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한조영,백승욱 대한기계학회 1995 대한기계학회논문집 Vol.19 No.9
The ignition phenomena of a solid fuel plate of polymethyl-methacrylate(PMMA), which is vertically positioned and exposed to a thermal radiation source, is numerically studied here. A two-dimensional transient model includes such various aspects as thermal decomposition of PMMA, gas phase radiation absorption, gas phase chemical reaction and air entrainment by natural convection. Whereas the previous studies considers the problem approximately in a one-dimensional form by neglecting the natural convection, the present model takes account of the two-dimensional effect of radiation and air entrainment. The inert heating of the solid fuel is also taken into consideration. Radiative heat transfer is incorporated by th Discrete Ordinates Method(DOM) with the absorption coefficient evaluated using gas species concentration. The thermal history of the solid fuel plate shows a good agreement compared with experimental results. Despite of induced natural convective flow that induces heat loss from the fuel surface, the locally absorbed radiant energy, which is converted to the internal energy, is found to play an important role in the onset of gas phase ignition. The ignition is considered to occur when the rate of variation of gas phase reaction rate reaches its maximum value. Once the ignition takes place, the flame propagates downward.
영국산 화학추진시스템의 기술이력과 통신해양기상위성 이원추진제 추진시스템
한조영,HAN, Cho Young 항공우주시스템공학회 2008 항공우주시스템공학회지 Vol.2 No.1
The technology relevant to a bipropellant propulsion system is quite new one in Korea, which is being transferred for the first time, with development of COMS propulsion system. It hasn't ever attempted before, and hasn't got any general idea itself as well, in Korea. The technical heritage of UK bipropellant propulsion pertinent to COMS propulsion system is scrutinised mainly. Furthermore the strong possibility of COMS CPS for the moon explorer mission is rationalised on the basis of the history of successful predecessors.
한조영 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
Natural convection of an electrically conducting fluid in a square cavity under an externally imposed magnetic field is investigated numerically. The two opposing side walls are differentially heated with a temperature difference specified, while the floor and ceiling are adiabatic. The coupled momentum and energy equations associated with the electromagnetic retarding force, as well as the buoyancy force terms, are solved by an iterative procedure using the SIMPLER algorithm based on the control volume approach. The changes in the buoyant flow patterns and temperature distributions due to the tilting of a cavity are mainly addressed. The effects of various controlling parameters on fluid flow and associated heat transfer are examined. Natural convection of an electrically conducting fluid in a square cavity under an externally imposed magnetic field is investigated numerically. The two opposing side walls are differentially heated with a temperature difference specified, while the floor and ceiling are adiabatic. The coupled momentum and energy equations associated with the electromagnetic retarding force, as well as the buoyancy force terms, are solved by an iterative procedure using the SIMPLER algorithm based on the control volume approach. The changes in the buoyant flow patterns and temperature distributions due to the tilting of a cavity are mainly addressed. The effects of various controlling parameters on fluid flow and associated heat transfer are examined.