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Articles 751 - 755 of 755
Full-Text Articles in Aerospace Engineering
Computational Investigation Of Slot Blowing For Fuselage Forebody Flow Control, Scott M. Murman, Yehia M. Rizk, Russell M. Cummings, Lewis B. Schiff
Computational Investigation Of Slot Blowing For Fuselage Forebody Flow Control, Scott M. Murman, Yehia M. Rizk, Russell M. Cummings, Lewis B. Schiff
Aerospace Engineering
This paper presents a computational investigation of a tangential slot blowing concept for generating lateral control forces on an aircraft fuselage forebody. The effects of varying both the jet width and jet exit velocity for a fixed location slot are analyzed. This work is aimed at aiding researchers designing future experimental and computational models of tangential slot blowing. The primary influence on the resulting side force of the forebody is seen to be the jet mass flow rate. This influence is insensitive to different combination of slot widths and jet velocities over the range of variables considered. Both an actuator …
Bodner-Partom Viscoplastic Constitutive Model And The Non Linear Finite Element Analysis Of A Stress Concentration At High Temperature, Faysal A. Kolkailah, A. J. Mcphate
Bodner-Partom Viscoplastic Constitutive Model And The Non Linear Finite Element Analysis Of A Stress Concentration At High Temperature, Faysal A. Kolkailah, A. J. Mcphate
Aerospace Engineering
The design and analysis of structural components to operate at elevated temperature and severe stress levels, such as a low-cycle fatigue-limited jet engine disk, require an accurate prediction of the nonlinear stress-strain . response encountered during the cyclic loading conditions. Nonlinear analysis of such components is normally carried out by a finite element code making use of constitutive theories in which the material response is separated into the two important groups of phenomena known as rate dependent "creep" and rate independent "plasticity." A number of viscoplastic. constitutive theories in which "creep" and ''plasticity" effects are combined _into a unified plastic …
Numerical Simulation Of F-18 Fuselage Forebody Flows At High Angles Of Attack, Lewis B. Schiff, Russell M. Cummings, Reese L. Sorenson, Yehia M. Rizk
Numerical Simulation Of F-18 Fuselage Forebody Flows At High Angles Of Attack, Lewis B. Schiff, Russell M. Cummings, Reese L. Sorenson, Yehia M. Rizk
Aerospace Engineering
As part of the NASA High Alpha Technology Program, fine-grid Navier-Stokes solutions have been obtained for flow over the fuselage forebody and wing leading edge extension of the F/A-18 High Alpha Research Vehicle at large incidence. The resulting flows are complex, and exhibit crossflow separation from the sides of the forebody and from the leading edge extension. A well-defined vortex pattern is observed in the leeward-side flow. Results obtained for laminar flow show good agreement with flow visualizations obtained in ground-based experiments. Further, turbulent flows computed at high-Reynolds-number flight-test conditions (M∞ = 0.2, α = 30 °, and Re …
Numerical Representation Of Bodner Viscoplastic Constitutive Model, Faysal A. Kolkailah, Andrew J. Mcphate
Numerical Representation Of Bodner Viscoplastic Constitutive Model, Faysal A. Kolkailah, Andrew J. Mcphate
Aerospace Engineering
Nonlinear analyses of structural components are normally carried out by finite element codes making Use of constitutive theories in which the material response is separated into the two important groups of phenomena known as rate‐dependent “creep” and rate‐independent “plasticity.” A number of viscoplastic constitutive theories in which creep and plasticity effects are combined into a unified plastic strain model have recently been proposed and are still undergoing active development. In this paper, the constitutive equations of the Bodner‐Partom model are used to present the time dependent, inelastic properties of Inconel 718 at 650 °C. This representation covers a wide range …
An Update To The Mitre/Wpi Space Shuttle Prgoram: Gascan G-408, Fred J. Looft, William W. Durgin
An Update To The Mitre/Wpi Space Shuttle Prgoram: Gascan G-408, Fred J. Looft, William W. Durgin
Office of the Provost Scholarship
The objective of the MITRE/WPI Space Shuttle Program was to develop a set of scientific meaningful experiments that could be flown in a Get Away Special Canister. currently, the first GASCAN is finished (G-408) and ready to be launched. The program has been so successful that the design and development of a second set of experiments has been started (G-533). This paper will describe and summarize both of these programs.