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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.
윤석주(S. J. Yoon),최영하(Y. H. Choi),김경훈(K. H. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Liquid atomization by means of a spinning cup is widely used as a device for combustion, in cooling and spray drying. In this study, the blowing type rotary atomizer was experimental carried out the investigations on the characteristics of the blowing type rotary atomizer which ?? an air flowenergy of blower instead of an electric motor most commonly used to a driven energy The analysis on the rotary cup speed. air velocity and air momentum with the blower conditions was performed and also the drop size was measured using LDPA. It was tried to analyzed on air-nozzle size and liquid feed-rate as the result. It was found that the increase of the relative velocity between liquid and air improve significantly atomization liquid. and decrease of the liquid feed-rate improved the maximum<br/> drop size though the mean drop size is really the same.<br/>
바이오 디젤 혼합율이 압력식 스월노즐의 분무 특성에 미치는 영향
윤석주 ( S. J. Yoon ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.4
This paper presents the spray characteristics of the gun type burner nozzle with bio-diesel blending rate. The burner nozzle used in this experiment is a pressure swirl type nozzle. For the spray characteristics, visualization of spray was conducted to obtain the spray angle, and laser diffraction spectroscope (LDS) was used for the measurement of the droplet diameters. The results showed that the Dmax, SMD and spray angle were decreased with increasing the bio-diesel blending rate and BD30 (30% bio-diesel blending rate) could be found to be the maximum blending rate for using without any modification of the gun type burner of the homesize kerosene fuel boiler.
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.