基于未来太阳能应用的重大需求及国内斯特林发电技术较为落后的现状,提出一种自由活塞斯特林发电机的设计优化方法。使用Sage软件建立发电机的热力学模型,利用软件的优化功能进行参数优化,同时结合直线电机的力学平衡方程修正优化结果。利用该方法优化设计新实验样机,同时获得冷端温度、动力活塞板簧刚度和运行压力等参数对发电机输出性能的影响规律,并与实验进行对比。实验结果表明,各参数对发电机输出性能的影响与模拟基本一致。新实验样机在热端温度865 K、冷端温度300 K条件下输出136.6 W的电功率,热电效率达到27.8%,较旧样机提升10.4%,与模拟值误差为6.0%。
Abstract
Based on the significant demand for solar energy application in the future and the relatively weak development status of domestic Stirling power generation technology, a design and optimization method of free piston Stirling generator is proposed. The thermodynamic model of the generator is established by using Sage software. The optimization function of Sage software is used to optimize the generator parameters, and the optimized results are corrected combined with the mechanical equilibrium equation of linear motor. With the usage of the method, a new prototype is designed and the effect of different parameters （i.e. cold end temperature, piston spring stiffness, and operating pressure） on performance is obtained, which were compared with the experiment results. The results illustrate that the effect of each parameter on generator output performance is consistent with the simulation. When the temperatures of the hot end and cold end are 865 K and 300 K, respectively, the electrical power of the new prototype is 136.6 W and the thermal-electric efficiency is 27.8% which is 10.4% higher than that of the original prototype, error between experiment and simulation is 6.0%.
关键词
自由活塞 /
斯特林发电机 /
热力学 /
力学平衡方程
Key words
free piston /
Stirling generator /
thermodynamics /
mechanical equilibrium equation
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基金
国家重点研发计划（2020YFB1901800)
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