喷射泵诱导时均非对称压降的机理分析  

Analysis of Time-Averaged Pressure Drop Induced by Jet Pump

作　　者：汤珂[1,2] 封叶[1] 金滔[1,2] 吴云翔[1] 

机构地区：[1]浙江大学制冷与低温研究所,杭州310027 [2]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《工程热物理学报》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)

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.

关 键 词：喷射泵 Gedeon流 交变流动 非对称压降 

分 类 号：TB511[理学—物理]