基于VVPM/CA耦合的旋翼非定常载荷计算

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。

Unsteady Load Calculation for Rotor Based on VVPM/CA Coupling

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