离心压气机非定常流动频域特性  

CHARACTERISTICS OF UNSTEADY FLOW IN FREQUENCY DOMAIN IN A CENTRIFUGAL COMPRESSOR

作　　者：祁明旭[1] 原野[1] 马朝臣[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《工程热物理学报》2009年第9期1475-1478,共4页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.50676011)

摘　　要：以涡轮增压器56mm离心压气机为研究对象,采用定常流动求解方法,对其三种不同转速下的工作特性进行了预测并与实验进行了对比分析;应用相延迟方法,对高转速近失速点工况下压气机内部的三维非定常流动进行了数值模拟及频谱分析,对叶轮流道、无叶扩压器以及蜗壳内的流动频谱特性进行了初步分析。频域分析表明,对于本文所研究的离心压气机,非定常脉动特性主要表现在叶轮流道中,是诱发压气机气动噪声的主要因素,而在蜗壳内,非定常脉动特性显著减弱。Performances prediction using steady RANS solver and validation are performed on a 56 mm turbocharger compressor under three working speed-line in this paper. Unsteady flow simulation in near-surge condition at a high rotation speed is then carried out and frequency-amplitude characteristics in an impeller, vaneless diffuser and volute are studied. Results show that unsteady effect lies mainly in an impeller and is the main reason for inducing aero-acoustics in a centrifugal compressor, while in the volute, unsteady effects decrease significantly and has less contribution to acoustics level.

关 键 词：非定常 频域 气动噪声 

分 类 号：TK413.5[动力工程及工程热物理—动力机械及工程]