叶片厚度对旋涡风机叶片噪声的影响分析  

Influence of blade thickness on regenerative blower's blade noise

作　　者：左曙光[1] 胡清[1] 韩惠君[1] 康强[1] 

机构地区：[1]同济大学新能源汽车工程中心,上海201804

出　　处：《振动与冲击》2014年第8期130-133,147,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(51075302)

摘　　要：利用三维CFD模型对旋涡风机内部流场进行模拟分析,获得叶片表面的压力脉动信息,以叶片表面压力流场作为气动声源,通过求解FW-H方程,计算了叶片产生的远场气动噪声;并以叶片表面的压力脉动信号作为激励源,计算了叶片振动产生的噪声。计算结果表明叶片厚度在1 mm到4 mm的范围,其气动噪声基本保持不变,结构噪声随叶片厚度减小而大幅增加,进一步分析得出叶片产生的噪声以气动噪声为主,结构噪声基本可以忽略。A regenerative blower’s inner flow field was simulated by using a three-dimensional CFD model,and the face dynamic pressure fluctuation of each blade was attained.Then,by solving the FW-H equation the far field aerodynamic noise of each blade was calculated.Taking a blade＇s dynamic pressure as excitation source,the vibration noise radiated by the blade was calculated.The calculation results showed that the aerodynamic noise of a blade keeps from varying when its thickness is within a range of 1 !4 mm;the vibration noise of a blade obviously increase with decrease in its thickness;the noise of a blade is mainly the aerodynamic one,its vibration noise or structural noise can be negligible.

关 键 词：旋涡风机 气动噪声 结构噪声 叶片厚度 

分 类 号：TH445[机械工程—机械制造及自动化]