几何参数对组合式推进器流噪声水平的影响

摘要

在组合式推进器相同水动力性能的设计前提下,采用数值模拟的方法针对不同设计方案流噪声水平进行了计算.宽带噪声采用Proudman声功率模型及Lilley提出的AALS模型计算,线谱噪声采用径向脉动力幅值衡量,比较了不同方案不同几何参数下的噪声,并在此基础上总结出主要几何参数与噪声水平之间的关系.本文研究成果对进一步进行组合式推进器声学设计具有重要指导意义.%Based on the same hydrodynamics performance of combined propeller systems, the flow induced noise pressure level of different cases are computed with numerical simulation. Proudman's sound power model and Lilley's AALS model are used for broad band noise computation and breadth of radial fluctuation force are used for discrete frequency computation. Flow induced noise of combined propeller systems with different geometrical parameters are compared, and the relationship between geometrical parameters and noise is gained.