用谐波分析法研究旋翼气动载荷

本文以王适存教授的旋翼涡流理论为根据,把旋翼环量和诱导速度展成Fourier级数,环量沿桨叶展向的分布用分段线性函数表示,推出了以环量为未知数的计算旋翼气动载荷的线性方程组,解决了旋翼涡流理论多年未能解决的实际使用问题。

APPLICATION OF HARMONIC ANALYSIS METHOD TO RESEARCH ON ROTOR AIRLOADS

According to the rotor vortex theory, the rotor circulation and the rotor induced velocity are developed into Fourier series. The circulation distribution along blade spanwise is expressed in Terms of segment-by-segment linear functions. In consequence the induced velocity equations and the circulation equations are derived. The engineering application of the rotor vortex theory is provided. Then the induced velocity and its harmonic components are obtained to provide a quantitative basis for the vortex model. For calculating each order harmonic components of the induced velocity a simplified method is put forward which considers the effects of each order circulation with neglecting those of higher order. The method saves the computer time and is of significant benefit.