共振式消声器声学性能三维时域计算及分析  

Acoustic Performance Analysis of Resonant Muffler based on Three-dimensional Time-domain Computation

作　　者：田赛龙 毕凤荣[2] 景亚兵[2,3] 姚昱儒 杨晓[2] 刘建飞[2] 

机构地区：[1]天津大学机械工程学院,天津300072 [2]天津大学内燃机燃烧学国家重点实验室,天津300072 [3]天津大学内燃机研究所,天津300072

出　　处：《机械科学与技术》2017年第5期665-669,共5页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家科技支撑计划项目(2015BAF07B04)资助

摘　　要：共振式消声器是改善进排气噪声的重要措施。基于计算流体动力学(CFD)的方法对共振式消声器声学特性进行计算,并通过有限元技术验证了模型与计算结果的准确性。研究流速及温度变化对共振式消声器传递损失的影响规律,结果表明:随流速增加,共振频率处峰值减小,通过频率处传递损失逐渐接近共振峰峰值,消声器频率特性向高频移动,整体消声量下降;随温度增加,共振频率向高频移动,峰值减小,带宽增加;流速、温度对低频处传递损失的影响大于高频。The resonant muffler is an important measure to improve the intake and exhaust noise. The interactionbetween the flow and the sound is significant. The acoustic performance of resonant muffler was calculated with thethree-dimensional time domain impulse method, which is based on the computational fluid dynamics （CFD）simulation. The CFD simulation results were verified by experimental results. The acoustic performances varyingwith different flow rates and temperature were analyzed. The results show that the peak at the resonance frequencydeclines and the transmission loss at the pass frequency moves gradually close to the resonance peak along with theincreasing flow rate. Besides, the frequency characteristics shift to the higher frequency and the overall noisereduction effect declines. The resonance frequency shifts to the higher frequency, and the peak decreases with thetemperature increase. Both the flow and temperature has more obvious effect on low frequency transmission loss thanhigh frequency.

关 键 词：计算流体力学 消声器 传递损失 流速 温度 

分 类 号：TB535.2[理学—物理]