Theoretical Analysis and Design of Double Acting Four-Cylinder Stirling Engine

• Main Authors: Tien-YuehFung, 馮典樂
• Other Authors: Chin-Hsiang Cheng
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/72t9uj

碩士 === 國立成功大學 === 航空太空工程學系 === 105 === This thesis is dedicated to the investigation of the operating principle and theoretical model analysis of a double acting four-cylinder Stirling engine. A prototype engine is built for the purpose of this thesis and further analysis, and a wobble yoke mechanism is selected for mechanical design. The analysis of the double acting Stirling engine begins by dividing the engine to a single chamber, containing five sub-chambers: expansion chamber, heating chamber, regeneration chamber, cooling chamber and compression chamber. Each sub-chamber is analyzed for pressure, volume, temperature and mass variation of the working fluid. Pressure drop by friction loss is then taken into consideration. Upon completion of setting up theoretical model, it is compiled in numerical simulation under prototype engine parameters to simulate engine operating conditions. With gaseous helium as working fluid and under the condition of 6 atmospheres, 1000 rpm of engine speed, 1000 Kelvin heating temperature and 300 Kelvin cooling temperature, the resulting single chamber power is 202.94 Watts, and the thermal efficiency is 7.75%. Further investigation of four-chamber simulation with equal initial pressure conditions shows results of engine power 736.6 Watts and thermal efficiency 9.4%. In parallel, the results for a four-chamber simulation under equal mass condition are 774.7 Watts for engine power and 7.74% for thermal efficiency.