Analysis of stable operation characteristics of free piston Stirling generator. (1st January 2023)

• Record Type: Journal Article
• Authors: Chunyun, Chi; Jian, Mou; Mingqiang, Lin; Kexin, Jiao; Guotong, Hong; Ruijie, Li
• Is Part Of: Thermal science and engineering progress. Volume 37(2023)
• Publication Date: 2023-01-01
• Subjects: Free piston stirling generator -- Coupled thermodynamic-dynamic model -- Hot end temperature -- Operating frequency; Heat engineering -- Periodicals; Heat engineering; Thermodynamics; Periodicals; 621.402
• DOI: 10.1016/j.tsep.2022.101588
• Languages: English
• ISSNs: 2451-9049

Abstract

Highlights: Thermodynamic-dynamic model is built to predict operation state of Stirling generator. Parameters effect analysis on the stable hot end temperature and frequency is studied. The model is verified by testing result and shows guiding role for generator design. Abstract: A dynamic model coupled with thermodynamics was developed to predict the stable operation condition of the free piston Stirling generator. The impact of parameters including displacer spring stiffness, piston spring stiffness, charging pressure, and external load on the stable critical hot end temperature and operating frequency was investigated. A prototype was tested to verify the model. It shows that the experimental result is well consistent with the simulated. There is an optimal displacer spring stiffness value where the generator's critical hot end temperature is the lowest. The operating frequency is proportional to the spring stiffness of the displacer and piston and is more sensitive to the former's variation. When the displacer stiffness increases by 0.93 times, the frequency increases by 10.75%, and when the piston stiffness increases by 1.29 times, the frequency increases by 6.35%. The simulated operating frequency is always higher than the experiment's, with a difference of less than 6.3%. Both external load and charging pressure are positively associated with the hot end temperature. It can be concluded that this model can play a guiding role in the research of stable operation characteristics of free piston Stirling generators.