对转螺旋桨流场和声场数值模拟研究

Research on numerical simulation of flow field and sound field of counter-rotating propeller

采用非线性谐波法耦合FW-H方程的混合噪声数值模拟方法,对某11×9的对转螺旋桨模型的气动力与噪声开展了数值模拟研究。结果表明:在起飞阶段,与单转子螺旋桨相比,对转螺旋桨的主要噪声源是由前排螺旋桨产生的叶尖涡、前缘涡和尾迹涡等涡系与后排螺旋桨相互作用产生的干涉噪声,后排螺旋桨上的非定常压力波动是干涉噪声的主要贡献源;在干涉噪声频率处,前排螺旋桨的噪声主要向下游辐射,后排螺旋桨的噪声主要向上游辐射。此外,还研究了不同积分面对对转螺旋桨噪声计算结果的影响。相比于固体壁面FW-H积分面,可穿透FW-H积分面的计算结果更接近试验数据,但是不同的积分面对转子单独噪声基本没有影响;上游积分面的变化对对转螺旋桨的噪声影响很小,但是下游积分面的变化对干涉噪声影响较大。

The hybrid noise numerical simulation method of nonlinear harmonic method coupled with FW-H equation was used to study the aerodynamic force and noise of a 11×9 counter-rotating propeller model.The results of the study showed that:during the takeoff phase,the main noise source of the counter-rotating propeller was the interference noise generated by the interaction of the vortex systems such as the blade tip vortex,leading edge vortex and trailing vortex generated by the front propeller with the rear propeller,and the non-constant pressure fluctuation on the rear propeller was the main contributor to the interference noise.At the frequencies where interference noise appeared,the noise of the front propeller radiated mainly downstream,and the noise of the rear propeller radiated mainly upstream.Compared with the solid FW-H surface,the calculation results of the porous FW-H surface were closer to the experimental data.Different integration surfaces had little effect on the noise of the counter-rotating propeller,but the variation of the downstream integration surface had a greater effect on the interference noise.