锯齿形翅片对喷管流动及噪声特性的影响分析

摘要

Lighthill theory showed that jet noise will change as the shape of the nozzle changed. Conical nozzle and chevron nozzle were designed based on engine exhaust system. The relevant jet flow models were established. Flow analysis and noise prediction of the two kinds of nozzle were carried out with numerical simulation method. Numerical simulation showed that the new nozzles will bring some noise suppression.%喷注噪声理论表明,改变喷口形状会使喷注噪声发生改变.针对发动机排气系统,设计了锥型啧管及锯齿形出口的锥形喷管,建立相应的喷注射流模型,利用数值手段对2种喷管进行啧注流场分析和噪声预测,研究锯齿形翅片对流动和噪声特性带来的影响.