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초음파 연료 공급장치를 사용한 디젤자동차의 주행성능에 관한 연구
신현동(H. D. Shin),설진호(J. H. Seol),남승덕(S. D. Nam),류정인(J. I. Ryu) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
The utrasonic fuel feeding system was developed to enhance the driving performance and to reduce the smoke.<br/> From the experiments of chassis dynamometer test and driving test of diesel vehicle. the vehicle by using the ultrasonic fuel feeding<br/> system has more advatages of low BSFC. low smoke and high power.
수직관에서 2상선회유동이 보이드분포와 압력강하에 미치는 영향
김인석,손병진,신현동,곽기태,Kim, I.S.,Son, B.J.,Shin, H.D.,Kwack, K.T. 대한설비공학회 1989 설비공학 논문집 Vol.1 No.2
This experimental investigation has been conducted to determine the effects of swirling angle and flow patterns on distributions of void fraction, bubble velocity and two-phase pressure drop in a vertical straight tube. Swirling angles of $0^{\circ}$ (non swirling), $30^{\circ}$, and $45^{\circ}$ were tested with air-water two components over a range of superficial air velocities. A transparent lucite tube of 38mm in internal diameter was used for the test section. The void fraction and bubble velocities were measured by means of a optical fiber probe at the upper part of the swirler in the test section. Pressure drops which seem to be closely related with flow patterns and swirling angle were measured by a differential pressure transducer. It is shown that the probability density functions of pressure drop demonstrate peculiar features for both swirling angles and flow patterns, whereas the distributions of void fraction and bubble velocities are parabolic and flat shape in the vicinity of tube center, respectively except bubbly flow in any swirling angle cases, and the void fraction increases with increasing swirling angle around the center of tube.
김진국(J.K.Kim),신현동(H.D.Shin) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Premixed turbulent combustion can be regarded as a rapid chemical reaction taking place in a turbulent field. Therefore the structure of premixed turbulent flames is<br/> influenced by both the chemical properties of the mixture and the characteristics of the turbulence. In this work. the turbulence intensity and the turbulent time scale are<br/> controlled by the acoustic excitation with a loudspeaker. The relation between the turbulence intensity and the flame propagation velocity is indirectly indicated by the<br/> flame position and the flame extinction is explained with the flame stretch rate.<br/>
Helmholtz 공명기 내부를 전파하는 비정상 충격파의 수치해석
이영기(Y.-K. LEE),권용훈(Y.-H. KWEON),신현동(H.-D. SHIN),김희동(H.-D. KIM),靑木俊之(T. AOKI) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
When a shock wave propagates into a Helmholtz resonator, very complicated wave phenomena are formed both inside and outside the resonator tube. Shock wave reflection, shock focusing phenomena and shockvortex interactions cause strong pressure fluctuations inside the resonator, consequently leading to powerful sound emission. In the present study, the wave phenomena inside and outside the Helmholtz resonator are, in detail, investigated with a help of CFD. The Mach number of the incident shock wave is varied below 2.0 and several types of resonators are tested to investigate the influence of resonator geometry on the wave phenomena. A TVD scheme is employed to solve the axisymmetric, compressible, Euler equations. The results obtained show that the configuration of the Helmholtz resonator significantly affects the peak pressure of shock wave focusing, its location, the amplitude of the discharged wave and resonance frequency.
Reducing technology of fuel-NOx generation using fuel-rich/-lean catalytic combustion
S.K. Kang(강성규),S.J. Lee(이승재),I.S. Ryu(유인수),H.D. Shin(신현동),H.S. Han(한헌식) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
A two-step fuel-rich/fuel-lean catalytic combustion seems to be one of the most effective methods to control simultaneously the NO generation and the hydrocarbon (HC) conversion from fuel-bound nitrogen. By controlling equivalent air ratio for maintaining fuel-rich and fuel-lean condition over each catalytic layer, space velocity, inlet temperature, and catalyst component, the HCand ammonia conversion efficiency higher than 95% could be achieved, with ammonia conversion to NO remaining below 5%. The experimental results wouldbe applied to the combustion of land fill gas and to gasified refuse-derived fuels as a method of minimizing NO generation.