基于并行计算的消声器三维数值模拟

Three-Dimensional Numerical Simulation of the Muffler Based on Parallel Computing

针对某款汽车复杂消声器建立了三维数值计算模型,采用并行计算技术对该模型进行计算．通过分析数值计算结果,找到该款消声器产生压力损失和再生噪声的主要部位分别是消声器进气内插管开孔处和出气内插管的进口处．据此提出了相应的改进方案．计算结果显示,改进后消声器的背压比原消声器背压大幅度下降,最大可下降20%左右．这种基于计算流体力学理论结合并行数值模拟技术的设计方法,计算一个算例仅需20 min左右,降低了设计周期和设计成本．

A three-dimensional numerical simulation model for some type complicated muffler is put forward, and solved by parallel computing. The analysis of the flow fields shows there are two locations, the plackets on the intake cannulation and the inlet of the exit cannulation, where the pressure loss and regenerated noise are likely to bring. According to the＇ simulation results, the corresponding improved measures are brought forward. it is shown from the simulation results that there is a great decrease of the pressure loss compared with the original muffler, which is about 20%. Owing to the parallel computing, calculating one case needs only about 20 min, which will decrease design period and design cost greatly.