环形CW型原表面回热器通道流动换热及熵产特性分析  

Analysis of flow heat transfer and entropy generation characteristics of annular CW primary surface recuperator channel

作　　者：吴延龙 谢文棋 俞建阳[2] 谢维潇 WU Yanlong;XIE Wenqi;YU Jianyang;XIE Weixiao(China Academy of Space Technology,Beijing 100094,China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国空间技术研究院,北京100094 [2]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《航天器环境工程》2023年第4期338-348,共11页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:52006045);黑龙江省自然科学基金项目(编号:LH2021E062)。

摘　　要：着眼于提升临近空间可重复使用航天器的能源利用效率,文章探究环形CW型原表面回热器通道流动换热与熵产特性。以其换热单元体为研究对象,采用k-ε湍流模型和周期性边界条件,通过分析回热器流道出口截面的速度和温度参数分布,讨论了冷热侧进口参数(雷诺数、温度)对回热器流动特性与换热性能的影响。结果表明,增大雷诺数会使冷热侧出口截面温度降低、速度提升,形成中心涡,使流道侧壁摩擦阻力及压力损失增大,导致回热器换热性能下降。熵产分析验证了此结论:随雷诺数增大,换热单元总熵产率增大。雷诺数不变时,改变冷热侧进口温度,结合面优度系数和总熵产率的综合变化,得到回热器的最佳工作温度为燃气进口温度874.8 K、空气进口温度485.6 K。With a view to improving the energy utilization efficiency of reusable spacecraft in the near space,the characteristics of flow heat transfer and entropy generation in the channel of the annular CW primary surface recuperator were investigated.Taking its heat exchange unit as the research object,the k-ε turbulent model and the periodic boundary conditions were applied to discuss the effects of the inlet parameters(i.e.the Reynolds number and temperature) on the flow characteristics and heat transfer performance of the regenerator by analyzing the velocity and temperature distributions of the outlet section of the regenerator channel.The results show that increasing the Reynolds number will reduce the temperature and increase the velocity of the outlet section of the cold and hot sides,until a central vortex is formed,which will increase the friction resistance and pressure loss of the side wall of the flow channel,thus reduce the heat transfer performance of the regenerator.The entropy generation analysis verified that,with the increase of Reynolds number,the total entropy yield increased.When the Reynolds number was constant,by changing the inlet temperature of the cold and hot sides and combined with the comprehensive changes of the surface goodness coefficient and the total entropy yield,the optimal working temperature of the regenerator can be 874.8 K for the gas inlet and 485.6 K for the air inlet respectively.

关 键 词：CW型原表面回热器 数值模拟 体换热性能 熵产分析 回热模型 

分 类 号：O551.3[理学—热学与物质分子运动论] V43[理学—物理]