Design and Analysis of a Free-Piston Stirling Engine

• Main Authors: Jun-YouGuo, 郭俊佑
• Other Authors: Chin-Hsiang Cheng
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/07333264581668057175

碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 101 === The major purpose of this study is to develop a novel Free-Piston Stirling engine, which is able to achieve quick starting from rest at high oscillation frequency, by connecting the displacer to the piston with a spring. A prototype engine has been designed, manufactured and assembled successfully for experiments. In the mean times, theoretical modeling integrating a dynamic and a thermodynamic models has been performed for numerical predictions of the performance of the engine. The dynamic model involves two equations of motions which govern the kinematic behaviors of both the displacer and the piston. On the other hand, in the thermodynamic model, the engine is divided into three chambers (expansion chamber, regenerative channels, and compression chamber) and effects on engine performance of key parameters, such as heating temperature, diameter of central shaft of the displacer, mass of the piston, displacer spring constant, and piston spring constant, are evaluated. The predictions by the theoretical model are further confirmed by the experiments. For example, for the base-line case, the numerical prediction of the oscillation frequency by the theoretical model is approximately 30.5 Hz, which is close to the experimental reading of 30.2 Hz.