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研究生： 羅文俊
Rajendiran, Nagarajan
論文名稱： 熱延遲史特靈引擎之熱力循環與熱效率之數值預測
Numerical predictions of thermodynamic cycle and thermal efficiency of thermal-lag Stirling engine
指導教授： 鄭金祥
Cheng, Chin-Hsiang
學位類別： 碩士
Master
系所名稱： 工學院 - 航空太空工程學系
Department of Aeronautics & Astronautics
論文出版年： 2017
畢業學年度： 105
語文別： 英文
論文頁數： 75
外文關鍵詞： Numerical simulation, Thermal-lag, CFD.
相關次數： 點閱：169  下載：9 
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    • This study is aimed at development of a numerical model for predicting thermodynamic cycle and thermal efficiency of thermal-lag Stirling engine. Thermal-lag Stirling engine is working through the principle of thermal-lag instability phenomenon. In thermal-lag engine, piston is the only moving part. So, the configuration of this engine is simpler when compared to other traditional Stirling engine. A computational fluid dynamics (CFD) numerical simulation method is used to predict the transient variations of pressure, temperature and working fluid mass in the individual working spaces of the engine. A parametric study of the effect of working gas pressure, heating temperature, cooling temperature, regenerator porosity and rotation speed on the performance of thermal-lag Stirling engine is carried out. Also, the numerical simulation of engine power output, torque and the thermal efficiency has been computed with the different operating speed, heating temperature, cooling temperature and the working gas pressure. The optimum engine speed at which the engine can reach the maximum power output and thermal efficiency has been determined. With the help of numerical simulation, the thermal-lag engine performance was analyzed with the different operating conditions.

    TABLE OF CONTENTS ABSTRACT I ACKNOWLEDGEMENT II LIST OF TABLES VI LIST OF FIGURES VII NOMENCLATURE X CHAPTER - I INTRODUCTION 1 1.1 Thermal-lag Stirling engine configuration 2 1.2 Thermal-lag Stirling engine principle 3 1.3 Importance of numerical simulation of Stirling engine design 4 1.4 Literature review 5 CHAPTER - II NUMERICAL METHODS 11 2.1 Introduction to simulation software 11 2.1.1 Preprocessing 11 2.1.2 Solver 11 2.1.3 Post-processing 12 2.2 Numerical model description 12 2.3 Grid generation method 13 2.4 The governing equations 14 2.5 Fluent setup and solving method 17 2.5.1 Solver type 17 2.5.2 Turbulent model 17 2.5.3 Solution methods 20 2.5.4 Porous zone condition 20 2.5.5 Boundary conditions 22 2.6 Solution initialization method 23 2.7 Power, torque and thermal efficiency 23 2.8 Piston position equation 24 CHAPTER - III RESULTS AND DISCUSSION 25 3.1 Masses of the working fluid in individual working spaces 26 3.2 Temperature distribution in different working spaces 26 3.3 Static gauge pressure and absolute pressure distribution 27 3.4 Volume variation and piston position 28 3.5 P-V diagram 28 3.6 Heat flux in high temperature working space 29 3.7 Power output, thermal efficiency and torque 30 3.7.1 The effect of heating temperature on engine performance 30 3.8 Effect of operating pressure on engine performance 31 3.9 Effect of cooling temperature on engine performance 32 3.10 Effect of regenerator porosity on engine performance 33 CHAPTER - IV CONCLUSIONS 35 REFERENCES 36

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