计及气流影响的小长径比插入管消声器声学特性的实验研究  

Effect of air flow on acoustic characteristics of an insert pipe muffler with a small length-to-diameter radio

作　　者：杜江[1] 欧阳华[1] 杜朝辉[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《振动与冲击》2010年第5期166-170,共5页Journal of Vibration and Shock

基　　金：航空科学基金项目(2007ZB57003);上海市青年科技启明星计划(08QA14038)

摘　　要：在管内平均气流流速10 m/s^100 m/s范围内,对长径比L/D=0.6的插入管型抗性消声器内部和外部声学特性进行了实验研究。探讨了气流流速大小和消声器结构参数的变化对插入管消声器声学特性的影响,并结合腔内气流涡模态和尾管声学模态对小长径比插入管消声器的声学特性机理进行了分析。实验及理论分析表明,气流流速对消声器内外声学特性均有明显的影响。与消声器静态特性不同的是,在有气流情况下必须计及腔体内上游插入管气流喷射引发的涡模态。计及气流影响的小长径比插入管消声器声学特性与消声器腔内气流再生噪声的涡模态和消声器尾管的声学模态关系密切,而与消声器空腔本体声学模态无关。The experimental study was carried out on the acoustic characteristics at both inside and outside of an insert pipe muffler with length-to-diameter ratio L/D of 0.60 under the inside air flow velocity from 10m/s to 100m/s.The effects of air velocity and structural parameters on the acoustic characteristics of the muffler were studied.The acoustic characteristic mechanism of the insert pipe muffler with a small length-to-diameter ratio was also analyzed according to the vortex mode in the muffler and the acoustic mode of the tail pipe.It was found that the acoustic characteristics at both inside and outside of the muffler are influenced heavily by the air velocity;the difference from the acoustic characteristics of the muffler without air flow is that the effect of the vortex mode generated by the jet flow of upstream inlet pipe in the muffler has to be taken in the study on acoustic characteristics of muffler with air flow;the acoustic characteristics of the insert pipe muffler with a small length-to-diameter ratio are closely related with the vortex mode of air regeneration noise in the muffler and the acoustic mode of the tail pipe.

关 键 词：插入管型消声器 气流再生噪声 声学模态 

分 类 号：TB535.2[理学—物理]