運用二甲醚及汽油於雙燃
料均質進氣壓燃引擎之研究

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。

關鍵字

均質壓燃；汽油引擎；油引擎；廢氣再循環；二甲醚

並列摘要

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.

並列關鍵字

Homogeneous Charge Compression Ignition ； Spark-Ignition Engine ； Compression Ignition Engine ； Exhaust Gas Recirculation ； Dimethyl Ether

參考文獻

[1] Kano, M., Saito, K., Basaki, M., Matsushita, S., and Gohno, T., 1998, “Analysis of Mixture Formation of Direct Injection Gasoline Engine,” SAE Paper No. 980157.

[2] Zhao, F. Q., Lai, M. C., and Harrington, D. L., 1997, “A review of mixture preparation and combustion control strategies for spark-ignited direct-injection gasoline engines,” SAE Paper No. 970627.

[3] Harada, J., Tomita, T., Mizuno, H., Mashiki, Z., and Ito, Y., 1997, “Development of direct-injection gasoline engine,” SAE Paper No. 970540.

[5] Yang, J., Culp, T., and Kenney T., 2002, “Development of a Gasoline Engine System Using HCCI Technology –– The Concept and the Test Results,” SAE Paper No. 2002-01-2832.

[6] Stanglmaier, R. H., and Roberts, C. E., 1999, “Homogeneous charge compression ignition (HCCI): Benefits, compromises, and future engine applications,” SAE Paper No. 1999-01-3682.

國際替代計量

運用二甲醚及汽油於雙燃料均質進氣壓燃引擎之研究

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