介质密度对谐振腔声压的影响  

Influence of medium density on the sound pressure of resonator

作　　者：汪建新[1] 王晓明 晋康 王佳微 Wang Jianxin;Wang Xiaoming;Jin Kang;Wang Jiawei(Mechanical and Engineering Institute,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学机械与工程学院,包头014010

出　　处：《低温与超导》2021年第5期9-13,共5页Cryogenics and Superconductivity

基　　金：国家自然科学基金(51365033)资助。

摘　　要：基于热声效应的磁致伸缩换能器热声制冷机,其内部的介质密度对于制冷效率的提高有重要作用。选用改变基础声压来控制谐振腔内介质密度的大小,选取了基础声压0.2—1.0 MPa之间,每0.2 MPa作为间隔,对五种基础声压下1 000—8 000 Hz不同激励下用有限元仿真软件ATILA进行仿真分析,得到趋势是呈现增大的,而且最大值在基础声压和激励频率最大值处,达到了359.97 Pa;在基础压力为0.6 MPa、激励频率为2 000 Hz的条件下谐振腔同时满足驻波形态和高声压。并对整机的模型进行激励频率-辐射板位移输出分析,得到在激励频率为9 000 Hz时,辐射板输出位移最大。随着介质密度的增加,热声制冷机内谐振腔内的驻波形态并没有因此而增加,存在一个同时满足驻波状态和高声压的状态。For thermoacoustic refrigerators with magnetostrictive transducers based on thermoacoustic effect, the density of the medium inside the refrigerators plays an important role in improving the cooling efficiency. Changing based acoustic pressure was chosen to control the size of the resonant cavity medium density, such as based acoustic pressures from 0.2 MPa to 1.0 MPa with every 0.2 MPa as intervals. For the five basic sound pressures under different excitation 1 000—8 000 Hz, ATILA finite element software was used to simulate and analyze.The results show that the increase trend is presented, the maximum value at the maximum sound pressure and excitation frequency reaches 359.97 Pa. Under the condition of 0.6 MPa base pressure and 2 000 Hz excitation frequency, the resonator meets both standing wave shape and high sound pressure. And the model of the whole refrigerator is analyzed by the excitation frequency-radiation plate displacement output. It is found that when the excitation frequency is 9 000 Hz, the radiation plate output displacement is the maximum. With the increase of medium density, the standing wave morphology in the resonant cavity of the thermoacoustic refrigerator does not increase, and there exists a state satisfying both standing wave state and high sound pressure state.

关 键 词：磁致伸缩换能器 基础声压 激励频率 驻波形态 

分 类 号：TB651[一般工业技术—制冷工程]