• Title/Summary/Keyword: 방향제

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양돈산업 발전방향에 대한 제언

  • Kim, Dong-Hui
    • The Korea Swine Journal
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    • v.10 no.11 s.111
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    • pp.44-47
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    • 1988

  • 양돈업의 제1단계로서 농가호당 300두(비육돈) 까지는 자유조정에 맡기고, 300-3,000두까지는 등록제, 3,000두 초과 규모는 허가제로 하고 1만두를 넘는 대규모 양돈농가의 규모는 1만두 규모로 축소조정토록 법이 아닌 시행령으로 규정해야 한다.

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A Numerical Simulation of Regenerative Cooling Heat Transfer Processes for the Liquid Propellant Rocket Engine (액체추진제 로켓엔진의 재생냉각 열전달과정 전산모사)

  • 서호원
    • Journal of the Korean Society of Propulsion Engineers
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    • v.2 no.3
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    • pp.54-61
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    • 1998

  • A numerical simulation is attempted for the regenerative cooling heat transfer processes of the liquid propellant rocket engine. The heat transfer from the combustion gases to the thrust chamber wall is called gas side heat transfer. This heat is conducted radially to the coolant through the carbon deposit and metallic wall of thrust chamber Finally, this heat is convected away by the coolant flowing along the passages in the thrust chamber. The equivalence of these three heat fluxes of the above processes is utilized to determine the coolant side wall temperature, gas side wall temperature and the heat flux. When the number and shape(width, height) of coolant passages, the shape(size) of thrust chamber, oxidant and fuel properties, coolant properties, oxidant/fuel mixture ratio, coolant inlet temperature, the thickness of carbon deposit formed along the thrust chamber wall during combustion are given, reasonable radial direction temperature distributions and heat fluxes along the thrust chamber axis are obtained.

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