为了探讨时域有限体积方法(FVM)在消声器声学性能预测中的应用,采用交错非结构FVM求解线性声波动方程,并进行数值色散分析给出相应的稳定性判据,运用吸收边界条件改进时域脉冲法,并用于预测消声器的声学性能.利用该方法模拟外插管消声器传递损失,结果与商业软件SYSNOISE有限元计算结果、文献实验结果均吻合良好,证明该方法预测抗性消声器声学性能的准确性.分析2种出口管位置蒸汽消声器的声学性能,验证了该方法的正确性及对大网格数模型的良好适用性.%In order to investigate the application of an unstructured finite volume time domain method in the prediction of acoustic attenuation characteristics of mufflers, a linear acoustic wave equation was solved using the finite volume method (FVM) on unstructured staggered-grids. Also, the stability condition was proposed based on dispersion analysis. An improved time domain impulse method based on absorbing a boundary condition was applied to predict the acoustic attenuation characteristics of mufflers. The presented method was used to calculate the transmission loss of an expansion chamber muffler with an extended inlet and outlet. Satisfactory agreement was achieved by the presented method, vibro-acoustic analysis software-SYSNOISE, and the experimental data, which demonstrates the accuracy of this method. The acoustic attenuation characteristics of the two types of complex steam mufflers were analyzed. Comparison with the SYSNOISE (FEM) results shows the ability of presented method on a large grid number.
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