運用煤油及汽油於雙燃料均質進氣壓燃引擎運轉範圍研究

Investigation of Operating Regions of Kerosene and Gasoline in a Dual Fuel HCCI Engine

黃裕棠(Yuh-Tang Huang)

指導教授 ： 吳浴沂

國立臺北科技大學/機電學院/車輛工程系所/碩士(2009年)

摘要

均質進氣壓縮燃燒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。本研究以煤油在HCCI模式下，取得數點爆震極限下之運轉範圍，再針對定轉及定負載的條件下，調整煤油及汽油量以觀察燃燒現象。接著再以定轉速及定負載不同條件下加入汽油，觀察燃燒改變的情形。最後選定在定轉速的條件，增加汽油的量並減少煤油的量來藉由延遲的燃燒相位使得IMEP增加。
實驗結果顯示因燃料性質的差異，低辛烷值的煤油在第一階段的熱釋放較為明顯，並可使缸內溫度升高，而高辛烷值的汽油因自燃溫度較高會有較遲燃燒的現象。因此藉由煤油第一階段熱釋放使缸內溫度升高後，再引燃高辛烷值的汽油以達到使燃燒相位延後的目的。在爆震極限下IMEP從使用煤油的3.25-3.57bar增加至使用雙燃料的3.75-4.15bar，不同條件下IMEP約有14-24%的增加。

關鍵字

均質進氣壓燃引擎 ； 雙燃料

並列摘要

HCCI engine combines advantage of high efficiency of diesel engine with low emission of spark ignition engine. But it is very difficult to control combustion of HCCI engine, which its operating region can not be applied to road driving. In the beginning of the experiment, kerosene is used in a HCCI motorcycle engine where its operating regions are got under knocking limit. In order to observe combustion, the quantity of kerosene and gasoline is adjusted under both fixed engine speed and fixed load, then the gasoline is added under the conditions of fixed engine speed or fixed load. Finally, at fixed engine speed the quantity of gasoline is added while the quantity of kerosene is reduced in order to delay combustion phase and increase the IMEP.
Experimental results show the differences between octane number of two fuels, the first-stage heat release of kerosene is obvious, and gasoline is ignited by the delay of high temperature. Under knocking limit and different conditions, IMEP can be increased by 14-24%.

並列關鍵字

HCCI ； Dual Fuel

參考文獻

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