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Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용(J. Y. Yoon),성낙원(N. W. Sung) 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
The discharge coefficient in segmental wedge having ninety degrees vertex angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured .main purpose of this work is placed on developing the proper form of an equation for the discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and from thata six-term equation which can express the variability of opening ratios was developed. The same assumption and hypotheses were used and tested for all procedures as conventional differential producers; however, the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated the Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000, the resulting equation for the discharge coefficient is relatively simple; it contains only one variable-opening ratio because the characteristic of discharge coefficient of segmental wedge has little connection with the Reynolds number as shown by previous studies.
최재식(J.S.Choi),성낙원(N.W.Sung) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
A flow model for the intake manifold of an engine was developed by the method of characteristics. The flow model was for l-D, unsteady, non-isentropic compressible flow. The accuracy of the model depends on the boundary conditions in the open end and branches. From this model, the effects of both intake and exhaust valve timings on the mass flow rate into a cylinder were tested and optimum valve timings were verified.<br/>
성낙원(N.W.Sung),정용일(Y.I.Jeong),박신현(S.H.Park) 한국자동차공학회 1987 오토저널 Vol.9 No.5
The control technique for an electronic engine is studied. For this study an IBM-PC and a throttle body fuel injection system are selected. The computer controls fuel injection, spark timing, exhaust gas recirculation and idle speed. Fuel injection is adjusted either by a feedback signal of a zirconia O₂ sensor or programmed logic for starting, acceleration, deceleration, warming up and idle modes. When a 3-way catalytic converter is used with the electronic engine control system, CO, THC, and NOx were reduced more than 90% simultaneously.
[論文] 국산 가솔린 엔진용 저배기공해 System에 관한 연구
성낙원(N. W. Sung),정용일(Y. I. Jeong),박신현(S. H. Park),우세종(S.J. Woo) 한국자동차공학회 1986 오토저널 Vol.8 No.3
In this study, low emission gasoline engine system is developed utilizing an EGR valve, 3 way catalytic converter and electronic fuel injection system. EGR was controlled by a needle valve and optimized at the engine conditions. Throttle body fuel injection system is used for fueling. When the engine was operated at constant speed by the electronic engine control system with the 3 way catalytic converter, the emissions were reduced by 50 to 90% in volume depending on the engine operating conditions.
동적모사장치를 이용한 2-행정기관의 소기효율 정량화 연구
황정성(J.S.Hwang),이진욱(J.W.Lee),강건용(K.Y.Kang),정용일(Y.I.Jeong),이상수(S.S.Lee),성낙원(N.W.Sung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_2
Two-stroke engine has advantages over four-stroke engine of greater torque and power, less torque fluctuation and more compactness. At the same time. it has main drawback of the short circuiting flow and excessive oil consumption. In these days, however, the oil consumption problem has been solved by adapting poppet valve system instead of port type. For the mid step of this research. in order to ultimately optimize scavenging process using RSSV(rotatable shrouded scavenging valve) system, which has been patented by our research group, the experiment of scavenging efficiency evaluation is performed by using dynamic simulator. The experimental results match up to the former results of flow visualization and steady simulator. Keywords' Two-Stroke Engine, Scavenging Process. RSSV, Dynamic Simulator.<br/>
Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용,성낙원,Yoon J.Y.,Sung N.W. 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.3
The discharge coefficient in segmental wedge haying ninety degrees yeller angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.