悬停旋翼的约束尾迹分析

THE CONSTRAINT WAKE ANALYSIS FOR HOVERING ROTORS

本文把约束尾迹分析的设想实施于悬停情形而发展出悬停旋翼的约束尾迹分析法(CWAHR),其中引用了升力线理论,“自守尾迹”假设及加速畸变格式,并从预定尾迹方程中导出尾迹边界的双段指数律为几何约束条件。CWAHR收敛性好,简便易行,既节省工作量又能达到较高精度,进一步完善后可成为直升机旋翼悬停载荷、流场及性能分析计算的通用方法。

The concept of the constraint wake analysis is applied to hovering helicopter rotors, which leads to the development of the Constraint Wake Analysis for Hovering Rotors (CWAHR).The CWAHR is characterized by a lifting line vortex system, a self-persevering hover wake model, an accelerated distorting formula and a dual-exponential relation of the wake boundary which is derived from the prescribed wake equations and taken as a geometrical constraint of the procedure.The CWAHR shows higher accuracy when compared with other data sources, and a high convergent speed. It's believed that the CWAHR will be applicable for all rotor design geometries when further modifications are included.