摘要
在热声制冷机声腔结构优化设计问题的研究中,为了获得热声制冷机谐振管内的声腔共振频率,选取圆柱形波导管结构模型,推导了有限长圆柱管内的简正波解析式,计算出驻波型热声制冷机谐振管内部声腔的简正频率与截止频率;采用Ansys有限元仿真软件,运用数值的方法对热声制冷机的谐振声腔进行了自由模态分析,得到了共振频率与模态振型结构,解析解与有限元解吻合较好。用试验方法对热声制冷机的谐振腔进行了声模态提取与制冷效果实验,结果表明:声压传感器拾取得到系统的谐振频率为928Hz,与理论计算的结果相近。在运行频率为928Hz,平均压力为0.1MPa的工况下进行了一系列不同声功率的试验,得到了最大温降为1.9℃,最大温差5.1℃的制冷效果,为今后热声制冷机优化工作提供了参考。
In order to obtain the acoustic resonance frequency of the tube of thermoacoustic refrigerator, cylindrical waveguide model is selected, the calculation formula of normal-mode model of cylindrical tube with a finite length is deduced, and normal frequencies and cut-off frequencies of the cavity inside the resonance tube of the standing- wave thermoacoustic refrigerator are calculated. Based on Ansys software, numerical simulation for the free modal＇ of cavity inside the tube is carried out, the resonance frequencies and mode shapes are obtained, analytical solutions and finite element solutions are in good agreement. Acoustic modal and refrigeration effect of thermoacoustic refrigerator are experimentally extracted, results show that the resonant frequency of the system picked up by the pressure sensor is 928Hz, which is similar with the theoretical calculations. In the operating frequency of 928Hz, the average pres- sure of 0.1MPa, a series of tests of different acoustic power are carried out, the maximum temperature drop reaches 1.9℃, the maximum temperature difference reaches 5.1℃, which provides the reference for the optimization work later on.
出处
《计算机仿真》
CSCD
北大核心
2014年第7期202-207,共6页
Computer Simulation
基金
东南大学水声信号处理教育部重点实验室开放基金(UASP1301)
关键词
热声制冷机
简正波
声模态
数值仿真
实验测试
Tbermoacoustic refrigerator
Normal mode
Acoustic mode
Numerical simulation
Experimental test
