摘要
可诱导非对称压降的喷射泵被引入热声发动机的环路结构中,可以用于抑制Gedeon流,进而提高热声发动机热效率。针对Swift对喷射泵提供时均非对称压降的理论推导结论与Idelchik等人报道的实验结果之间存在的矛盾,本文利用计算流体力学软件,研究了喷射泵的厚径比l/d_e对时均非对称压降的影响情况。结果表明,改变厚径比l/d_e会引起时均非对称压降方向的变化,在喷射泵设计中,除了应该考虑喷射泵流道两端面积不相同所带来的影响,还必须合理选择其厚径比l/d_e。
Gedeon streaming,which may considerably deteriorate the thermal efficiency of a traveling-wave thermoacoustic engine,can be suppressed by inducing a jet pump into the loop configuration.The contradiction of the time-averaged pressure drop between Swift＇s theoretical derivation and Idelchik＇s experimental results,motivated us to study the effect of the jet pump＇s thickness-to-diameter ratiol/de on the time-averaged asymmetric pressure drop by means of computational fluid dynamics.The results indicate the variation in thickness-to-diameter ratiol/de can change the direction of the time-averaged pressure drop induced by the jet pump,consequently,the designing of a jet pump needs to focus not only on the asymmetry of opening areas of both ends,but also on the thickness-to-diameter ratio l/de.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第12期2562-2566,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51376158
No.51276154)
关键词
喷射泵
Gedeon流
交变流动
非对称压降
jet pump
gedeon streaming
oscillating flow
time-averaged pressure drop
