某单缸柴油机排气消声器的结构优化分析  

Structural Optimization Analysis of the Exhaust Mufflers of Single Cylinder Diesel Engines

作　　者：丁瑞 李舜酩[1] DING Rui;LI Shunming(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]南京航空航天大学能源与动力学院,南京210016

出　　处：《噪声与振动控制》2021年第2期212-218,共7页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(51675262);预研领域基金课题资助项目(6140210020102);国家重点研究和发展资助项目(2016YFD0700800)。

摘　　要：针对单缸柴油机排气消声器在中低频段消声效果不理想的问题,提出一种新的消声器结构优化方案。首先,利用Virtual. Lab和Fluent软件进行消声器声学优化以及流场优化。然后对两种消声器动力性能进行对比分析,并通过功率损失试验和插入损失试验对比分析优化前后的消声器。仿真结果表明,优化后的消声器在中低频段消声效果优于原消声器,且内部平均温度比原消声器有所降低。试验结果表明,在典型扭矩点和功率点噪声分别降低约4.0dB和3.6 dB,均降低明显。优化后的消声器在不同转速工况下插入损失提升效果均十分显著,但功率损失率仍在允许范围内,这证明了新消声器结构的可行性。To solve the problem that the mufflers have no ideal sound elimination effect in middle and low frequency bands,a new structural optimization scheme for exhaust mufflers of single cylinder diesel engines was proposed.Firstly,Virtual.Lab and Fluent codes were used to conduct acoustic optimization and flow field optimization of mufflers.Then,two kinds of mufflers are comparatively analyzed in terms of dynamic performance,and the power loss test and insertion loss test were carried out to compare and analyze the mufflers before and after the optimization.The simulation results show that the optimized mufflers are superior to the original mufflers in the middle and low frequency bands,and the internal average temperature is lower than that of the original muffler.The test results show that the noise is reduced by about 4.0 dB and 3.6 dB respectively at the typical torque point and power point.The insertion loss of the optimized muffler at different speeds is raised obviously,and the power loss rate is within the allowable range,which proves the feasibility of the new muffler structures.

关 键 词：声学 单缸柴油机 消声器 消声性能 结构优化 

分 类 号：TK413.47[动力工程及工程热物理—动力机械及工程]