消声器内部流场及温度场的数值分析

Numerical Analysis of the Flow Field and Temperature Field Inside the Muffler

对一典型结构消声器的内部流场及温度场进行了数值模拟研究,并就消声器内部气流速度、温度变化对消声性能的影响进行了分析。消声器设计应遵循以下原则:穿孔管小孔总的流通面积应大于排气管口的面积;应充分利用气流与声波流的逆向作用来提高消声效果;消声器入口段应尽量采用均匀过渡结构;出口直径不宜过小。

The flow field and temperature field inside a typicallystructured muffler were studied by numerical simulation, and the effect of the flow velocity and temperature on the performance of the muffler was analyzed. The analysis of the flow field and temperature field proves that the following principles should be taken into account in muffler design: the total flow area of the holes in the perforated pipe should be larger than the cross sectional area of the exhaust pipe; taking full advantage of the converse function between the air flow and the sound wave motion can improve the anechoic performance; uniform transition structure at the entrance part of the muffler is suggested to decrease the pressure loss; the diameter of the tail pipe should not be too small.