National Taiwan Ocean University Institutional Repository:Item 987654321/36079
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题名: 直噴柴油機使用柴油/LPG混合燃料改變噴油設定之實驗研究
An Experimental Study of Changing Injection Settings for a DI CI Engine Fuelled with Diesel/LPG Blends
作者: Meng-HHuan Li
李孟桓
贡献者: NTOU:Department of Mechanical and Mechatronic Engineering
國立臺灣海洋大學:機械與機電工程學系
关键词: 柴油機;廢氣排放;LPG;柴油;混合燃料
Diesel engine;exhaust emissions;LPG;diesel;blend fuel
日期: 2012
上传时间: 2013-10-07T03:02:48Z
摘要: 液化石油氣(LPG)為一新型替代潔淨能源,如何減少廢氣排放、提高能源效率為最新研究議題,使LPG的車用引擎應用受到重視。 本實驗對一直噴式柴油引擎進行改裝,使用LPG與柴油混合燃料,研究兩種混合比例,分別為L30D70、L40D60混合燃料,改變噴油正時、噴油壓力、噴油孔徑,並添加十六烷值添加劑,探討混合燃料使用不同噴油設定時,引擎油耗與廢氣排放之影響。 實驗結果顯示,L30D70、L40D60混合燃料,在低負載下單位馬力耗能率低於柴油,中高負載時與柴油相當。而轉速於1500rpm時,燃料轉換效率在各負載下均大於柴油。 混合燃料之bsCO排放較柴油增加。低負載時較柴油大幅增加,中高負載時差距較小。兩種混合燃料使用較大之噴油孔徑0.22 mm時,在不同轉速下之bsHC及bsCO排放均較柴油、或使用其他噴油設定時為高,但其bsNOx排放及燃料轉換效率卻較低。 L40D60混合燃料其黑煙汙染度大約在1%以下,低負載下與柴油互有高低,高負載下明顯較柴油為低。2000 rpm時混合燃料黑煙汙染度大致均較柴油為低。L30D70混合燃料其黑煙汙染度比L40D60為高,約為1.5%。
LPG is a new alternative clean fuel for diesel engines. How to reduce air pollution while raising the energy efficiency is a new research direction. It is therefore important to study the application of LPG fuel in automobile engines. In this study, a DI CI diesel engine is modified to be fuelled with the blends of LPG and diesel fuel in two different proportions. The settings of injection pressure, injection nozzle diameter and injection timing are changed to study the effects on the exhaust emissions and fuel economy of a DI diesel engine. The experimental results show that the bsEC of L30D70 and L40D60 fuel blends is lower than diesel fuel under light engine loads, and of similar values under heavier loads. The fuel conversion efficiency of fuel blends is generally higher than diesel at 1500rpm speed under different engine loads. At all engine speeds, the bsCO emission of fuel blends is generally higher than diesel. The trends are remarkrably higher bsCO emission of fuel blends than diesel under light engine loads, but almost similar bsCO with diesel under heavier engine loads. Using a larger injector aperture 0.22mm, the results of fuel blends lead to higher bsHC, bsCO emissions and smoke level, and lower NOx emission and fuel conversion efficiency, compared with those obtained when using a 0.20mm injector aperture, and compared with diesel fuel. The smoke level of L40D60 is approximately below 1%. Under a high load or at 2000 rpm speed, the smoke level of L40D60 is lower than diesel ii fuel. The smoke level of L30D70 fuel blend is higher than L40D60 by about 1.5%.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0019972049
http://ntour.ntou.edu.tw/handle/987654321/36079
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