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공기유입을 고려한 2 유체 분무의 구조에 관한 실험적 연구
채효철(H . C . Chae),김동일(D . I . Kim),오상헌(S . H . Oh) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.1
The effect of air entrainment in twin-fluid spray structure is investigated experimentally by oaring the amount of atomizing air. The air entrainment is expected to affect on droplet size and velocity, droplet number density, turbulent kinetic energy and vorticity. PDA(Phase Doppler Anemometer) and PIV(Particle Image Velocimetry) system are used to measure those important factors in analyzing spray structure. The results show that spray structure consists of three distinctive regions ; the atomizing region near nozzle, characterizing strong convective effect, the central core region where droplets are accelerated, and the spray sheath region where droplets are decelerated due to air entrainment. The local sir entrainment rate is largest near noule, characterizing strong turbulent kinetic energy and vorticity but deceases along the downstream. However, the air entrainment rate linearly increases along axial distance.
분열을 고려한 비연소 분무 유동장에 대한 수치해석적 연구
김경수(K.S.Kim),김동일(D.I.Kim),오상헌(S.H.Oh) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
The dispersion of liquid drops in a spray is very important in many industrial process. In fact, injector performance in known to affect strongly engine operation. One of the key processes affecting spray behavior is atomization, the process whereby the injected liquid is broken into drops. In spite of the importance of atomization, the mechanisme of liquid breakup are still not well understood.<br/> In this study, computations are carried out using a PC with breakup submodel(WAVE breakup model). Spray flow issued from the air blast atomizer were claculated using the spray characteristics in the vicinity of the atomizer obtained by experiment^⑴. The numerical calculation of a sray flow was made with an Eulerian formulism to continuous phase such as air, and an Lagrangian formulism to dispersed phase which is the particle such as drop. Turbulent dispersion effects were numerically simulated using statistical methods.<br/> Through computational calculations, we obtained the data about the distribution of gas velocity, turbulent kinetic energy, and drop velocity.<br/>
노정걸(J.G.Roh),차강욱(K.W.Cha),전충환(C.H.Jeon),장영준(Y.J.Chang),오상헌(S.H.Oh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this experimental study, the effects of injection timing on the performance in a four stroke cycle spark-ignition engine have been investigated. In order to asses the engine response characteristics, performance parameters such as air-fuel ratio, output torque and emissions were measured under the part-load condition. The influence of fuel injection timing on the operation stability was observed. Results show, as the fuel is injected during intake stroke, deteriorated volumetric efficiency and hence lower engine performance.<br/>