斯特林机加热管交变流动强化传热模拟研究  

Numerical Investigation on Enhancing Heat Transfer of Oscillatory-flow in Heating Tube of Stirling Engine

作　　者：辛凤 刘志春[1] 郑年本 刘鹏[1] 刘伟[1] XIN Feng;LIU Zhi-Chun;ZHENG Nian-Ben;LIU Peng;LIU Wei(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学能源学院,武汉430074

出　　处：《工程热物理学报》2018年第11期2480-2488,共9页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51736004)

摘　　要：本文以氦气为工质,对斯特林机加热管内流体的变物性、可压缩、瞬态交变流动的换热规律进行了数值模拟.结果表明,流体在二头螺旋波纹管内产生纵向旋流涡,吸热量明显大于光管。从回热器端进入的575 K的工质流经壁温1000 K的两种加热管后,强化管比光管温升高160 K.采用两种PEC计算方法评价了螺纹波纹管的综合强化换热能力:单个周期瞬态PEC取平均值方法获得平均PEC值为1.69;周期内参数平均值计算PEC为1.38。由于膨胀腔、压缩腔内压力是MPa级变化,加热器中由于使用强化管导致的百帕级压降代价很小,却获得了加热器出口上百度的温升,使发动机的效率提高。This paper presented a numerical investigation of heat transfer for transient oscillatoryflow in a heating tube of Stifling engine. The working gas was compressible helium with variable properties. The results indicate that longitudinal vortexes existed in the spirally corrugated tube. The heat adsorption capacity of spirally corrugated tube was observably greater than that of smooth tube. The working gas flowed from regenerator end （575 K） and flowed through heating wall with constant temperature （1000 K）. The outlet temperature of fluid in spirally corrugated tube was 160 K higher than that of smooth tube. Two kinds of calculation method for average PEC in a cycle were used to evaluate the heat transfer enhancement. The average transient PEC value was 1.69 and the PEC calculated by average parameters was 1.38. The pressure change in expansion chamber and compression chamber was in the level of MPa, while the pressure drop that replacing smooth tube by spirally corrugated tube was in the level of hundred Pa. The outlet temperature for spirally corrugated tube was hundreds of K higher than that of smooth tube, which was beneficial to improve the efficiency of Stirling engine.

关 键 词：斯特林发动机 螺旋波纹加热管 纵向涡 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]