Acoustic power measurement of linear compressors. (December 2018)

• Record Type: Journal Article
• Authors: Chao, Yijun; Zhao, Qinyu; Guo, Yongxiang; Wang, Bo; Xiong, Chao; Li, Haiying; Gan, Zhihua
• Is Part Of: Cryogenics. Volume 96(2018)
• Page Start: 10
• Page End: 17
• Publication Date: 2018-12
• Subjects: Linear compressor -- Acoustic power -- Efficiency -- RC load -- Volume flow; Low temperature engineering -- Periodicals; Low temperature research -- Periodicals; 536.56
• DOI: 10.1016/j.cryogenics.2018.09.011
• Languages: English
• ISSNs: 0011-2275

Abstract

Highlights: RC load and back chamber approach are used to measure acoustic power ofcompressors. Measurement results have a good consistency with theoretical calculation. Difference between the two approaches are analyzed. Optimum impedance and the impedance cloudy map can be obtained by RC load approach. Abstract: The linear compressor works as an important driver for high frequency regenerative cryocoolers. The acoustic power output of the compressor is a critical parameter in the design and the optimization of a linear compressor. To measure this parameter, several approaches based on different theories have been developed. In this paper, the RC load approach and the back chamber approach have been applied to a linear compressor to measure the acoustic power output. The results measured by the approaches indicate a good consistency with the theoretical calculation and reveal the connections between different approaches. The difference between the acoustic power at the piston surface and the exit of a linear compressor has been analyzed based on the experimental results from the RC load approach and the back chamber approach. The volume flow rate difference which accounts for the acoustic power difference is studied theoretically. Furthermore, based on the RC load approach, the optimum impedance together with the impedance cloudy map for the linear compressor to reach its highest efficiency has been obtained by analyzing the experimental and the theoretical results.