A numerical model on thermodynamic analysis of free piston Stirling engines
A numerical model on thermodynamic analysis of free piston Stirling engines
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DOI：
10.1088/1757-899x/171/1/012090
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
J. Mou;G. Hong
中科院分区：
文献类型：
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作者：
J. Mou;G. Hong
本文采用基于能量守恒定律的数值热力学模型对自由活塞斯特林发动机进行了分析。在模型中，所有数据都取自我们实验室建造的一台真实的自由活塞斯特林发动机。将能量守恒方程应用于发动机的膨胀空间和压缩空间。方程包括热力学能、输入功率、输出功率、焓和热损失。热损失包括蓄热损失、穿梭热损失、密封泄漏损失和腔壁导热损失。数值结果表明，膨胀空间温度和压缩空间温度随时间的变化而变化。再生效率越高，效率越高，输出功越大。研究还发现，在不同的初始压力下，热源温度、相位角和发动机工作频率对发动机效率和功率的影响是不同的。因此，该模型有望成为斯特林发动机仿真、设计和优化的有用工具。
In this paper, a new numerical thermodynamic model which bases on the energy conservation law has been used to analyze the free piston Stirling engine. In the model all data was taken from a real free piston Stirling engine which has been built in our laboratory. The energy conservation equations have been applied to expansion space and compression space of the engine. The equation includes internal energy, input power, output power, enthalpy and the heat losses. The heat losses include regenerative heat conduction loss, shuttle heat loss, seal leakage loss and the cavity wall heat conduction loss. The numerical results show that the temperature of expansion space and the temperature of compression space vary with the time. The higher regeneration effectiveness, the higher efficiency and bigger output work. It is also found that under different initial pressures, the heat source temperature, phase angle and engine work frequency pose different effects on the engine’s efficiency and power. As a result, the model is expected to be a useful tool for simulation, design and optimization of Stirling engines.