| 摘要: |
| 基于热声学理论，本文从阻抗匹配的角度，研究了Vuilleumier（VM）型热压缩机匹配负载阻抗的输出特性，揭示热压缩机输出压比、输出声功和效率随负载阻抗的变化，分析热压缩机与所接负载阻抗之间的匹配关系。采用Sage软件进行计算，对两种不同回热器直径下热压缩机的输出特性进行对比，热压缩机输出阻抗幅值为4×10-8~4×10-9 (Pa?s)/m3，阻抗相角为﹣60°~60°。计算结果表明：热压缩机输出声功、压比和效率随着阻抗幅值和阻抗相角的变化而显著变化:阻抗成容性负载时阻抗幅值对输出声功的影响较明显；不同阻抗相角时，阻抗幅值对热压缩机输出压比的影响均较明显；效率随阻抗幅值和相角的变化均很明显。但热压缩机输出的声功、压比和热效率不一定在同一阻抗下同时达到最优值，因此匹配设计热压缩机驱动的低温级制冷机时，应综合输出声功、压比以及效率选定合适的阻抗幅值和相角。从输出声功和压比的角度，当前两种直径的热压缩机回热器，直径为30 mm时的性能优于直径为40 mm。 |
| 关键词: 输出特性 数值模拟 热压缩机 负载阻抗 |
| DOI： |
| 投稿时间：2018-09-13 修订日期：2018-12-29
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| 基金项目:国家自然科学基金（51376187）资助项目。 |
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| Output Characteristics of a Vuilleumier-type Thermal Compressor |
|
Wang Yanan1,2, Cui Yunhao1,2, Dai Wei1,2, Wang Xiaotao1,2, Luo Ercang1,2
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| (1.Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;2.University of Chinese Academy of Sciences) |
| Abstract: |
| In this study, the thermoacoustics theory is used to study the output characteristic of a Vuilleumier (VM)-type thermal compressor from the perspective of impedance matching, showing the trend of the output pressure ratio, acoustic power, and efficiency of the thermal compressor on load impedance. The matching relationship between the thermal compressor and load is also analyzed. The program Sage is used to calculate the output characteristics of thermal compressors with two different diameter regenerators. The impedance amplitude for the thermal compressor varies from 4×10-8 to 4×10-9 (Pa?s)/m3 and the phase angle changes between ﹣60° and 60°. The calculation results show that the output pressure ratio, acoustic power, and efficiency for the thermal compressor significantly change with the change in impedance amplitude and phase angle: the impedance amplitude has a significant influence on the output acoustic power when the impedance is capacitive and the influence of the impedance amplitude on the output pressure ratio for the thermal compressor is obvious. Both the impedance amplitude and angle have significant influences on the efficiency. However, the acoustic power, pressure ratio, and efficiency of the thermal compressor cannot simultaneously reach the optimal value at the same impedance. Therefore, it is necessary to comprehensively estimate the acoustic power, pressure ratio, and efficiency of the thermal compressor when matching the design of the low-temperature stage load. From the perspective of the output pressure ratio and acoustic power, the performance of the thermal compressor regenerator with diameter 30 mmis better than that with diameter 40 mm. |
| Key words: output characteristic numerical simulation thermal compressor load impedance |
