压缩机吸气消声器的声学和阻力特性研究

Research on Acoustic and Resistance Characteristics of Compressor Suction Mufflers

吸气消声器主要用于减弱制冷剂吸入压缩部分时产生的进气噪声。针对目前用于往复式压缩机吸气消声器消声频带窄、中高频消声效果不佳的特点,设计出一种多腔室组合的消声器,可综合考虑消声器的声学性能和流体性能。在Pro/E中建模完成后,将模型导入ANSYS ICEM CFD中划分网格,在声学仿真软件中分别对最初的和新设计后的消声器进行声学仿真。比较两种消声器的传递损失,数值仿真结果显示,新设计的消声器低频消声效果有所降低,中高频消声效果良好,整体消声量提高。最后在Fluent中对消声器的流体性能进行仿真,以压力损失作为衡量流体性能的标准,得出在设计消声器时不能为了提高声学性能设计过多腔室的结论。

Suction muffler is mainly used to attenuate the intake noise generated when the refrigerant is sucked into the compressive part. Aiming at the characteristics of narrow muffler band and poor sound elimination effect in low and mid frequency ranges of the reciprocating compressor suction muffler, a multi-chamber combined muffler is designed which can consider the acoustic performance and fluid characteristics of muffler simultaneously. After the modeling in Pro / E is completed, the model is imported into the ANSYS ICEM CFD for meshing, and acoustic simulations of the original and newly designed mufflers are performed respectively in LMS. Virtual. Lab. The transmission losses of the two mufflers are compared. The numerical simulation results show that the newly designed muffler has a lower muffler effect in low frequency range, but has better muffler effects in middle and high frequency ranges and an overall muffler volume increase. Finally, the fluid performance of the muffler is simulated in Fluent code. Using the pressure loss as an index for fluid performance evaluation, it is concluded that using multi-cavity may not be suitable in the mufflers design to improve the acoustic performance.