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Fuel Rail의 설계 인자별 압력맥동 특성에 관한 연구
허형석(Hyungseok Heo),배석정(Sukjung Bae),이헌균(Heonkyun Lee),송경석(Kyungsuk Song),박시우(Seewoo Park),김보겸(Bokyoum Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In general, pulsation damper is installed in fuel rail for conventional MPI engine to decrease undesirable cabin noise. However, pulsation damper is so expensive that there are prevailing studies to reduce fuel pressure pulsations with integrated damping effect. This paper is one of basic studies for development of fuel rail to abate pulsations with self-damping effect. Primarily, the pressure pulsation characteristics was investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. A high aspect ratio or thin wall was found to absorb the pressure pulsations effectively. But volume effects on the fuel pressure pulsation reductions were not especially significant than cross section effects because volume increment rate is larger than pressure pulsation reduction rate. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure change period increases on the basis of same lengths of supply line and fuel rail as the volume is enlarged and/or the thickness of wall is thinned.
특성 방법을 이용한 Fuel Rail 압력맥동 특성 해석 프로그램 개발
배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),송경석(Kyungsuk Song),박시우(Seewoo Park),김보겸(Bokyoum Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the return less fuel rail system of MPI engine, pulsation damper is commonly mounted for the purpose of diminution of pressure pulsations and jarring noise. But, pulsation damper is too expensive for all the advantage. Therefore, the studies are on the increase to develop fuel rail to diminish pulsations with integrated damping effect. This paper deals with numerical approach using method of characteristics to design fuel rail to reduce pulsations with self-damping effect. Primarily, the pressure pulsation characteristics is investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. Secondarily, sweep test simulation of fuel rail for in-line engine is performed as engine speed increases to find out certain engine speed where pressure pulsation peak is observed. A high aspect ratio or thin wall is found to absorb the pressure pulsations effectively. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure pulsation peak is observed at the vicinity of certain engine speed where single-injector oil hammer simulation predicts that resonance would occur.