Experimental study of NO_x emissions and injection timing of a low heat rejection diesel engine

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• 作者：Ekrem Buyukkaya ; Muhammet Cerit
• 关键词：LHR diesel engine ; Injection timing ; NO_x emissions ; Fuel consumption ; Equivalence ratio
• 刊名：International Journal of Thermal Sciences
• 出版年：2008
• 期刊代码：94_12900729
• 类别：et
• 出版时间：August 2008
• 卷：47
• 期：8
• 页码：1096-1106
• 文件大小：1183 K

摘要

In this study, an experimental study of the effects of injection timing on nitrogen oxide (NO_x) emissions of a low heat rejection (LHR) turbocharged direct injection diesel engine was conducted. The injection timing and brake specific fuel consumption (BSFC) trade-off must be considered together in performance and NO_x emissions analysis. For the original injection timing of the 20° before top dead centre, the brake specific fuel consumption value of the LHR engine was approximately 6%lower than the original engine. NO_x emissions were also higher (about 9%) than the original engine. To reduce NO_x emissions released by diesel engines, the method of injection timing retard was utilized. Thus, the LHR engine was tested for two different injection timings; 18° and 16° crank angle before top dead centre (BTDC), at the same engine speeds and load conditions. The results showed that the BSFC and NO_x emissions were reduced 2%and 11%, respectively by retarding the injection timing. Optimum injection timing for the LHR engine was obtained through decreasing by 2° BTDC.