基于VVPM/CA耦合的旋翼非定常载荷计算

Unsteady Load Calculation for Rotor Based on VVPM/CA Coupling

为了提高旋翼非定常载荷计算精度,将基于黏性涡粒子方法(Viscous vortex particle method,VVPM)的尾迹计算引入至旋翼综合分析(Comprehensive analysis,CA)中,建立了一个新的旋翼VVPM/CA耦合计算模型。该模型中,旋翼VVPM基于第一性原理,可模拟尾迹的畸变和扩散而不引入经验参数,而旋翼CA则可以有效地进行桨叶弹性变形及非定常载荷计算,通过采用松耦合策略,可以高效地实现两者的信息交换。在此基础上,以SA349/2直升机为算例,针对其低速和高速两种典型前飞状态进行了深入分析,计算表明,本文建立的VVPM/CA耦合分析可以有效地预测旋翼尾迹形状及非定常载荷。

In order to improve the accuracy of rotor unsteady load calculation, a viscous vortex particle method （VVPM） based wake simulation is integrated into the rotor comprehensive analysis （CA） module, then a new coupled method is established. In this model, the first principle based VVPM is capable of simulating the wake distortion and diffusion without any empirical parameter, while the rotor CA is able to calculate the elastic deformation and unsteady loads of rotor blade effectively. And through the loose coupling strategy, the information can be efficiently exchanged between two modules. Based on the developed method, the SA349/2 helicopter is chosen to be tested, and two traditional flight regimes are investigated thoroughly. The result shows that the VVPM/CA coupled analysis can predict the wake geometry and unsteady loads accurately.