一种计算螺旋桨性能的高效升力线法

本文提供了一种能有效计算螺旋桨性能的方法。方法的特点在于:(1)边界条件中利用了中弧面上的局部斜率以代替平面边界条件,使本方法适用于具有较大弯度翼型的螺旋桨;(2)用近似解析式与数值积分结合起来计算螺旋形尾涡产生的诱导速度,在保证精度的条件下,使计算工作量降低到原有的 10 %;(3)利用翼型的升阻特性考虑翼型阻力及压缩性影响。利用本方法对某型飞机的螺旋桨进行了计算,并与实验数据作了比较,在进距比不太小的情况下,计算结果与实验数据符合很好。 

EFFICIENT LIFTING LINE METHOD FOR COMPUTING PERFORMANCE OF PROPELLER

An efficient lifting line method has been developed for computing the performance of propeller.The present method features:1.The local gradient on the mean camber surface is used as a boundary condition instead of plane boundary condition so as to make the method applicable for propellers with large camber airfoil;2.A very good approximation of the velocities induced by semi infinite helical vortex lines is obtained by a combination of direct numerical integration of the exact integrand and exact analytical integration of its enveloped functions,so that the required computing time is reduced to only about 10% of the original one;3.The effects of blade section drag and compressibility have been considered in the computation of the propeller performance comparison of analytical and experimental results for a propeller are presented.It demonstrates the validity of the computational results,when the advance ratio is not too small.