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4밸브 디젤기관의 흡기포트 형상에 따른 실린더 내 편심 선회유동 특성에 관한 실험적 연구
이지근(J. K. Lee),김덕진(D. J. Kim),강신재(S. J. Kang),노병준(B. J. Rho) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.1
This experimental study was carried out to investigate the characteristics of the in-cylinder ecswirl flow generated by a 4 valve cylinder head with a tangential and a helical intake port. The measurements of the in-cylinder velocity field have been made by a two-channel LDA system. The mean flow coefficient(CrrmO.,)), swirl ratio(R,) and mass flowrate with valve eccentricratios and an intake port partition between the two intake ports were measured in the steady flow test rig using the ISM (impulse swirl meter). The experimental results indicated that the mass flowrate through the tangential intake port was 19% and 7.7% more than that of the helical inport in case of with and without intake port partition respectively. There was a tendency to be a single rotation flow in swirl flow fields formed by a 4 valve cylinder head because of the inbetween the two intake ports. As the intake port partition was not set between the two intake ports. the increase of swirl ratio(R,) was 49.5%. while the decrease of mean flow coeffiwas 7.35%.<br/>
흡기다기관 형상변화가 3기통 LPG엔진의 토크 특성에 끼치는 영향에 관한 실험적 연구
이지근(J. K. Lee),이한풍(H. P. Lee),강신재(S. J. Kang),노병준(B. J. Rho) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.6
The purpose of this study is to investigate the effects of intake manifold shapes to improve the engine performance in a 3-cylinder LPG engine with a closed loop fuel supply system. To know the flow resistance of intake manifolds with shape, the intake negative pressure of each runner in in-take manifolds were measured by using the digital pressure meter at each driving condition. And. the engine torque and power have been measured with an engine dynamometer while adjusting the optimal fuel consumption ratio with a solenoid driver.<br/> As the results from this experiment, the torque characteristics were more improved with the ple-num chamber(B type intake manifold) than with the banana type(A type intake manifold). The torque characteristics were improved at mid-engine speed(rpm) range as the inner diameter of the intake manifold became smaller. And also the optimum volume among the examined plenum cham-ber volume was 0.74 times(590cc) the displacement of the test engine.<br/>
4밸브 디젤기관의 흡기포트 편심이 실린더 내 선회비 특성에 끼치는 영향에 관한 연구
이지근(J. K. Lee),강신재(S. J. Kang),노병준(B. J. Rho) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.5
The effects of intake port eccentricity on the characteristics of in-cylinder swirl ratio in a 4-valve diesel engine having the two intake ports; one is a helical intake port and the other is a tan-gential intake port were investigated by using the ISM(impulse swirl meter) in steady flow test rig. Swirl ratio(R_s) and mean flow coefficient(C_f(mean)) with valve eccentricity ratio(N_y) and axial dis-tance(Z/B)were measured.<br/> As the results from this experiment, the characteristics of in-cylinder swirl ratio formed by a 4-valve cylinder head were largely affected by intake port eccentricity. There is a difference in the mass flowrate through the two intake ports, and the mass flowrate through the tangential intake port is 19% more than that of the helical intake port. Therefore, we could know that the effects of the mass flowrate ratio through each intake port besides intake port shape should be considered.<br/>
나선형 흡기포트의 편심율 변화에 따른 실린더 내 선회비 특성에 관한 실험적 연구
이지근(J. K. Lee),주봉철(B. C. Joo),강신재(S. J. Kang),노병준(B. J. Rho) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
The effects of valve eccentricity ratio on the characteristics of in-cylinder swirl flow formed by a helical intake port were investigated in the steady flow test rig using the ISM (impulse swirl meter). The swirl ratio and mean flow coefficient with the variation of valve lift and valve eccentricity ratio were measured.<br/> Swirl ratio(R,) increases as the valve eccentricity ratio increases in the X-direction. But in the variation of positive Y -direction, it increase a little in comparison with that of X -direction. And also it decrease with the increase of valve eccentricity ratio in the negative Y -direction.<br/> In the comparison of the swirl ratio distribution, the helical port A used in this experiment show the same trend as the steep ramp helical intake port.<br/>
