臺灣博碩士論文加值系統

均質進氣壓燃(Homogeneous Charge Compression Ignition, HCCI)引擎兼具柴油引擎的高熱效率與汽油引擎低排污的優點，但均質壓燃引擎的燃燒較不易控制，運轉範圍也不能滿足一般行駛的需求，因此HCCI引擎燃燒特性極為重要，因此本論文針對HCCI引擎燃燒特性進行研究。
本論文利用125 cc單缸氣冷式四行程氣道噴射汽油引擎進行HCCI引擎改裝。為了使目標引擎能夠較容易的在HCCI模式下運轉，所以直接替換150 cc之汽缸，故壓縮比提升，使壓縮溫度提高，讓燃料容易自燃，燃燒分析項目包含最大汽缸壓力、最大熱釋放率、CA50…等。
實驗結果DME、煤油、庚烷燃料是屬於低辛烷值燃料，因此會有二階段熱釋放的現象，若單純使用單燃料做為HCCI運轉的燃料，則會因熱釋放率過早發生而爆震，因此無法穩定運轉。使用雙燃料搭配較易自燃的燃料(低辛烷值)為主燃料，如DME、煤油、庚烷，加入較不易自燃的燃料(高辛烷值)，如92無鉛汽油、95無鉛汽油，再導入EGR，可以延後最大汽缸壓力、熱釋放率的發生。

HCCI engine combines advantage of high efficiency of diesel engine with low emission of spark ignition engine. But it is very difficult to control the combustion of HCCI engine, which operating region can not be applied to road driving. Combustion characteristics of the HCCI engine is extremely important so the research discusses the combustion characteristics.
In this paper, the use of 125 cc single-cylinder air-cooled four-stroke gasoline engine. In order to can easily operate in HCCI engine, so replacement for 150 cc of the cylinder. The compression ratio and the compression temperature are increased, so that the fuel is easy to combustion. Combustion analysis contains the maximum cylinder pressure, maximum heat release rate, CA50 and so on.
The experimental results show that DME, kerosene and n-heptane are low-octane fuel. It appears two-stage heat release phenomenon. If only using a single fuel occur not stable operation due to the heat release rate is advance and premature explosion shock. Using dual-fuel such as DME, kerosene and n-heptan with RON 92 or RON 95 can delay the maximum cylinder pressure, heat release rate of occurrence. When the load increases, it certainly needs to supply more fuel.

摘　要 i
ABSTRACT ii
誌 謝 iii
目 錄 iv
表目錄 vi
圖目錄 vii
第一章 前言 1
1.1 研究背景及動機 1
1.2 研究目的及方法 3
第二章 文獻回顧 4
2.1 均質壓燃技術 4
2.2 均質壓燃特性 5
2.3 均質進氣壓燃引擎之優缺點 7
2.4均質進氣壓燃引擎廢氣排放現象 8
2.5均質進氣壓燃引擎引燃方式 9
2.6雙燃料於均質進氣壓燃引擎 16
第三章 實驗設備與方法 22
3.1 實驗設備 22
3.2 實驗方法 28
3.2.1燃料選擇 29
3.2.2 SI模式與HCCI模式切換 32
3.2.3 HCCI模式引擎測試點 32
3.2.5 熱釋放率計算 33
3.2.6 引擎循環變異量 35
3.2.7 實驗數據計算式 36
第四章 結果與討論 37
4.1 庚烷燃料 37
4.2 純DME燃料 43
4.3 DME和95無鉛汽油雙燃料 46
4.4 DME和92無鉛汽油雙燃料 48
4.5 純煤油燃料 54
4.6 煤油和92無鉛汽油雙燃料 57
4.7 DME和LPG雙燃料 60
4.8 DME和丁醇雙燃料 62
4.9庚烷燃料性能探討 64
第五章 結論 65
5.1 結論 65
參考文獻 66
符號彙編 77

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