臺灣博碩士論文加值系統

本研究使用計算流體力學套裝軟體Fluent 6.3.26 來進行轉子引擎內部燃燒流場之模擬，並針對轉子凹槽構形及容積之變化對於燃燒室內部流場的影響進行詳細討論。
本模擬使用甲烷做為燃料，其主要研究參數包括凹槽構形、凹槽容積、燃料當量比和引擎轉速等，其中本研究先進行凹槽構形之分析，待決定出較佳構形後，再以此構形為基礎進行其它參數之研究。
本研究依開口方向來區分凹槽構形，分別為偏前凹槽、中置凹槽和偏後凹槽等，模擬結果顯示以偏前凹槽構形為較佳的凹槽構形，此結果與前人報導之趨勢相符合，至於轉子凹槽容積大小可以壓縮比來表示，本研究發現馬力相對於壓縮比而言，存在一最佳值，亦即當繼續減少凹槽容積來提高壓縮比時，馬力並不會提升。此外，本研究亦發現採用貧油燃燒時燃燒室內的溫度會提升，從而使得馬力增加，而引擎轉速提高亦能有效提升馬力的輸出。



關鍵字: 轉子引擎、凹槽構形、凹槽容積、燃料當量比、引擎轉速

The effects of rotor recess configuration and volume on the flow field inside combustor ware discussed in detail.
The key parameters include rotor recess configuration and volume, air-fuel equivalence ratio, and engine speed. The optimal configuration of rotor recess was first determined as the basic configuration for the study of other key parameters.
In this research, different rotor recesses according to open direction include leading deep recess, medium deep recess and trailing deep recess. The results of simulation indicate that the leading deep recess is the preferred configuration which is consistent with previous reports in literature. The volume of rotor recess can be expressed by compression ratio. It was found that there exists an optimal compression ratio. That is, further reduction of rotor recess volume to increase compression ratio can not promote the output horsepower. In addition, it was found that lean combustion can increase the temperature inside combustor to increase the engine horsepower. Increasing of engine speed can also increases the engine horsepower effectively.



Keywords: Rotary engine, Recess configuration, Recess volume, Air-fuel equivalence ratio, Engine speed

誌謝 I
摘要 II
ABSTRACT III
目錄 IV
圖目錄 VI
表目錄 XI
符號說明 XII
英文字母符號 XII
希臘符號 XIII
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 12
2.2.1 壓力與速度求解方法 13
2.2.2 離散化 14
2.2.3 PISO數值法 15
2.3 數值模擬流程 16
2.4 幾何構型與邊界條件 18
2.5 網格形式與配置 20
第三章 結果與討論 21
3.1凹槽構形對燃燒流場的影響 21
3.2凹槽容積對燃燒流場的影響 33
3.3當量比對燃燒流場的影響 37
3.4轉速對燃燒流場的影響 40
第四章 結論與建議 43
4.1 結論 43
4.2 建議 44
參考文獻 45

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