밸브 타이밍 변화가 3기통 LPG 엔진의 성능과 Idle 특성에 미치는 영향에 관한 연구
이지근(J. K. Lee),이한풍(H. P. Lee),노병준(B. J. Rho) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.3
The effects of the intake and exhaust valve timing to improve the engine performance in a spark ignition 3-cylinder LPG engine with a colsed loop fuel supply system were studied. The engine torque and power have been measured using the 75kW EC-dynamometer while adjusting the optimal fuel consumption ratio with a solenoid driver.<br/> As the results from this experiment, when intake valve opening is 12° BTDC, intake valve closing is 36° ABDC, exhaust valve opening is 12° ATDC, and exhaust valve closing is 36° BBDC respectively, the best torque characteristics in low and high speeds for a given engine were ob-tained. And also we could find that the torque characteristics in low speeds were affected by the timing of exhaust valve open. An increased valve overlap by means of the EVC delay was ineffec-tual to the torque characteristics improvement in high speeds.
나선형 흡기포트에 의한 cylinder내의 편심 선회 유동특성에 관한 연구
유경원(K.W. YOU),이지근(J.K. Lee),강신재(S.J. Kang),노병준(B.J. Roh) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This experimental study was mainly investigated on the eccentric swirl flow characteristics in the cylinder by a helical intake port. LDA system was utilized for the measurement of velocity fields and data were treated by an on-line computer analyzing system. Mass flowrate and angular momentum were calculated with respect to axial distance.<br/> As the results from this experiment there is a recirculation zone in the region of the cylinder head and decreases with axial distance. In the calculation of angular momentum in the region of cylinder head using the measured velocity profiles, flowrate must be accurately calculated.<br/>
4밸브 디젤엔진의 흡기포트 형상이 실린더 내 편심 선회유동 특성에 끼치는 영향에 관한 연구
김덕진(D.J.Kim),이지근(J.K.Lee),강신재(S.J.Kang),노병준(B.J.Rho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
This experimental study was carried out to investigate the characteristics of the in-cylinder eccentricity swirl flow generated by a 4 valve cylinder head with a tangential and a helical intake port. The measurements of the in-cylinder velocity field have been made by a two-channel LDA system. The mean flow coefficient(C_f(mean)), swirl ratio(Rs) and mass flowrate with valve eccentricity ratios and an intake port partition between the two intake ports were measured in the steady flow test rig using the ISMCimpulse swirl meter). The experimental results indicated that the mass flowrate through the tangential intake port was 19% and 7.7% more than that of the helical intake port in case of with and without intake port partition respectively. As the intake port partition was set between the two intake ports, the increase of swirl ratio(Rs) was 49.5%, while the decrease of mean flow coefficient(C_f(mean)) was 7.35%.<br/>
분체 이송용 Ejector System의 성능에 관한 설계변수의 영향
이윤권(Y. K. Lee),김금규(K. K. Kim),강신명(S. M. Kang),이지근(J. K. Lee),노병준(B. J. Rho) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The Effects of design parameters on the transport performance of the ejectors which is widely used in a production process of automotive parts were investigate experimentally. The primary nozzle geometry, the ratio (R) of nozzle exit cross-sectional area to mixing chamber cross-sectional area and the distance (S) from primary nozzle exit to mixing chamber entrance were considered as the design parameters. They were determined to run with high-efficiency by measuring the transport rate of the solid particle. The nozzle geometry and the area ratio (R) affected greatly on the ejector performance, and in particular, the area ratio (R) should be carefully selected after taking the minimum fluidization velocity of applied solid particle into account. The effects of the distance (S) on the ejector performance presented different tendency between the solid particle transport and the air transport.