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고영성(Y. S. Ko),정석호(S. H. Chung) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.5
Characteristics of breakup of a liquid droplet impinging on a hot surface has been investigated experimen-tally by using decane fuel. Factors influencing droplet breakup are surface temperature, impinging velocity, droplet diameter and incident angle. Droplets impinging on a hot surface begins to breakup at 220-235°C. This temperature varies with impinging velocity, droplet diameter and incident angle. For wall temperature of 220-245°C and above 270°C, breakup probability increases as impinging velocity increases showing S shape curve. For 245-265°C, a local minimum heat transfer rate occurs. In this temperature range, breakup probability shows nonmonotonous behayjor as functions of impinging velocity. As droplet diameter decreases, impinging velocity required for droplet breakup increases. An optimum impinging angle for droplet breakup exists which are found to be about 75°.
모하메드 하산(H.Mohamed),고영성(Y.S.Ko),윤금중(K.J.Yoon),정석호(S.H.Chung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In this study, a new type of laser-induced ignition was developed. Without focusing laser beam, it was possible to ignite combustible mixtures by reducing the laser beam diameter to a small value and directing that beam into a small conical cavity. Shadowgraphs for the early stages of combustion process showed that a hot gas jet is ejecting from the cavity, especially when burning lean mixture. After a very short time, the hot gas jet had finished issuing and the flame behavior is quite similar to flame propagation initiated by a conventional spark plug. This type of ignition exhibits more rapid and a higher maximum pressure rise than center ignition with a significant decrease in the combustion duration. Also, the combustion process with this type of ignition was simulated using a part of KIVA-II and good agreement between experimental and calculated results of temperature distribution was obtained.<br/>
김명환,정석호,김동진,고영성,민대기 한국액체미립화학회 1996 한국액체미립화학회지 Vol.1 No.2
The structure of sprays from a simplex type pilot nozzle atomizer is studied experimentally by measuring velocities. Sauter mean diameter, and number density. Interaction of the spray with a gas-phase flow fieldgenerated from a 1MW range industrialists turbine combustor adopt ing a counter-swirler is investigated. Various spray behaviors are reported. Especially interest ing characteristics are the tangential motion of the spray and of the spray with swirl interaction. It shows a Rankine combined vortex type of velocity characteristics, having linear velocity profile inside the inner core where small particles exist and rapidly decreasing velocity profiles outside. Interacting spray has relatively uniform number density profiles compared to the nozzle spray itself.