other two-dimensional hydraulic models to design and assess various hydraulic structures. This includes: 1) sizing spillway outlet channels and assessing the hydraulic adequacy …

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Full Proceedings: Ijrewhs 2019, International Association For Hydro-Environmental Engineering And Research Jun 2019

Full Proceedings: Ijrewhs 2019, International Association For Hydro-Environmental Engineering And Research

International Junior Researcher and Engineer Workshop on Hydraulic Structures

Full proceedings for the 7th International Junior Researcher and Engineer Workshop on Hydraulic Structures.

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Modeling Of A Novel Submerged Oscillating Water Column (Sowc) Energy Harvester, Mohammadamin Torabi, Bruce Savage Jun 2019

Modeling Of A Novel Submerged Oscillating Water Column (Sowc) Energy Harvester, Mohammadamin Torabi, Bruce Savage

International Junior Researcher and Engineer Workshop on Hydraulic Structures

Wave energy converters (WEC) are hydraulic structures that are used to harvest energy from oceans. This research explores a new concept of a WEC termed a Submerged Oscillating Water Column (SOWC). Numerical simulations using the Computational Fluid Dynamics (CFD) code Flow-3D and physical model tests were carried out at Idaho State University to assess the validity and efficiency of the proposed device. The SOWC device consists of two submerged chambers that are connected to allow airflow between the two as waves pass; ideally spaced at half a wavelength. The results of the CFD modeling for seventeen different geometries with linear …

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Table Of Contents, The Editors Jun 2019

Table Of Contents, The Editors

Coal Geology & Exploration

No abstract provided.

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The Development Of Seismic-While-Mining Detection Technology In Underground Coal Mines, Cheng Jianyuan, Qin Si, Lu Bin, Wang Baoli, Wang Ji Jun 2019

The Development Of Seismic-While-Mining Detection Technology In Underground Coal Mines, Cheng Jianyuan, Qin Si, Lu Bin, Wang Baoli, Wang Ji

Coal Geology & Exploration

The explosive source of underground seismic exploration in coal mines is greatly affected by the control of pyrotechnics and cannot realize the monitoring and early warning of dynamic geological disasters in coal mining. Seismic-while-mining(SWM) is a new technique based on shearer as a seismic source underground. The paper reviewed the research status of SWM technique at home and abroad, introduced the SWM's principle and its unique advantages. According to some pilot experiments of SWM, the results show that the shearer can be used as a seismic source because it has the character of strong excitation energy, wide frequency band, safety, …

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Method Of Transparent Working Face Based On Dynamic Detection Of Cross Hole Seismic Subdivision, Lu Bin Jun 2019

Method Of Transparent Working Face Based On Dynamic Detection Of Cross Hole Seismic Subdivision, Lu Bin

Coal Geology & Exploration

Transparent working surface is an important part of intelligent coal mining. It provides detailed geological structure information of working face for intelligent coal mining. This paper proposes a working surface exploration method based on segmented and dynamic cross-hole seismic, which can realize progressive fine detection of coal working face. The method is a new development with seismic while mining, which is using the coal cutter as seismic source. The main idea is to image the working face segmented by deploying some detectors in a series of horizontal holes parallel to the long wall. The method performs fine imaging on the …

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Simulation Of Seismic-While-Mining With Shearer As Source Of Fully Mechanized Mining Face, Jin Dan Jun 2019

Simulation Of Seismic-While-Mining With Shearer As Source Of Fully Mechanized Mining Face, Jin Dan

Coal Geology & Exploration

In order to analyze the wave field characteristics of seismic-while-mining data excited by coal cutter as seismic source, forward simulation was used to calculate seismic data. We transform the cutting mode of spiral drum and the stress of drum into the force function of seismic source, which is added to the wave equation in the form of load distribution at different time and location. Wave equation is solved by high-order staggered-style finite difference method. Finally, the seismic data obtained by numerical simulation show that shear wave energy is very strong and press wave energy is very weak in the wave …

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Geological Evaluation Model For Site Selection Of Underground Coal Gasification Without Well In Jinghai Coal-Bearing Area, Tianjin, China, Wang Zhigang, Fu Xiaojin, Liang Jie, Cao Jian, Jiang Shengguo Jun 2019

