臺灣博碩士論文加值系統

本論文以單缸500 cc水冷式引擎使用二甲醚 (dimethyl ether, DME)進行HCCI實驗；以實驗量測數據後配合理論方程式，推導油耗、污染及效率數據分析，找出最好的運轉模式，當HCCI引擎運轉在2000 rpm到4000 rpm轉速且中負載時BSFC較好。
以生質燃料為主要目標，針對二甲醚 (dimethyl ether, DME)、92無鉛汽油進行HCCI運轉研究，從燃燒分析的結果可以得知，生質燃料DME作為主要燃料，加入92無鉛汽油及導入外部EGR，並將壓縮比從9.9提高到12.0，沒有進氣加熱或氣門控制等複雜的裝置。運轉範圍轉速從2000 rpm到4000 rpm，且這些運轉點之中，雖然HC比原SI運轉模式高，但熱效率較原SI模式運轉時高， CO也較原SI運轉模式彽，而且NOx排放量非常少。
HCCI 500cc單缸水冷式相較於150cc單缸氣冷式之制動熱效率，其結果500cc單缸水冷式引擎在較高負載下，其制動熱效率明顯高於150cc單缸氣冷式引擎；而在低負載下，水冷及氣冷HCCI引擎制動熱效率皆低於30%以下。

The objective of this thesis use biomass fuel or alternative fuel in 500 cc single cylinder water cooling engine with HCCI (homogeneous charge compression ignition) operation, to analyze the fuel consumption of internal combustion engine based on experimental data, and then to find out an optimum system which achieves BSFC (brake specific fuel consumption) lower than 250 g/kW-h.
Several biomass fuels and alternative fuels are evaluated for HCCI engine. They are: dimethyl ether (DME) and gasoline. Finally, a system with DME and 92 non-lead gasoline dual fuel can run HCCI stably. External EGR are used. The operating ranges are: engine speed from 2000 rpm to 4000 rpm.
This system can achieve BSFC lower than 250 g/kW-h with very low NOx emission. The CO emissions are also less than those of traditional SI (spark-ignition) engine. The HCCI brake thermal efficiency of 500 cc single cylinder water cooling engine is better than 150 cc single cylinder air cooling engine in higher load. However, both of the two HCCI brake thermal efficiency are lower than 30% in lower load.

中文摘要 i
英文摘要 ii
誌謝 iv
目錄 v
表目錄 vii
圖目錄 viii
第一章 前言 1
1.1 研究背景與目的 1
1.2 文獻回顧 2
1.3 HCCI引擎研究架構圖 11
第二章 均質進氣壓縮燃燒介紹 12
2.1 HCCI引擎介紹 12
2.2 HCCI之優缺點 13
2.3 HCCI系統設計 14
第三章 實驗設備與方法 20
3.1 實驗設備 20
3.1.1 實驗引擎 20
3.1.2 電子燃油噴射系統 21
3.1.3 Woodward MCS套件及其相關配備接法 23
3.1.4 DME流量計 25
3.1.5 引擎動力計 26
3.1.6 燃油流量計 28
3.1.7 廢氣及空燃比分析儀 30
3.1.8 熱電偶式溫度感知器 32
3.2 實驗方法 33
3.2.1最佳燃料評估 33
3.2.2 SI模式切換HCCI模式說明 35
3.2.3 HCCI模式引擎測試點 35
3.3 實驗數據計算式 36
第四章 結果與討論 38
4.1 HCCI運轉較佳之系統 38
4.2 目標引擎HCCI運轉範圍 42
4.3引擎油耗汙染分析 44
4.3.1傳統SI和HCCI引擎之BSFC 44
4.3.2傳統SI和HCCI引擎之BSCO 46
4.3.3傳統SI和HCCI引擎之BSHC 47
4.3.4傳統SI和HCCI引擎之BSNOx 49
4.4 HCCI引擎制動熱效率比較 50
第五章 結論與未來展望 52
5.1 結論 52
5.2 未來展望 53
參考文獻 54
符號彙編 56

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