A numerical model on thermodynamic analysis of free piston Stirling engines

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Mou, Jian^1,2 ; Hong, Guotong^1

Key Laboratory of Space Energy Conversion Technology, Technical Institute of Physics and Chemistry, CAS, Beijing

100190, China^1

University of Chinese Academy of Science, Beijing

100190, China^2

关键词: Design and optimization;    Energy conservation equations;    Energy conservation law;    Free piston Stirling engine;    Heat conduction loss;    Heat source temperatures;    Thermo dynamic analysis;    Thermodynamic model;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012090/pdf
DOI  :  10.1088/1757-899X/171/1/012090

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

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.