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심상철(Sang-cherl Sim),조태영(Tae-young Cho),정병국(Byong-koog Jung),송규근(Kyu-keun Song),정재연(Jea-youn Jung),김형곤(Hyung-gon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Harmful elements from the exhaust gases are caused by incomplete combustion of mixture inside the engine cylinder and this abnormal combustion like misfire or partial burning is the direct cause of the air pollution and engine performance degradation. In this study, I obtain the shapes of spark, voltage and current generated when changing the experimental parameters such as grounded electrode shapes, electrode gap and the material of center electrodes. After that, I produce ignition energy by using the voltage and current and classify ignition energy into capacitive discharge energy and inductive discharge energy.
정병국(Byong-koog Jung),심상철(Sang-cherl Sim),김형곤(Hyung-gon Kim),송규근(Kyu-keun Song),정재연(Jae-youn Jung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
An experimental study deals with a high-speed hydrogen jet diffusion flame ejected vertical1y upward from a straight circular nozzle. Consideration is given to the unstable combustion characteristics of hydrogen jet diffusion flames, such as split flames and reignition phenomenon. The split flames are composed of a small flamelet on the nozzle rim and a lifted main flame at downstream. When mass flow rates of fuel reach a critical point, a small-sized flame let is found to remain in the vicinity of the nozzle exit and the flame reignition subsequent to blowout of main flame occurs repeatedly. In this study, the non-luminous hydrogen jet diffusion flames are visualized by using schlieren technique in order to analyze the combustion characteristics of hydrogen jet diffusion flames with focus on the flame reignition phenomenon.
송규근(Kyukeun Song),김상민(Sangmin Kim),정재연(Jaeyeon Jung),심상철(Sang cherl Sim),김형곤(Hyunggon Kim) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
in this study. This experiments were performed the spray characteristics of diesel spray in common-rail system according to fuel temperature, injection pressure and spray time etc. Diesel have different spray patten due to injection pressure and spray time in common-rail system. A Filter pressure is influenced by fuel temperature which is turned to fuel viscosity related to a fluid flowing.