Method for Predicting Rotor Vortex Wake and Downwash Velocity Field

[1] Gray R B. Vortex modeling for rotor aerodynamics[J]. Journal of American Helicopter Society, 1992, 37(1):8~10. [2]Landgrebe A J. The wake geometry of a hovering helicopter rotor and its influence on rotor performance[J]. Journal of American Helicopter Society, 1972, 17(4):3~15. [3]Felker F F,Quackenbush T R,Bliss D B, et al. Comparisons of predicted and measured rotor performance in hover using a new free wake analysis[J]. Vertica, 1990, 14(3):361~383. [4]Lamb H. Hydrodynamics[M]. New York:Dover Publications, 1945.210~241. [5]Samant S S, Gray R B. A semi-empirical correction for the vortex core effect on hovering rotor wake geometries. In:Proceedings of 33rd Annual Forum of American Helicopter Society. Washington D C:American Helicopter Society,1977. [6]Gray R B, Brown G W. A vortex wake analysis of a single-bladed hovering rotor and a comparison with experimental data. AGARD-Cp-111, 1972. [7]Favier D,Mba M N,Barbi C, et al. A free wake analysis for hovering rotors and advancing propellers[J]. Vertica, 1987, 11(3):493~511.