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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/13881

Title: 二甲醚/柴油混合燃料柴油機改變噴油參數及混合比例之實驗研究
An Experimental Study on Changing Fuel Injection Parameters and DME / Diesel Blend Ratio for a Diesel Engine
Authors: Yu-Yuan Chen
陳宇元
Contributors: NTOU:Department of Mechanical and Mechatronic Engineering
國立臺灣海洋大學:機械與機電工程學系
Keywords: 二甲醚;混合燃料;噴油正時;柴油機性能;廢氣排放
dimethyl-ether;blend fuel;injection timing;diesel engine performance;exhaust emissions
Date: 2010
Issue Date: 2011-06-30T07:29:31Z
Abstract: 二甲醚為生產原料多元化,並且適用於柴油機之新型清潔替代能源。本實驗將一具單氣缸直噴式柴油機之燃油系統進行小幅度改裝,使用二甲醚與B1超級柴油之混合燃料進行引擎試驗,研究不同混合比例下,改變噴油正時與噴油參數,對柴油機性能與廢氣排放之影響。 實驗結果顯示,混合燃料使用原廠噴油設定對引擎性能與廢氣排放皆較柴油差。當混合燃料使用加大直徑噴油泵柱塞,使每循環供油體積為原廠之1.52倍;並使用加大噴油嘴孔徑,使開口總面積為原廠之1.69倍,故引擎性能與廢氣排放皆有改善趨勢。 對於D30混合燃料之實驗結果以原廠噴油正時較佳,噴油正時略微延後之結果居次。引擎全負載制動扭力較柴油高;雖然制動單位馬力耗油率bsfc較柴油增加,但制動單位馬力耗能率bsEC較柴油降低。NOx排放較柴油降低14%~67%,黑煙排放則降低23%~46%。但HC排放較柴油增加17%~70%。CO排放在低轉速較柴油降低15%~83%,但在高轉速增加25%~194%。 D70混合燃料之噴油壓力降低至157.4bar。實驗結果以延後噴油正時13°bTDC最佳,全負載制動扭力低轉速較柴油增加15%~17%,高轉速則降低11%~14%;bsfc與bsEC均較柴油增加。NOx排放較柴油降低24%~72%,黑煙排放則降低59%~79%。CO排放在低轉速較柴油降低18%~72%,但在高轉速大幅增加。HC排放在低轉速高負載較柴油降低71%,但在中高轉速增加84%~259%。
Dimethyl-ether (DME) is a new alternative clean fuel for diesel engines. The fuel system of a single-cylinder DI diesel engine is modified in this study. Engine bench tests are conducted for the blend fuel of DME and B1 diesel fuel to study the engine performance and exhaust emissions by changing the injection parameters. Experimental results show that the engine performance and exhaust emissions of blend fuel are worse than diesel fuel. When using an enlarged plunger with 1.52 times of plunger displacement, and a fuel injector with 1.69 times total nozzle area, the engine performance and exhaust emissions of blend fuel are greatly improved. For D30 blend fuel, best results are obtained under the original setting of injection timing. The full-throttle brake torque of D30 fuel is higher than diesel fuel. Althouth the bsfc increases, the bsEC of D30 fuel is lower than diesel fuel. Compared with diesel fuel, the NOx emission decreases by 14~67%, the smoke level decreases by 23~46%, while the HC emission increases by 17~70%. The CO emission decreases by 15~83% at low engine speed, but increases by 25~194% at high speed. Best results of D70 blend fuel are obtained under a slightly-retarded injection timing 13°bTDC and a lowered injection pressure 157.4bar. The full-throttle brake torque of D70 fuel, compared to diesel fuel, increases by 15~17% at low enigine speed, but decreases by 11~14% at high ening speed. Both the bsfc and bsEC are higher than diesel fuel. Compared with diesel fuel, the NOx emission decreases by 24~72%, the smoke level decreases by 59~79%. Both the HC and CO emission decreases at low engine speed, but increases to a large extent at high engine speed.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0M97720025
http://ntour.ntou.edu.tw/ir/handle/987654321/13881
Appears in Collections:[機械與機電工程學系] 博碩士論文

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