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近地低速飞行时旋翼尾涡系的畸变及其诱导速度
引用本文:孙茂 Cur.,HCJ.近地低速飞行时旋翼尾涡系的畸变及其诱导速度[J].空气动力学学报,1989,7(1):35-42.
作者姓名:孙茂 Cur.  HCJ
作者单位:北京航空航天大学(孙茂),美国普林斯顿大学(H.C.Curtiss)
摘    要:本文用一简化自由涡模型模拟旋翼尾涡系,用一简单涡模拟地面涡,对近地低速飞行时旋翼尾涡系的畸变及其引起的诱导速度变化作了研究。在地面涡和地面的影响下,桨盘附近的尾涡几何位置发生很大变化,导致桨盘处的诱导速度发生很大变化。尾涡畸变在桨盘处引起的诱导速度变化远远大于地面涡和地面在桨盘处直接产生的诱导速度。考虑尾涡畸变后计算出的诱导速度在桨盘处的分布和实验符合很好。

关 键 词:旋翼  尾涡系  畸变  低速飞行

ROTOR VORTEX WAKE DISTORTION AND ITS INDUCED VELOCITY IN GROUND EFFECT AT LOW SPEED
Sun Mao.ROTOR VORTEX WAKE DISTORTION AND ITS INDUCED VELOCITY IN GROUND EFFECT AT LOW SPEED[J].Acta Aerodynamica Sinica,1989,7(1):35-42.
Authors:Sun Mao
Abstract:The vortex wake and its induced velocity of a helicopter rotor operating near the ground at low forward speeds have been studied using a simplified free wake-ground vortex model.The vortex wake near the rotor plane is distorted significantly because of the flow. field of the ground and ground vortex, resulting in large variation on the induced velocity distribution at the rotor plane,especially near the rotor leading edge.The variation of the induced velocity distribution at the rotor plane caused by the ground and groand vortex through distorting the rotor near-wake is much larger than that induced directly by the ground and ground vortex. The free wake-ground vortex model can be used to predict the induced velocity distribution at the rotor plane With reasonable accuracy.
Keywords:rotor aerodynamics  ground effects  wakes  distortion
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