涡轮增压器出口消声器的性能预测和评估  

Prediction and evaluation of acoustic performance of silencer for turbocharger outlet

作　　者：刘联鋆[1] 郝志勇[1] 钱欣怡[1] 胡先锋[1] 

机构地区：[1]浙江大学能源工程系,浙江杭州310027

出　　处：《哈尔滨工程大学学报》2013年第2期197-201,共5页Journal of Harbin Engineering University

摘　　要：为了更加有效地预测和评估某涡轮增压器出口消声器的消声性能,首先采用三维CFD法计算该消声器在无流条件下的消声量,用实验测量结果验证CFD模型的可靠性.进一步用CFD法计算了消声器有平均流时的传递损失,以便直观地分析消声器的声学性能,发现随着平均流马赫数和温度的提高,传递损失高值区间向高频区域移动.在发动机台架上测量了增压器低转速工况下消声器的插入损失,对比CFD方法计算的传递损失,评估了消声器在此工况下的消声特性.最后用CFD方法预估了消声器在发动机实际工况下的消声性能.In order to predict and evaluate the noise attenuation performance of a silencer connecting with the tufl^ocharg- er compressor outlet, a research study was conducted. Firstly, a Three Dimensional （3-D） Computational Fluid Dynamic （CFD） approach was adopted to calculate the noise reduction of the silencer under the condition of without flow. The re- liability of CFD model was validated by the measured result. Furttler, transmission loss of the silencer, in the study of mean flow, was calculated by the CFD approach, so to analyze its acoustic performance in a straightforward manner. It was discovered that high value zone of transmission loss shifted to higher frequencies following the increase of the Mach numhers and temperature of the mean flow. The insertion loss of the silencer was also measured on an engine test rig un- der the behavior of low rotation speed of the turbocharger. In comparison with the transfer loss calculated by CFD meth- od, the noise attenuation performance of the silencer was evaluated under these operating conditions. At last, the CFD approach was used to predict the noise attenuation performance of the silencer under real conditions of engine.

关 键 词：增压器 消声器 CFD法 平均流 传递损失 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]