摘要
在具有环路结构的行波热声发动机中引入可诱导时均压降的喷射泵是一种抑制Gedeon声直流以提高热效率的有效方式。本文对交变流场中喷射泵诱导时均压降的性能开展了实验研究,着重分析了管道截面积与喷射泵小截面面积比在12.5～31.4的范围内,改变喷射泵的大小截面面积比的影响。实验结果显示,当喷射泵的大小截面面积比小于2.3时,增大喷射泵的大小截面面积比有利于增大喷射泵诱导的时均压降,同时降低总声功损失。分析表明,这主要是由于沿喷射泵流道扩展方向流动的阻力系数明显降低所导致的。
Introducing a jet pump to induce a time-averaged pressure drop is one of the effective ways to suppress Gedeon streaming in the loop configuration and thereby increase the thermal efficiency of the traveling-wave thermoacoustic engine. In this paper, the time-averaged pressure drop induced by a jet pump in oscillatory flow was experimental measured. The emphasis was focused on the effect of big-to-small opening area ratio on the performance of jet pump with the pipe-to-small opening cross sectional area ratio in the range of 12.5 to 31.4. The experimental results show that the time-averaged pressure drop increases and the acoustic power loss decreases with a rise in big-to-small opening area ratio of jet pump when it is less than 2.3. This is mainly due to the apparent decrease in the resistance coefficient of the flow in the diverging direction.
作者
封叶
汤珂
金滔
FENG Ye;TANG Ke;JIN Tao(Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province,Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第11期2356-2361,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51376158
No.51576170)
国家重点基础研究发展计划项目(No.613322)
关键词
热声发动机
喷射泵
Gedeon声直流
交变流动
时均压降
thermoacoustic engine
jet pump
Gedeon streaming
oscillatory flow
time-averaged pressure drop
