压缩机消声器消声特性的数值模拟及结构优化

Numerical Simulation and Structure Optimization of Compressor Muffler

通常平面波理论无法准确地预测复杂结构消声器内部的声场分布,为了提高复杂结构压缩机消声器的消声特性,对其进行了数值模拟。在基本假设的前提下,施加合理的进出口及壁面边界条件,利用ANSYS软件建立消声器内部声场的三维有限元模型,SYSNOISE软件计算消声器内部声场的声压分布以及传递损失。然后,研究了不同的结构参数(隔板位置、内插管位置、进口管位置)对消声器的传递损失的影响,根据分析结果和压缩机的噪声特点,优化了消声器的结构参数,有效地提高了消声器的消声性能,为复杂结构消声器的设计提供了参考依据。

The inner field of complicated structural muffler couldn＇t be predicted accurately by plane wave theory. A numerical analysis method was suggested to simulate the inner field of muffler for improving the acoustic characteristic. At first, based on the basic assumptions, reasonable boundary conditions were applied appropriately, which included inlet, outlet and wall boundary conditions. Then three dimensional finite element model of muffler was modeled by ANSYS, and pressure-distribution and transmission loss were calculated by SYSNOISE. Next, a number of effects were studied, including the positions of rigid baffle in the chamber; the positions of extended tube; the positions of inlet tube. According to the analysis results and noise characteristic of compressor, structural parameters were optimized. Finally, the acoustic performance of muffler was improved efficiently. This method is feasible, which provides the references for design of mufflers.