A Discrete Vortex Method For Studying The Wing Rock Of Delta Wings
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Author | : Thomas G. Gainer |
Publisher | : |
Total Pages | : 82 |
Release | : 2002 |
Genre | : Aerodynamic measurements |
ISBN | : |
Download A Discrete-Vortex Method for Studying the Wing Rock of Delta Wings Book in PDF, Epub and Kindle
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : Independently Published |
Total Pages | : 80 |
Release | : 2018-09-22 |
Genre | : |
ISBN | : 9781723937125 |
Download A Discrete-Vortex Method for Studying the Wing Rock of Delta Wings Book in PDF, Epub and Kindle
A discrete-vortex method is developed to investigate the wing rock problem associated with highly swept wings. The method uses two logarithmic vortices placed above the wing to represent the vortex flow field and uses boundary conditions based on conical flow, vortex rate of change of momentum, and other considerations to position the vortices and determine their strengths. A relationship based on the time analogy and conical-flow assumptions is used to determine the hysteretic positions of the vortices during roll oscillations. Static and dynamic vortex positions and wing rock amplitudes and frequencies calculated by using the method are generally in good agreement with available experimental data. The results verify that wing rock is caused by hysteretic deflections of the vortices and indicate that the stabilizing moments that limit wing rock amplitudes are the result of the one primary vortex moving outboard of the wing where it has little influence on the wing.Gainer, Thomas G.Langley Research CenterWING ROCK; VORTICES; FLOW DISTRIBUTION; DYNAMIC STABILITY; DELTA WINGS; STABILIZATION; SWEPT WINGS; HYSTERESIS; FLOW VELOCITY; DEFLECTION; CONICAL FLOW; BOUNDARY CONDITIONS; ANALOGIES
Author | : National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : 80 |
Release | : 2018-08-27 |
Genre | : |
ISBN | : 9781726147910 |
Download A Discrete-vortex Method for Studying the Wing Rock of Delta Wings Book in PDF, Epub and Kindle
A discrete-vortex method is developed to investigate the wing rock problem associated with highly swept wings. The method uses two logarithmic vortices placed above the wing to represent the vortex flow field and uses boundary conditions based on conical flow, vortex rate of change of momentum, and other considerations to position the vortices and determine their strengths. A relationship based on the time analogy and conical-flow assumptions is used to determine the hysteretic positions of the vortices during roll oscillations. Static and dynamic vortex positions and wing rock amplitudes and frequencies calculated by using the method are generally in good agreement with available experimental data. The results verify that wing rock is caused by hysteretic deflections of the vortices and indicate that the stabilizing moments that limit wing rock amplitudes are the result of the one primary vortex moving outboard of the wing where it has little influence on the wing.Gainer, Thomas G.Langley Research CenterWING ROCK; VORTICES; FLOW DISTRIBUTION; DYNAMIC STABILITY; DELTA WINGS; STABILIZATION; SWEPT WINGS; HYSTERESIS; FLOW VELOCITY; DEFLECTION; CONICAL FLOW; BOUNDARY CONDITIONS; ANALOGIES...
Author | : Akbar Sultan |
Publisher | : |
Total Pages | : 276 |
Release | : 1997 |
Genre | : Aerodynamics |
ISBN | : |
Download A 3-D Vortex Lattice Study of Delta Wings with and Without Dihedral and Twist Book in PDF, Epub and Kindle
Author | : Y. W. Jun |
Publisher | : |
Total Pages | : 9 |
Release | : 1987 |
Genre | : |
ISBN | : |
Download Leading Edge Vortex Dynamics on a Delta Wing Undergoing a Wing Rock Motion Book in PDF, Epub and Kindle
Author | : Sutthiphong Srigrarom |
Publisher | : |
Total Pages | : 610 |
Release | : 2001 |
Genre | : Vortex-motion |
ISBN | : |
Download On the Formation of Vortex Breakdown Over Delta Wings Book in PDF, Epub and Kindle
Author | : Matthew S. Menke |
Publisher | : |
Total Pages | : 182 |
Release | : 1996 |
Genre | : |
ISBN | : |
Download An Experimental Study of the Unsteady Nature of Vortex Breakdown Over Delta Wings Book in PDF, Epub and Kindle
Author | : P.-M. Hartwich |
Publisher | : |
Total Pages | : |
Release | : 1989 |
Genre | : |
ISBN | : |
Download Numerical Study of the Vortex Burst Phenomenon for Delta Wings Book in PDF, Epub and Kindle
Author | : K. T. Lee |
Publisher | : |
Total Pages | : 178 |
Release | : 1990 |
Genre | : Airplanes |
ISBN | : |
Download Controlled Vortical Flow on Delta Wings Through Unsteady Leading Edge Blowing Book in PDF, Epub and Kindle
Author | : John M. Kuhlman |
Publisher | : |
Total Pages | : 72 |
Release | : 1978 |
Genre | : Airplanes |
ISBN | : |
Download Analytical Studies of Separated Vortex Flow on Highly Swept Wings Book in PDF, Epub and Kindle