Investigation of the impact of biodiesel fuelling on NOx emissions using an optical direct injection diesel engine

被引:159
作者
Cheng, A.S. [1 ,3 ]
Upatnieks, A. [2 ]
Mueller, C.J. [2 ]
机构
[1] School of Engineering, San Francisco State University, San Francisco, CA
[2] Combustion Research Facility, Sandia National Laboratories, Livermore, CA
[3] School of Engineering, San Francisco State University, San Francisco
关键词
Adiabatic flame temperature; Biodiesel; Cetane number; Lift-off length; NO[!sub]x[!/sub; Optical engine; Soot radiation;
D O I
10.1243/14680874JER05005
中图分类号
学科分类号
摘要
The impact of biodiesel fuelling on NOx emissions was investigated using an optically accessible diesel engine. A soy-based biodiesel (B100) and three separate primary reference fuel (PRF) blends were evaluated over a range of loads at an engine speed of 800 r/min. Experimental operating conditions were carefully controlled to maintain a constant start of combustion (SOC), and a PRF blend was identified that would eliminate differences in premixed-burn fraction. A load-averaged NOx increase of ∼10 per cent was observed for B100 relative to the PRF blend with matched premixed-burn fraction. The results indicate that factors other than SOC and premixed-burn fraction affect the tendency for biodiesel to increase NOx. Equilibrium calculations reveal no significant differences in stoichiometric adiabatic flame temperature between the test fuels; however, experimental data suggest that actual flame temperatures may be influenced by differences in soot radiative heat transfer. The effect of biodiesel on mixture stoichiometry at the lift-off length may also play an important role in increasing NOx emissions. © IMechE 2006.
引用
收藏
页码:297 / 318
页数:21
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