基于CFD方法的旁支型消声器性能分析

基于计算流体力学方法,综合考虑声学和流体动力学特性,对旁支型消声器进行性能分析。运用一维CFD软件GT-power计算了两种旁支型消声器具有不同插入长度时的传递损失,并对其结果进行了对比分析;利用三维CFD软件FLUENT对其流场特性进行数值模拟,计算得到了各模型的压力损失曲线,并对其影响因素进行了分析,仿真还得到了消声器腔内流速和湍动能的分布,进一步分析了其流动特性,并结合声学性能和流体动力学特性得到两种较好的结构布置,从而为消声器的设计优化提供了依据。

Performance analysis of muffler with vertical inlet/outlet based on CFD

Based on the method of computational fluid dynamics,the performances of mufflers with vertical inlet/outlet were analyzed by taking into account of acoustic and aerodynamic characteristics.First,the transmission loss of vertical inlet/outlet mufflers with various insert lengths was calculated with the one-dimensional CFD software GT-power and the results were compared and analyzed;three-dimensional CFD software FLUENT was also applied to accomplish the numeric simulation of flow field characteristics in order to calculate the pressure loss curve of various models and analyze other affecting factors.It was also obtained the distributions of velocity and turbulent kinetic energy of the in the muffler chamber through simulation.Its flow characteristics were further analyzed and the two better structural configurations were picked out from the models discussed in this paper based on the comprehensive analysis of acoustic and aerodynamic characteristics.Thus,the analytical results can provide a foundation for design and optimization of the mufflers.