Geological Evaluation Model For Site Selection Of Underground Coal Gasification Without Well In Jinghai Coal-Bearing Area, Tianjin, China, Wang Zhigang, Fu Xiaojin, Liang Jie, Cao Jian, Jiang Shengguo

Coal Geology & Exploration

Based on the 4 factors such as exploration status, coal seam, coal quality and hydrological conditions, using the secondary fuzzy comprehensive evaluation method, the geological evaluation model without well was built. In order to verify the applicability of the model, the material balance by law of conservation of mass was carried out and the results compared with the test results of indoor model was got. This research suggests that the weight of geological conditions affecting underground coal gasification without well is exploration status > conditions of coal seam > hydrological conditions > coal quality, the area with comprehensive score higher than 70 is …

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Study On The Biodegradation Of Guanidine Gum By Methanogens In Coal Seam, Li Yunsong, Guo Hongyu, Fu Chaoyong, Zhao Guojun, Xia Daping Jun 2019

Study On The Biodegradation Of Guanidine Gum By Methanogens In Coal Seam, Li Yunsong, Guo Hongyu, Fu Chaoyong, Zhao Guojun, Xia Daping

Coal Geology & Exploration

The problem of low temperature breaking of guanidine gum fracturing fluid is related to the effect of coal seam penetration. In order to explore the effect of methanogenson the biodegradation of guanidine gum, Inner Mongolia some coal mine lignite were collected to prepare samples of coal samples, and the enriched fresh mine water was used as the bacteria source. The biological methane metabolism experiments of guanidine gum + coal were used to characterize the biodegradability of methanogens to guanidine gum, with the total gas production, CH4 concentration, guanidine gum molecular functional groups and C and H elements content changes. …

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Productivity Prediction Of Hypotonic Cbm Test Well In Jiaozuo Mining Area Under Hydraulic Fracturing, Wang Zhirong, Yang Jie, Chen Lingxia, Guo Zhiwei Jun 2019

Productivity Prediction Of Hypotonic Cbm Test Well In Jiaozuo Mining Area Under Hydraulic Fracturing, Wang Zhirong, Yang Jie, Chen Lingxia, Guo Zhiwei

Coal Geology & Exploration

In order to explore the permeable mechanism and the output law after fracturing of CBM in the "three soft" coal seam(soft coal, soft roof and soft bottom) of Jiaozuo under hydraulic fracturing, Based on the permeable model of reservoir fracture, considering the influence of fracture porosity on permeability after fracturing, a reservoir fracture penetration model was established, the application and analysis of the test well was carried out to obtain the characteristics of pressure cracks such as length, width, permeability and reservoir parameters after fracturing. Through the comprehensive analysis of isothermal adsorption curves and historical fitting, the recovery rate of …

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Simulation And Test Of Enhancement Of Gas Drainage Through Co2 Injection Into Coal Seam Of Low Permeability, Bai Gang, Zhou Xihua, Wei Shiping, Fan Chaojun, Li Xueming Jun 2019

Simulation And Test Of Enhancement Of Gas Drainage Through Co2 Injection Into Coal Seam Of Low Permeability, Bai Gang, Zhou Xihua, Wei Shiping, Fan Chaojun, Li Xueming

Coal Geology & Exploration

In view of the difficulty of gas extraction and low drainage efficiency in coal seam of low permeability, based on multi component gas competitive adsorption of CO2-CH4, simulation and test for improving seam gas extraction rate through CO2 injecting CO2 into coal seam were carried out. A fluid-solid coupling model considering gas-water phases and Klinkenberg effect of CO2 injection into coal seam for enhancement of gas drainage was established, parameters of gas pressure, gas content and gas extraction rate after coal seam CO2 injection were analyzed by using COMSOL software and applied …

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Genesis And Geochemical Characteristics Of Coalbed Methane From Taiyuan Formation In Sijiazhuang Mine Field Of Yangquan Mining Area, Yu Zhenfeng, Hao Chunsheng, Yang Changyong, Yao Jinbao, Wang Wei, Ji Changjiang Jun 2019

Genesis And Geochemical Characteristics Of Coalbed Methane From Taiyuan Formation In Sijiazhuang Mine Field Of Yangquan Mining Area, Yu Zhenfeng, Hao Chunsheng, Yang Changyong, Yao Jinbao, Wang Wei, Ji Changjiang

