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조대진(D.J.Cho),윤석주(S.J.Yoon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
An experiment on the fuel breakup characteristics of gasoline pintle type injector has been carried out in this paper. PDPA and PMAS systems were used to measure the drop size produced at injector. In order to clarify breakup characteristics at surrounding intake valve, measuring points are located in axial direction 100mm from the injector tip. The results by PMAS system compare with results by PDPA system.<br/>
고동국 ( D. G. Ko ),조대진 ( D. J. Cho ),윤석주 ( S. J. Yoon ) 한국분무공학회 2003 한국액체미립화학회지 Vol.8 No.1
N/A The flow analysis of the axial fan of rotary burner was performed by SIMPLE(Semi Implicit Method for Pressure Linked Equations) algorithm and finite volume method performed in the case of 3-D, incompressible, turbulent flow. In this study, the coordinate transformation was adapted for the complex geometry of axial fan, and the standard κ-ε model and wall function method were used for analysis of turbulent flow. Multi-block grid system was used for flow field and divided into four domains such as the inlet, outlet, flow field of rotating vane, and tip clearance. Fan rotation was simulated by rotational motion using MRF(Multiple Rotating Reference Frame) in steady, incompressible state flow.
가솔린 자동차의 희박연소시스템 적용을 위한 연료공급 최적화에 관한 연구 (I) - 가솔린 인젝터의 연료분열특성에 관한 연구 -
윤석주,조대진,방두열,Yoon, S.J.,Cho, D.J.,Pang, D.Y. 한국액체미립화학회 1998 한국액체미립화학회지 Vol.3 No.3
In recently, a study on the lean combustion is investigated intensively, because it is expected that this method may decrease the harmful exhaust gas and improve fuel economy in gasoline engine. The problems of lean combustion system in gasoline engine are ignition difficulty, misfire and instability of combustion. The investigation on the optimization of fuel metering and the control of mixing gas flow may be critical to improve the performance of lean combustion. In the fuel injection gasoline engine, the formation of mixture influences strongly on the engine performance such that the importance of fuel metering system becomes apparent. First of all, a study on the fuel breakup characteristics of gasoline fuel injector was carried out in this paper. Fuel injectors are pintle and 4hole-2spray type. The purpose of this study is to clarify the atomization mechanism of spray injected into atomosphere field through electronic controlled-fuel injectors, and to analyze spray characteristics such as drop size distribution and mean drop diameter produced at fuel injector. In this paper, the spray development is observed by taking photograps using 80mm still-camera system, and drop sizes are measured by PMAS. From these experiment, spray pattern injected from gasoline fuel injectors was investigated clearly. Also, it was found that SMD and drop size distribution of injected fuel spray from gasoline fuel injectors.
김헌종(H.J.Kim),조대진(D.J.Cho),윤석주(S.J.Yoon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The swirl atomizer is widely used in domestic and industrial combustion systems. However, the information of the flow characteristics is not enough to design nozzles and to predict the spray characteristics. The velocity profiles at the exit is one of the most important factors to determine the spray characteristics. In this paper, a numerical analysis was made to investigate whether the nozzle geometry influences on the velocity profiles at the exit and the spray angle was calculated with the velocity profiles at the orifice. It was concluded that the geometrical properties of the nozzle were the most influential parameters to determine the flow characteristics and the calculated spray angles show good agreement to a set of measured spray angles.<br/>
윤석주 ( S. J. Yoon ),조대진 ( D. J. Cho ) 한국분무공학회 1999 한국액체미립화학회지 Vol.4 No.4
In the pressure swirl atomizer, the liquid is injected through tangential passages into a swirl chamber, from which it emerges with both tangential and axial velocity components to form a thin conical sheet at the nozzle exit. This sheet rapidly attenuates, finally disintegrating into ligaments and then drops. The purpose of this study is to measure the spray characteristics according to variation of viscosity of the spray produced by the pressure swirl atomizer. The nozzle tested here were especially designed for this investigation. The discharge coefficient is determined by measuring the volume flow rate with a flow meter and the cone angle of the liquid sheets issuing from the nozzle is obtained from series of photographs of the sheet for various liquid viscosity and injection pressure. And mean drop size is measured by image processing method. It is found that the geometrical characteristics of the nozzle and the variation of viscosity were the influential parameters to determine the spray characteristics such as the cone angle, discharge coefficients and SMD.