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On the Evaporation and Ignition of Kerosene Fuel Droplet
Qasim Sarwar Khan(카심 살월 칸),Seung Wook Baek(백승욱),Hojat Ghassemi(호잿 가세미) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In the present study, the evaporation rates and ignition delay times of kerosene were investigated at high temperatures (between 800 and 1100 K) and high pressures (between 0.1 and 2.0 ㎫) under normal gravity. Droplet with an initial diameter of 1.0 to 1.4 ㎜ hanging at the tip of quartz fiber was subjected under high ambient conditions suddenly. The vaporizing/burning process was recorded through a CCD camera and evaporation history is thus evaluated through temporal variation of droplet diameter. The results show a reduction in ignition delay times upon increment of temperature and pressure. The evaporation follows d²-law and vaporization rates increases at high ambient temperature and pressure. The ignition delay time can be represented by the expression τ=AP<SUP>B</SUP>exp(D/T).
Khan, Qasim Sarwar,Baek, Seung Wook,Ghassemi, Hojat Gordon and Breach Science Publishers 2007 Combustion science and technology Vol.179 No.12
<P> The effects of high ambient pressure and temperature were experimentally investigated on the autoignition delay times of isolated kerosene fuel droplets. The droplet was hanged at the tip of a quartz fiber and suddenly exposed to high ambient temperature by the help of falling electric furnace at desired ambient pressures under normal gravity. The ignition was detected visually by the use of high-speed photography. Results have shown that the autoignition delay time decreases with an increase in both temperature and pressure. Also an increase in ambient pressure reduces the ignition location distance from the droplet. The experimental results of autoignition delay times were correlated with the equation &tgr; = APBexp(D/T). The combustion of the kerosene droplet was also investigated at various ambient temperatures and at atmospheric pressure. The droplet burning rate was calculated using temporal histories of droplet diameter. The droplet combustion followed d2-law. And a comparison between evaporation and burning rate constants has shown that their difference reduces at higher ambient temperatures.</P>
김희경(H.K. Kim),김태영(T.Y. Kim),서응렬(E.R. Seo),권명근(M.K. Kwon),Qasim Sarwar Khan,권오채(O.C. Kwon) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Effects of the port configurations on the performance of gas cooktop burners are experimentally studied. For various types and port configurations of burners, turn-down ratios, efficiencies and NO<SUB>x</SUB> emissions are evaluated and flames are visualized using OH<SUP>*</SUP> chemiluminescence. Results show that efficiencies are generally enhanced with increasing port exit angle and decreasing interval.