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박장혁(J.H.Park),홍성태(S.T.Hong),구자예(J.Y.Koo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
The measurements of velocities of internal flow in a scaled-up nozzle were made by laser Doppler velocimetry in order to clarify the effect of internal flow on the characteristics of fuel spray. The investigated length to diameter ratio(Ud) of the orifice were 1,3.4,5, and 8 and inlet radius to diameter ratio ( r_ο/d) were 0 and 0.5. Mean and fluctuating velocities and discharge coefficients were obtained at various Reynolds number raging between 15,000 and 28,000, and L/d raging between 1 and 8 in sharp and round inlet nozzle. The turbulent intensity and turbulent kinetic energy in a sharp inlet nozzle were higher than that in a round inlet nozzle. For sharp inlet nozzle, fluctuating velocities near exit were decreased with increasing L/d.<br/> <br/> <br/>