CFD simulation to investigate hydrodynamics of oscillating flow in a beta-type Stirling engine
CFD simulation to investigate hydrodynamics of oscillating flow in a beta-type Stirling engine
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DOI：
10.1016/j.energy.2018.04.017
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发表时间：
2018-06
期刊：
影响因子：
9
通讯作者：
M. Mohammadi;A. Jafarian
中科院分区：
文献类型：
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作者：
M. Mohammadi;A. Jafarian
近年来，人们通过热力学分析和CFD模拟两种不同的方法对斯特林发动机进行了理论研究。显然，二阶热力学分析比CFD更简单，耗时更少。然而，CFD考虑了更多的细节以及发动机的几何形状，因此反映了更多关于流场和损失现象的细节。本文利用开源软件OpenFoam对典型的斯特林发动机进行了数值模拟。动态网格用于模拟运动的活塞，工作流体被视为可压缩的。将体积平均技术应用于再生器内的多孔介质流动模拟。动量方程中的压力耦合采用了成熟的PIMPLE算法。为了研究湍流的影响，采用k-ω海温湍流模型进行了数值模拟，结果没有明显的变化。
Stirling engines have recently been studied theoretically via two different methods, thermodynamic analysis and CFD simulation. Evidently, second order thermodynamic analysis is simpler and less time consuming than CFD. However CFD considers more details as well as the engine geometry and consequently reflects more details about the flow field and losses phenomena. In this paper, numerical simulation of a typical Stirling engine was conducted by OpenFoam open source software. Dynamic mesh was used to simulate moving pistons and the working fluid was considered compressible. Volume averaging technique was applied to simulate flow in the regenerator as a porous media. The well-established PIMPLE algorithm was used to handle pressure coupling in momentum equation. To investigate the effect of turbulence, a simulation was conducted employing k-ω SST turbulence model and no significant change in the results was observed.