Vortex Core Size in the Rotor Near-Wake

作者: Larry A. Young

DOI:

关键词:

摘要: Abstract Using a kinetic energy conservation approach, number of simple analytic expressions are derived for estimating the core size tip vortices in near-wake rotors hover and axial-flow flight. The influence thrust, induced power losses, advance ratio, vortex structure on rotor is assessed. Experimental data from literature compared to analytical results this paper. In general, three conclusions can be drawn work First, greater larger near-wake. Second, more efficient with respect smaller resulting size. Third, lastly, initially decreases low ratios, but large ratios asymptotically increases nominal upper limit. Insights gained should enable improved modeling rotary-wing aerodynamics, as well provide framework experimental investigations advanced propeller wakes.

参考文章(18)
J.G. Leishman, A.J. Coyne, Y.O. Han, On the Turbulent Structure of a Tip Vortex Generated by a Rotor AHS International Forum 52. ,(1996)
Jeffrey S. Light, Alexandra A. Swanson, Shadowgraph flow visualization of isolated tiltrotor and rotor/wing wakes AHS International Forum 48. ,(1992)
B.M.J. Beesten, U. Seelhorst, K.A. Bütefisch, Flow Field Investigation of a Rotating Helicopter Rotor Blade by Three-Component Laser-Doppler-Velocimetry Canada Communication Group, ISBN 92-836-0015-0. ,(1995)
John Gordon, Ramasamy, Leishman, Shreyas, Manikandan, Ananthan, The Role of Filament Stretching in the Free-Vortex Modeling of Rotor Wakes AHS International Forum 58. ,(2002)
Edwin W. Aiken, James T. Heineck, Chee Tung, Kenneth W. McAlister, Forced Diffusion of Trailing Vorticity from a Hovering Rotor AHS International Forum 57. ,(2001)
J. Gordon Leishman, Preston B. Martin, Trailing Vortex Measurements in the Wake of a Hovering Rotor Blade with Various Tip Shapes AHS International Forum 58. ,(2003)