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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.