新型回热器结构设计及换热特性研究  

A structure design and heat transfer characteristics research of the new type regenerator

作　　者：刘繁茂 蒋彭 张磊 彭佑多 LIU Fan-mao;JIANG Peng;ZHANG Lei;PENG You-duo(Engineering Research Center for Advanced Mine Equipment of Ministry of Education,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学先进矿山装备教育部工程研究中心

出　　处：《热科学与技术》2018年第4期273-282,共10页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51576061);湖南省科技计划资助项目(2012FJ6121);湖南省自然科学基金资助项目(2016JJ2052)

摘　　要：回热器作为斯特林热机的关键部件，对于太阳能斯特林热机整机性能有着重要影响。为克服传统金属丝网回热器结构存在的填料单一，制造成本较高，工艺复杂问题，采用实用等温分析法，以回热器的长径比、通流面积、填料种类以及孔隙率各项回热器参数为基础，设计了一种新型斯特林热机回热器，该回热器具有轴向压降小，换热性能高，结构稳定，加工制造简单的特点。开展了新型回热器和传统金属丝网回热器的换热性能对比研究，采用振荡条件下的局部热平衡方法研究回热器的传热过程，对比传统金属丝网回热器和新型回热器的温度变化，速度变化以及压力变化。结果表明：在整体孔隙率相同的条件下，新型回热器和传统金属丝网回热器相比，整体启动速率相似，但新型回热器压降减少0．04MPa，速度出现分段式变化，有利于回热器的换热和结构稳定。因此，新型回热器不但在结构上优于传统金属丝网回热器，在换热特性上也优于传统金属丝网回热器。As the key component of Stirling engine, the regenerator has an important influence on the performance of solar Stirling engine. Therefore, it is necessary to study its structure and heat transfer characteristics. In order to overcome the problems of packing singleness of traditional wire regenerator, high cost and complex process, a new type of Stirling heat engine regenerator has been designed based on the length-diameter ratio of the regenerator, the flow area, the type of packing and the parameters of the porosity of the regenerator. The regenerator has a low axial pressure drop, high heat transfer performance, stable structure, and simple processing and manufacturing characteristics. The heat transfer performance of the new type regenerator was compared with that of traditional wire mesh regenerator. The local thermal equilibrium method at oscillation was applied to study the heat transfer process of the regenerator, and the temperature, speed and pressure changes were compared for the two regenerators. The results showed that under the condition of the same porosity, new regenerator reduced the pressure drop of 0.04 MPa compared to the traditional wire mesh regenerator though the start speeds were similar. Therefore, the new type regenerator is superior to the traditional metal mesh regenerator not only in structure, but also in heat transfer.

关 键 词：斯特林热机 回热器 局部热平衡 换热特性 

分 类 号：TK11[动力工程及工程热物理—热能工程]