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자동차 헤드램프 세척용 재순환 챔버 노즐의 내부유동이 분무장에 미치는 영향
신정환 ( J. H. Shin ),이인철 ( I. C. Lee ),강영수 ( Y. S. Kang ),김종현 ( J. H. Kim ),구자삼 ( J. S. Koo ),구자예 ( J. Y. Koo ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.2
Atomized liquid jets from the washing nozzle which configured with recirculation chamber for cleaning hot-zone area are accelerated and impinged on the head lamp surface. Cleaning efficiency of head lamp can be increased with injecting washing fluids into the hot-zone area. Experimental and numerical studies with various design parameters were executed to reveal the relations between internal geometry and internal flow in the washing nozzle. Spray structures were fitted with each of the head lamp surfaces and spray nozzles were optimized to the spray pattern. The recirculation chamber induces a recirculation flow and can be decreased the pressures perturbation inside the chamber. Orifice determines the mass flow rate. When the diameter of orifice is excessively large, it showed an unstable spray pattern. As a nozzle exit angle increases, density distributions are separated with two section. Also, as a protrusion length of nozzle exit increases, spray patterns are spread into a large area and density distributions showed unstable trend.
액상부탄 간헐분무의 액적 크기 및 속도 측정과 최적 확률분포 연구
김종현 ( J. H. Kim ),김재욱 ( J. W. Kim ),구자예 ( J. Y. Koo ) 한국액체미립화학회 2000 한국액체미립화학회지 Vol.5 No.1
The characteristics of liquefied butane spray are expected to be different from conventional diesel fuel spray, because a kind of flash boiling spray is expected when the back pressure is below the saturated vapor pressure of the butane(0.23MPa at 298K). The ambient pressure was held at a pressure above(0.37MPa) and below(0.15MPa) the fuel vapor pressure. The axial velocities, radial velocities, and size distributions in butane sprays were measured with PDPA(Phase Doppler Particle Analyzer) system. The PDPA measurement showed a smaller SMD at the 0.15MPa chamber pressure, compared to the 0.37MPa case. Log-hyperbolic density function for the droplets size distribution can be fitted to the experimental results of a liquefied butane spray.
고정빈 ( J. B. Ko ),이관형 ( K. H. Lee ),구자예 ( J. Y. Koo ),전창수 ( C. S. Jeon ),문희장 ( H. J. Moon ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.3
N/A Characteristics of droplet vaporization at high ambient pressures and temperatures which are supercritical conditions is studied numerically by formulating one dimensional vaporization model in liquid dodecane and air. Modified Soave-Redlich-Kwong state equation is used to condider real gas effect. Non-ideal behavior of properties at near critical and supercritical conditions is considered in the high pressure condition. Characteristic spatial distribution of properties with various conditions of pressure and temperature is evaluated in order to understand vaporizing evolution.
박장혁(J.H.Park),홍성태(S.T.Hong),구자예(J.Y.Koo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The measurements of velocities of internal flow in a scaled-up nozzle were made by laser Doppler velocimetry in order to clarify the effect of internal flow on the characteristics of fuel spray. The investigated length to diameter ratio(Ud) of the orifice were 1,3.4,5, and 8 and inlet radius to diameter ratio ( r_ο/d) were 0 and 0.5. Mean and fluctuating velocities and discharge coefficients were obtained at various Reynolds number raging between 15,000 and 28,000, and L/d raging between 1 and 8 in sharp and round inlet nozzle. The turbulent intensity and turbulent kinetic energy in a sharp inlet nozzle were higher than that in a round inlet nozzle. For sharp inlet nozzle, fluctuating velocities near exit were decreased with increasing L/d.<br/> <br/> <br/>
[가솔린엔진] 레이저 회절법을 이용한 축대칭 분무 구조의 공간 분포 변환에 관한 실험적 연구
양승연(S.Y. Yang),이충훈(C.H. Lee),구자예(J.Y. Koo),정석호(S.H. Chung) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Abel transformation Fourier transformation and onion peeling method tomographically reconstructed spatially resolved liquid volume fractions from a set of line-of-sight laser diffraction measurements for axisymmetric sprays generated from a pintle-type gasoline injector. Spatially resolved liquid volume fractions classified into 32 size groups were translated into number density distributions and equivalent diameters which showed well evaporating characteristics of Sl engine fuel sprays. These data were also obtained from the phase Doppler measurements for the same sprays. The comparison between laseㄱ diffraction measurements and phase Doppler measurements at some spatial measurement points shows that Fourier transformation reconstructs more reasonable spatially resolved characteristics for axisymmetric sprays as well as for asymmetric sprays
횡단유동에서 분사하는 홀형노즐 액체제트의 분열 및 분무특성
조우진(W.J. Cho),이인철(I.C. Lee),황진석(J.S. Hwang),구자예(J.Y. Koo) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The spray characteristics of liquid jet injected into subsonic cross-flow were investigated experimentally. Droplet sizes were measured using PDPA and Image Express. The nozzle diameter was 0.5 ㎜, and its length-to-diameter ratios (L/D) ranged from 1 to 3. Experimental results indicate that the break-up of liquid jet is distributed by many mechanism that are surface wave, shear vortex, counter rotating pair vortex etc. Spray Characteristics are symmetry according to flow direction, and SMD was increased, after some distance, it was decreased with flow direction. SMD of spray from liquid jet is increased in accordance to liquid jet direction.