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Full-Text Articles in Engineering
Design And Evaluation Of The Umass Wf-1 Kilowatt Hour Meter, Michael George Edds, Duane Cromack
Design And Evaluation Of The Umass Wf-1 Kilowatt Hour Meter, Michael George Edds, Duane Cromack
Wind Energy Center Reports
A kilowatt-hour meter was designed, built and evaluated for use with the UMass Wind Furnace. A meter, capable of measuring the variable frequency variable voltage output of the wind turbine, was needed. This report describes this somewhat unique instrument, including its design and calibration.
The Flow Field Upstream Of A Horizontal Axis Wind Turbine, K. Modarresi, R. H. Kirchhoff
The Flow Field Upstream Of A Horizontal Axis Wind Turbine, K. Modarresi, R. H. Kirchhoff
Wind Energy Center Reports
A mathematical model is developed for a steady-state axi-symmetric upstream flow of a porous disc, in a uniform flow field . The special case of the upstream flow of a windmill, with and without a nacelle, is treated. First, the windmill is considered as a uniform distribution of sources and then as a linear distribution of sources. Solutions for the blade disc o f the wind field upstream are obtained in the form of stream1 ines and velocity vector components. Sample flow patterns upstream o f the blade disc o f the UMass 25 kW wind turbine are presented for …
Wind Field Analysis Around A Horizontal Axis Wind Turbine, B. C. Donner, R. H. Kirchhoff
Wind Field Analysis Around A Horizontal Axis Wind Turbine, B. C. Donner, R. H. Kirchhoff
Wind Energy Center Reports
The dynamic interaction between the WMass 25 kW wind turbine, WF-1, and the local, turbulent wind field is investigated. The integral length scale for wind speed gusts is found to range from 40 to 200 m. The system i s seen to behave as a low pass filter with a cutoff frequency of 0.03 Hz. Power i n the wind with gust frequencies below the cutoff frequency is available to the wind turbine. This represents approximately 70% of the total power in the turbulence, and about 5% of the total power in the wind. The power extraction is independent
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Performance Matching Of Hydraulic Energy Converters And Wind Turbines For Heating Purposes, M. G. Rolland Jr., Duane E. Cromack, William E. Heronemus
Performance Matching Of Hydraulic Energy Converters And Wind Turbines For Heating Purposes, M. G. Rolland Jr., Duane E. Cromack, William E. Heronemus
Wind Energy Center Reports
An investigation of a fluid brake device designed to convert wind energy to heat is reported for small to moderate size wind turbine applications. Fluid devices of three different geometries with vaned rotors were examined for power capacity and operating range. Converted size and geometry was related to rotational speed through a parametric study of the wind turbine and fluid energy converters. Wind tunnel tests, laboratory experiments, and analytic techniques lead to the development of three candidate hydraulic convertersmatching the 10m diameter Wind Furnace Model Four.