共轴式直升机飞行性能分析

从总体设计角度，对双旋翼共轴式直升机的悬停和前飞性能计算进行了分析和研究，建立了一套工程实用的计算方法，编制了程序，计算了算例。特别在悬停状态下，根据滑流理论，考虑了双旋翼的相互气动干扰，经过合理的简化、推导和求解，得到了适合不同旋翼间距的悬停性能计算公式。为了验证理论分析的正确性，在旋翼实验台上进行了双旋翼气动特性实验。试验结果表明，上述的分析和计算方法可以较好地满足直升机总体设计要求，并取得了

Analysis on Flight Performance for Coaxial Helicopter

The aerodynamic characteristics of coaxial rotors in hover and forward flights are analyzed from the point of preliminary design; the computation method is found and the performance calculation program is available for the preliminary design. Especially, for the hovering state, momentum theory is applied and after a set of reasonable simplification and analysis, equations which can be used to calculate the performance of coaxial helicopter with different disc displace are obtained. The comparison of the calculation results presented in the paper with the test results on a rotor test stand indicates that the method presented is quite effective for preliminary design for coaxial helicopter.