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디젤 엔진의 분사각 변화가 배기가스에 미치는 영향에 관한 수치해석적 연구
배명직(Myungjik Bae),이병화(Byounghwa Lee),한동식(Dongsik Han),전충환(Chunghwan Jeon),장영준(Youngjune Chang),송주헌(Juhun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In order to reduce NOx and Soot emissions simultaneously , characteristics of diesel spray and combustion were investigated by numerical simulation with StarCD in this paper. This work focuses on effect of Spin Injection. A simulation model of combustion, spray and emissions is developed for heavy duty marine diesel engine application. Simulation is performed with change of spray angle between first and second directions at fixed engine speed, injection timing, injection duration and etc. The results show that Spin Spray Injection method can reduce NOx emission. And the results show that the 1st injection considerably interfere with 2nd injection characteristics.
선박용 디젤 엔진에서 Pilot 분사에 대한 연소 특성 연구
이병화(Byounghwa Lee),배명직(Myungjik Bae),한동식(Dongsik Han),전충환(Chunghwan Jeon),장영준(Youngjune Chang),송주헌(Juhun Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Multidimensional simulation has been carried out to be clear the role of initial combustion in a marine diesel engines on reduction of NOx and soot emissions by different pilot injection condition. Pilot injection can shorten the ignition delay, thus it reduces the premixed combustion phase. Since most NOx is formed during premixed combustion, pilot injections is one of reliable strategies to reduce the NOx. The formation of NOx consists of that formed by pilot injection and that formed by main injection. The result explains that 25-3-75 among the pilot injection conditions is effective to reduce the NOx, due to optimal combination pilot injection with main injection. The purpose of this study is to explain the characteristics of combustion with pilot injection of the marine diesel engine on reduction of exhaust emissions by examining the combustion process in a cylinder and to explore the formation mechanism of NOx between pilot injection and main injection.