20%棕櫚仁油甲酯添加在高級柴油中的混合燃料(PKME20)除能幾乎維持與純高級柴油燃料(PD)有相等的引擎性能外,其油耗稍遜於PD,而廢氣排放濃度則優於高級柴油中添加50%棕櫚仁油甲酯的混合燃料(PKME50)。另外,不同柴油引擎的燃料噴射壓力亦對引擎性能、油耗、廢氣排放等亦有影響,故本研究以不同的燃料噴射壓力來探討其影響的程度。經引擎實驗結果證明,較原柴油引擎燃料噴射壓力(19.6MPa)低之燃料噴射壓力(15.7 MPa),在不影響原引擎性能的條件下,能減低油耗3.70%、煙度6.14%及HC濃度6.11%的排放,但NOX濃度增加9.99%。另較原柴油引擎燃料噴射壓力高之燃料噴射壓力(24.5 MPa),則除影響引擎性能外,又會增加油耗4.03%、煙度22.71%及HC濃度19.14%的排放,但NOX排放濃度減低4.18%。
The blending fuel 20% PKME(Palm Kernel Oil Methyl Ester) with PD (PKME20) not only maintain mostly the engine performance as compared with using PD expect the slightly higher BSFC, but also improve the exhaust gas emissions as compared with using the blending fuel of 50% PKME with PD, Additionally, the engine performance, BSFC and exhaust gas emissions are also affected by different fuel injection pressure. Thus, this study focused on using different fuel injection pressure to investigate how much affection on diesel engine. Experimental results demonstrated that using lower fuel-injection pressure(15.7Mpa) than the one in original engine (19.6Mpa) as well as based on no influence on the engine performance can reduce BSFC 3.74%, the concentration of Smoke 6.14%, and the concentration of HC 6.11%, but the concentration of NOx is increased to 9.99%. Using higher fuel-injection pressure (24.5Mpa) than the original not only affected the engine performance, but also increased the BSFC 4.03%,the concentration of Smoke 22.71%, and the concentration of HC 19.14%. As for the concentration of NOX, it is decreased to 4.18%.
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