Numerical Analysis of Temperature Distribution of Stirling Engine Regenerator under Non-local Thermodynamics Equilibrium Theory
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摘要: 如何获得较为准确的回热器温度场分布,一直是碟式太阳能斯特林热机研究中的热点问题。本文构建了基于非局域热平衡理论的三维多孔介质动量方程与能量方程,以数值模拟的方法,探讨了回热器长度和分层、入口速度、填充介质孔隙率、气体工质材料及填充丝网目数等因素对于斯特林发动机回热器温度场分布的影响规律。结果表明:金属丝网孔隙率和气体工质流动速度对于金属丝网回热器的换热性能影响较大,适当地延长回热器长度能有效提高回热器的换热性能。Abstract: How to obtain a more accurate temperature distribution of regenerator has been a hot issue in the research of solar energy dish Stirling engine. In this paper, the momentum equation and energy equation of porous media based on non-local heat balance theory are established. With numerical analysis method, this paper discusses the influence law of the length of regenerator, layered wire mesh, inlet velocity, filling medium porosity, gas laser material, and the number of wire mesh on the temperature field distribution of the Stirling engine regenerator. The results show that the metal screen porosity and gas flow rate for wire mesh have a greater influence on the heat transfer performance of the regenerator. The appropriate extension of the length of regenerator can effectively improve the heat transfer performance of the regenerator.
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Key words:
- solar energy /
- temperature distribution /
- heat transfer /
- numerical analysis
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表 1 不同孔隙率的丝网阻力系数
孔隙率 黏性阻力系数 惯性阻力系数 0.6 2.98×1010 1.06×105 0.7 1.06×1010 5.02×105 0.8 3.15×109 2.24×104 表 2 丝网目数的参数
目数 孔隙率 黏性阻力系数 惯性阻力系数 180 0.705 5.41×109 3.55×104 200 0.668 1.01×1010 5.27×104 250 0.665 1.54×1010 6.53×104 表 3 回热器的分层情况
系列 孔隙率 长度/mm 一 0.6 15 0.7 15 0.8 15 二 0.8 15 0.7 15 0.6 15 三 0.6 30 0.8 15 四 0.8 30 0.6 15 -
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