Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2826
標題: 含水丁醇、噴油正時及廢氣再循環對柴油引擎燃燒特性之影響
Investigation on the Effects of n-Butanol Blends, Injection Timing and EGR on the Combustion Characteristic of Diesel Engine
作者: 陳以松
Chen, Yi-Sung
關鍵字: 氣缸壓力量測
Cylinder pressure measurement
熱釋放率
丁醇
噴油正時
廢氣再循環
Heat release rate
Butanol
Injection Timing
EGR
出版社: 機械工程學系所
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摘要: 近期柴油車汙染排放問題越來越受到關注,尤其是在2012年六月十二日世界衛生組織 (WHO) 正式把柴油引擎廢氣歸列為致癌物後,世界各國為保障民眾的健康紛紛的推動制定更嚴格的標準,對柴油引擎廢氣排放來加強管制。在台灣由於使用超過十年以上的老舊柴油車數量仍為數不少,因此為管制及降低行駛中老舊車輛的汙染排放,勢必對車輛加裝排氣後處理系統,但由於後處理系統價格居高不下,且車輛殘值偏低,導致多數車主的安裝意願不高,而使這些車輛的汙染排放形成了汙染管控的缺口。因此本研究從技術面來切入,選擇高污染減量效率與低成本且成熟的三種技術,分別為含水丁醇混合柴油、噴油正時調整及廢氣再循環,並使用Hino W06E一期排放標準之引擎在動力計測試檯架上以歐盟ESC穩態測試之模式做初期試驗,並藉由燃燒分析來判定引擎的燃燒穩定性及使用於舊型引擎的可行性。 在本研究中另外新建置了廢氣循環再燃燒(EGR)系統與缸壓量測擷取系統,用以進行含水丁醇混合柴油、噴油正時及廢氣再循環燃燒分析的個別試驗。從三種不同的燃燒控制方式,所獲得的實驗結果顯示,首先以運轉穩定度的指標來看,燃燒循環變異量最大均不超過7%,就引擎性能的變化而言,比較IMEP與BMEP之結果顯示,在IMEP中以EGR10%的下降幅度最高,BMEP則以WBT20下降最多,其次為EGR10%。在指示功(Wi)的輸出上則以EGR10%的下降幅度為最高,約為10.8%,在制動功(Wb)中下降幅度最高則為WBT20的7.7%,其次為EGR10%的6.7%。經綜合比較,引擎受EGR的燃燒控制方式造成輸出功降低的影響變化較大,而含水丁醇混合柴油的影響則較低。
Pollutions from diesel engines are globally awared currently. The World Health Organization (WHO) has officially classified diesel engine emissions as one carcinogen. Many countries have promoted more stringent emission regulations on diesel vehicle in order to protect public health. There are many diesel vehicles that are over ten year old are still in use in Taiwan. To diminish the exhaust pollutions from these old vehicles, exhaust after-treatment systems are utilized. However, the system is expensive and the scrap value of used vehicles is low, the promotion is still pending and not attractive to the public. Diesel engine emissions still exist. This study aims to make available of high efficiency and low cost pollution reduction strategy for Diesel engines. The use of n-butanol blended fuel, exhaust gas recirculation (EGR) and adjusting injection timing are the strategies to improve combustion characteristics and reduce emission. The bench test consists of Hino W06E diesel engine coupled with a dynamometer. The experimental testing is under the compliance with ESC standards. Cylinder pressure variations and the associated combustion analysis were used to appraise the stability of engine combustion and to evaluate the feasibility of the strategies used to reduce the engine emission. The coefficient of variance (COV) was chosen as the stability index in this study, and its value was limited within 7%. Results of experiments showed that the most IMEP reduction occurred for the case of EGR 10%, and the reduction in indicated work was 10.8%.The most reduction in BMEP occurred for the case of butanol 20%, and the reduction in brake power was 7.7%. In general, EGR may cause more deterioration in engine performance than that of butanol blend.
URI: http://hdl.handle.net/11455/2826
其他識別: U0005-2008201314154000
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2008201314154000
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