交变流下回热器性能对比研究  

Comparison and research on performance of regenerator under oscillating flow

作　　者：陈鹏帆[1] 朱建炳[1] 冶文莲[1,2] 杨烈 CHEN Pengfan;ZHU Jianbing;YE Wenlian;YANG Lie(KeyLaboratory of Vacuum Technology and Physics,Lanzhou Institute of Physics,Lanzhou 730000,China;School of Energy Power and Engineering,Xi＇an Jiaotong University,Xi-an 710049,China;Schoolof Materials Science and Engineering,Xi＇an Jiaotong University,Xi＇an 710048,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000 [2]西安交通大学能源与动力工程学院,西安710049 [3]西安交通大学材料科学与工程学院,西安710048

出　　处：《中国空间科学技术》2018年第2期77-83,共7页Chinese Space Science and Technology

基　　金："十三五"民用航天科技专项

摘　　要：回热器是空间斯特林发电机的核心部件之一,根据Mo Bai提出的泡沫金属球心十四面体单元体结构,建立了泡沫镍单元模型并定量分析了孔密度、孔径及孔隙率之间的具体等量关系。通过建立回热器二维计算模型,采用ANSYS-Fluent软件对孔隙率在0.62~0.83的不锈钢丝网与孔隙率在0.94~0.98的泡沫镍两种填料中工质的流动过程进行数值模拟,对比分析了两种填料的传热及阻力特性,得到了不同孔隙率下填料的阻力系数、传热系数以及流动压降的变化情况。结果显示,泡沫镍型回热器进出口压力降幅值约为不锈钢丝网型回热器的1/400,而其传热系数约为不锈钢丝网的1/5。最后提出以参数Nu/Cf1/3作为综合衡量填料性能的指标,对比结果表明泡沫镍综合性能优于不锈钢丝网,能够用来作为空间斯特林发电机回热器的填料。Regenerator is one of the crucial components of Stirling engine.A unit cell model of Ni foam was developed based on the sphere-centered open-cell tetrakaidecahedron which was put forward by Mo Bai.Using this model,the correlation of pore density,pore diameter and porosity was quantitatively derived.The flow of working gas in stainless steel wire mesh（porosity：0.62-0.83）regenerator and Ni foam（porosity：0.94-0.98）regenerator was numerically simulated respectively based on the 2-D computational domain of regenerator.The analytical comparison of the above two fillers′heat transfer coefficient,pressure drop,and resistance coefficient was conducted.It is shown that the amplitude of pressure drop between inlet and outlet of Ni foam regenerator is 1/400 of stainless steel wire mesh regenerator′s,while the heat transfer coefficient is only 1/5.At last,the parameter Nu/Cf1/3 was put forward to evaluate the filler′s comprehensive performance.The comparison results show that the Ni foam has the better comprehensive performance than the stainless steel wire mesh,so it has the potential of being used as the regenerator′s filler of Stirling engine.

关 键 词：斯特林发电机 回热器 泡沫镍 不锈钢丝网 数值模拟 综合性能 

分 类 号：TK172[动力工程及工程热物理—热能工程]