【摘要】 提出了在直升机空气动力学的某些文献里存在的三个疑点 :( 1 )滑流理论能否用于微观分析 ;( 2 )叶素理论(即使在处理垂直飞行问题时 )中沿半径的诱导速度分布能否认为独立于桨叶安装角分布 ;( 3 )前飞时沿方位角的诱导速度分布究竟如何 ?通过分析讨论 ,本文给出了一些结论。更多还原

【Abstract】 Three doubtful issues occurred in several references of helicopter aerodynamics are pointed out: (1) whether the global momentum theory for helicopter rotors can be applied to the differential analysis; (2) whether the distribution of blade induced velocities along the radius can be assumed to be independent of the blade pitch angle of rotors in blade element theory, even for vertical flight; (3) how does the blade induced velocity distribute over rotor azimuth in forward flight. This paper tries to clarify the doubtful issues and gives some conclusions.更多还原