Coal Geology & Exploration

In order to study the geochemical characteristics and the genesis of CBM of Sijiazhuang mine field in Yangquan mining area, the in-site desorption test of coal core samples from the main gas-producing seams(seams 8, 9 and 15) from Permo-Carboniferous Taiyuan Formation was carried out systematically, gas samples were collected to conduct component and carbon isotope analysis. The results indicated that the gas content of seam 8 was higher than that of seam 9, on the plan the gas content of seam 15 was uneven, in some parts there was almost no gas. During the whole desorption, the gas component content …

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Effects Of Pressure Drop Funnels Model Of Different Shapes On Cbm Well Productivity, Hu Haiyang, Jin Jun, Zhao Lingyun, Chen Jie, Gu Jiaoyang Jun 2019

Effects Of Pressure Drop Funnels Model Of Different Shapes On Cbm Well Productivity, Hu Haiyang, Jin Jun, Zhao Lingyun, Chen Jie, Gu Jiaoyang

Coal Geology & Exploration

In order to study the effect of pressure drop funnel shapes on CBM well productivity, the change law of pressure and the shape of pressure drop funnel in different drainage stages of CBM wells were discussed, the mathematical models of pressure drop funnel were established, the concept of "desorption coefficient" and "effective desorption coefficient" for coal reservoir were proposed to quantitative study desorption effect of the coal reservoir. Taking a CBM well in the west of Guizhou as an example, the research results show that the logarithmic function model of pressure distribution of radial flow is difficult to accurately reflect …

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Formation Mechanism Of Coal Seam Aquifer And Water Hazard Control Technology, Wang Hao Jun 2019

Formation Mechanism Of Coal Seam Aquifer And Water Hazard Control Technology, Wang Hao

Coal Geology & Exploration

Coal seams occur in Peat formation formed by sediments, often used as aquiclude or aquitard in coal production. However, in Barapukuria coal mine in Bangladesh, No.VI coal seam is rich in water, shows a typical hydrogeological phenomenon that the coal seam becomes an aquifer, which is rare in coal mining process both in China and abroad. From the formation mechanism of coal and the microstructure and tectonic development characteristics of coal, the structure of rich in water of coal was revealed. Based on MTS815 rock mechanics test system, the permeability of No.VI coal was tested, and the internal structure of …

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Water Yield Analysis Of Underground Drainage Boreholes On The Basis Of Logarithmic Normal Distribution, Ma Lianjing, Zhao Baofeng Jun 2019

Water Yield Analysis Of Underground Drainage Boreholes On The Basis Of Logarithmic Normal Distribution, Ma Lianjing, Zhao Baofeng

Coal Geology & Exploration

In order to analyze the distribution rule of water flow from underground drainage borehole in coal mines, histogram, Q-Q chart and nonparametric tests were used to test the logarithmic normal distribution model for water flow from underground drainage borehole in typical working face, and the nonlinear regression model was fitted. Combined with hydrogeological conditions, the parameters in the model were analyzed. The result shows that water flow from underground drainage boreholes in working face obeys the lognormal distritution. The logarithmic mean and standard deviation of water flow from drainage borehole of typical working face have a positive linear dependence relation …

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Prediction Of The Height Of Water Flowing Fractured Zone Under Subcritical Mining Based On Dimensional Analysis, Lou Gaozhong, Guo Wenbing, Gao Jinlong Jun 2019

Prediction Of The Height Of Water Flowing Fractured Zone Under Subcritical Mining Based On Dimensional Analysis, Lou Gaozhong, Guo Wenbing, Gao Jinlong

Coal Geology & Exploration

In order to accurately predict the height of water flowing fractured zone under subcritical mining, mining thickness M, mining depth H, inclined length of working face L, dip angle of coal seam α, overburden mechanical properties R, overburden structure characteristics S were selected as the main influencing factors on the height of water flowing fractured zone under subcritical mining. Dimensionless relations between the height of water flowing fractured zone and M, H, L, α, S were established by dimensional analysis. Based on 30 sets of measured data, the optimal function relation of dimensionless relation was …

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Ga_Svm_Adaboost Model For Prediction Of Earthquake-Induced Sandy Soil Liquefaction, Mao Zhiyong, Huang Chunjuan, Lu Shichang Jun 2019

Ga_Svm_Adaboost Model For Prediction Of Earthquake-Induced Sandy Soil Liquefaction, Mao Zhiyong, Huang Chunjuan, Lu Shichang

