摘要
斯特林发动机中回热器的有效性对斯特林发动机的整机性能有较大的影响。文中通过商业软件FLUENT的动网格功能模拟了回热器内部流场的交变流动以及流体工质与回热器之间的往复式热量交换,进而捕捉斯特林发动机运行时,回热器基体在高速交变气体流场中温度场的变化规律。研究结果表明,回热器的有效性和流阻损失随孔隙率的增大而减小,随长径比的增大而增大。因此在设计斯特林发动机时需要综合考虑回热器的孔隙率和长径比。
The efficiency of regenerator of Stirling engine influences mightily the performance of Stirling engine. The periodical oscillating flow in the regenerator and the heat transfer characteristics between fluid and regenerator are modeled in two dimensions by the dynamic mesh model of the commercial CFD software-FLUENT. Moreover, the regenerator temperature field can be also simulated when the Stirling engine begins to work. The results show that the effectiveness of regenerator and loss of flow resistance decrease with the increase of the porosity, and increase with the increase of length-diameter ratio. Therefore the porosity and length-diameter ratio need to be selected according to the overall design requirements of the engine.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2014年第2期265-271,共7页
Journal of Nanjing University of Aeronautics & Astronautics
基金
江苏高校优势学科建设工程和江苏省过程强化与新能源装备技术重点实验室(南京工业大学)资助项目
关键词
回热器性能
孔隙率
长径比
有效性
流阻损失
regenerator performance
porosity
length-diameter ratio
effectiveness
loss of flow resistance
