制冷压缩机汽缸盖气动噪声仿真分析与优化设计

Simulation analysis and optimization design of aerodynamic noise in the cylinder head of refrigeration compressor

采用ANSYS和声学仿真软件对某型号变频压缩机的汽缸盖部件进行流场和声场仿真,优化汽缸盖结构降低噪声,并加工样品进行实验测试。研究表明:新汽缸盖比原汽缸盖动压最高下降9.12%,流速最高下降4.58%,湍流强度最高下降18.24%,且第二流道位置无峰值。气动噪声和辐射声场仿真全频段各监测点声压级都有不同程度下降。单机噪声实验测试,新汽缸盖噪声在全转速有明显下降,降幅最大的转速是3900 r/min降低6.1%,通过频谱分析发现是4000~5000 Hz频段内声压级降低导致噪声降低。

Uses ANSYS and acoustic simulation software to simulate the flow and sound fields of the cylinder head components of a certain type of inverter compressor,optimize the cylinder head structure to reduce noise,and process samples for experimental testing.Research shows that the new cylinder head has a maximum decrease of 9.12%in dynamic pressure,4.58%in flow rate,and 18.24%in turbulence intensity compared to the original cylinder head.There is no peak at the second channel position.The simulation of aerodynamic noise and the simulation of radiated sound field show varying degrees of decrease in sound pressure levels at various monitoring points in the full frequency band.Comparing the experimental noise tests of the compressor,it is found that the noise of the new cylinder head decreased significantly at full speed,with the maximum decrease being a 6.1%decrease at 3900 r/min.Through spectrum analysis,it is found that the sound pressure level in the 4000~5000 Hz frequency band decreased,resulting in a decrease in noise.