臺灣博碩士論文加值系統

本研究採用計算流體力學之套裝軟體Fluent來進行轉子引擎內部流場之模擬，並針對轉子凹槽構型及洩漏效應對燃燒室內部流場及燃燒性能所造成之影響進行討論。本研究之主要研究參數為：凹槽構型配置、凹槽寬高比、洩漏效應等，而本研究將先從前置、中置、後置三種凹槽構型配置中選出性能較佳之凹槽構型，再以該構型進行凹槽寬高比之改變與加入洩漏效應來進行模擬分析與比較。根據數值模擬結果之分析，本研究歸納出前置凹槽構型不論是在引擎指示馬力、引擎指示平均有效壓力及引擎燃油消耗率等皆有最佳之表現；而在改變凹槽寬高比之比較中，本研究發現凹槽寬高比存在一最佳值，大於或小於該值皆會對燃燒性能造成不良影響。另外，本研究亦發現洩漏效應的引入，對轉子引擎燃燒性能所造成的不良影響相當地顯著。

The purpose of this study is to simulate the flow field of the combustion chamber with considering the effects of the rotor recess configuration and leakage on the flow field inside the combustion chamber by using computational fluid dynamic software, Fluent. The key parameters of this study include arrangement of rotor recess configuration, aspect ratio of rotor recess, and leakage of apex. Firstly, the optimal recess configuration among different configurations including leading, medium, and trailing deep recesses has been determined and then to be the basic configuration for the study of other key parameters. The simulation results show that the leading deep recess has the best performance for indicated horsepower, indicated mean effect pressure, and specific fuel consumption. Moreover, this study found that there exists an optimal value of the recess aspect ratio. It means that when the value of aspect ratio is greater or smaller than that value, it will cause bad effects on the combustion performance. In addition, this study also has found that leakage of apex has the significant reduction of combustion performance in rotary engine.

誌謝 i
摘要 ii
ABSTRACT iii
目錄 iv
表目錄 vii
圖目錄 viii
符號說明 xv
英文字母符號 xv
希臘符號 xv
第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻回顧 4
1.3 研究目的 8
第二章 數學模式與數值方法 9
2.1 數學模式 9
2.2 數值方法 11
2.2.1 壓力與速度求解方法 12
2.2.2 離散化 13
2.2.3 PISO數值法 14
2.2.4 動態網格生成方法 14
2.2.5 多孔性介質模型 16
2.3 數值模擬流程 19
2.3.1 前處理( Pre-Process ) 19
2.3.2 求解器( Solver ) 21
2.3.3 後處理( Post-Process ) 22
第三章　結果與討論 23
3.1相同凹槽寬高比下之凹槽構型對燃燒性能的影響 23
3.1.1前置凹槽構型 23
3.1.2中置凹槽構型 25
3.1.3後置凹槽構型 27
3.2具不同凹槽寬高比之凹槽構型對燃燒性能之影響 29
3.3洩漏效應對燃燒性能之影響 32
第四章　結論與建議 35
4.1結論 35
4.2建議 36
參考文獻 107

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