In this paper,the central work is to calculate and analyze the exhaust noise through changing the shape of the tailing spout,use computational fluid dynamics means by FLUENT to calculate and mesh different models,and compare all the results.In the end,the conclusion is the triangular nozzle model is perfect,it can reduce the noise by 2 ～ 6 dB.%通过简化发动机喷口模型,研究喷管的喷口形状改变后对喷气噪声的影响,针对三种模型,即普通、三角形锯齿以及半圆形锯齿喷管,通过FLUENT软件进行计算分析,并将计算得到的流场以及监测点的声压级进行比较,结果表明,锯齿形尾喷口形状对降低排气噪声较为理想,在最小程度影响出口速度的情况下能减少排气噪声2 ～6 dB.
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