Coal Geology & Exploration

In order to predict the liquefaction of sand, the seismic intensity, groundwater level, covering thickness, standard number, average particle size, landform, soil quality and inhomogeneity coefficient are selected as influencing factors. Genetic algorithm(GA) is used to optimize the parameters of support vector machine(SVM) by using correlation analysis and factor analysis model, and combining with Adaboost iterative algorithm, the GA_SVM_Adaboost model for predicting the liquefaction of sand is established. 329 sets of survey data of sandy liquefaction site in Tangshan earthquake were used to train the model, and 68 samples of sandy liquefaction data were predicted by using the good model. …

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Comparison Of Dissolution Characteristics Of Organic Matter In Coal Gangue Of Different Geological Time, Sun Yanfang, Zhao Li, Luo Shaohe, Zhang Lei, Sun Chao, Li Bowen Jun 2019

Comparison Of Dissolution Characteristics Of Organic Matter In Coal Gangue Of Different Geological Time, Sun Yanfang, Zhao Li, Luo Shaohe, Zhang Lei, Sun Chao, Li Bowen

Coal Geology & Exploration

Taken the unweathered coal gangues obtained from the Jurassic coalbed of Bulianta mine and the Car-boniferous-Permian coalbed of Baode mine located in Shendong mining area as the research subjects, the dissolution characteristics of organic matter in two kinds of coal gangues were studied comparatively through soaking experiments, and combined with three-dimensional fluorescence spectrometry and parallel factor analysis. It is significant for the underground reservoir to study mechanism of water treatment in coal mining areas. These results indicate that the total ion concentration in DOM sample of coal gangue of Bulianta mine is higher than that of Baode mine due to …

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Effect Of Clay Content On Shear Strength Of Loess, Wang Li, Li Xi'an, Hong Bo, Du Shaoshao, Zhang Hangbo, Zhao Ning Jun 2019

Effect Of Clay Content On Shear Strength Of Loess, Wang Li, Li Xi'an, Hong Bo, Du Shaoshao, Zhang Hangbo, Zhao Ning

Coal Geology & Exploration

The experimental research about effect of different clay content on shear strength of loess was carried out to reveal the influence of clay content on shear strength and its microscopic mechanism, and then a scientific basis for engineering practice of loess was provided. Self-made wet sieve device under negative pressure was applied to screen loess samples with different clay content. Different clay content of the loess samples were made to the same dry density, but with different moisture content using static pressure method, and then were taken direct shear test. The results show that with the increase of moisture content, …

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Feasibility Test Of Roof Resistivity Monitoring For Super-High Mining Face, Lu Jingjin, Li Deshan, Wang Bingchun Jun 2019

Feasibility Test Of Roof Resistivity Monitoring For Super-High Mining Face, Lu Jingjin, Li Deshan, Wang Bingchun

Coal Geology & Exploration

The failure of roof overburden is one of the main reasons for water inrush in mining working face. Roof resistivity monitoring by mine electrical method can be used to detect overburden failure dynamically. However, roof resistivity monitoring for super-high mining face has many problems, such as audio electromagnetic signal by conventional methods is difficult to penetrate through wide working face, burying of roof monitoring electrodes is difficult, monitoring electrode in the roof of air return lane is hard to protect, and so on. In order to solving these problems, feasibility study of roof resistivity monitoring for super-high mining face is …

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Experimental Study On The Influence Of Well Inclination Angle Of Coalbed Methane Well On The Cementation Strength Of Cement-Formation Interface, Gu Jun, Li Linwei, Sun Dexing Jun 2019

Experimental Study On The Influence Of Well Inclination Angle Of Coalbed Methane Well On The Cementation Strength Of Cement-Formation Interface, Gu Jun, Li Linwei, Sun Dexing

Coal Geology & Exploration

In order to control the problem of water channeling in the process of coalbed methane(CBM) production, based on the self-designed test device and method, the test data of the shear strength at cement-aquiclude interface (CAI) is obtained under the conditions of well inclination of 0°, 30°, 60° and 90°. The mechanism of the influence of inclination angle on the shear strength at CAI is analyzed. The results show that the shear strength at CAI decreases with the increase of the inclination angle. The reason is that as the inclination angle increases, the upper part of the mud cake ring becomes …

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