基于GT-Power和CFD的某发动机消声器结构优化与分析

Optimization and Analysis of an Engine Muffler Structure Based on GT-Power and CFD

针对某四缸发动机消声性能在某些工况下不理想的状况,本文通过在GT-Power中建立发动机及消声器耦合模型,同时联合使用CFD仿真,在不增大压力损失的前提下,对其消声器进行了优化。通过对消声器消声扩张比,扩张腔个数及长度,内插管长度的优化改进,提高了消声性能。结果表明:优化后的消声器在260-690Hz范围内,消声量平均提高了7dB,全频率范围内消声量减小了4dB,消声效果明显。

In view of the unsatisfactory performance of the noise reduction performance of a four-cylinder diesel engine under certain working conditions,this paper optimizes its muffler by establishing an engine mode in GT-Power without increasing pressure loss.By optimizing and improving the muffler expansion ratio,number and length of expan-sion cavities,the length of the inner cannula,the muffler performance has been improved.The results show that:in the range of 260-690Hz,the noise reduce 7dB on average,the noise reduction in the full frequency range is 4dB,the effect is obvious.