Estimating the Thermal State of a Screen Acting as Protection from Radiation Emitted by a Hot Gas Jet

Authors: Eliseev V.N., Babarykin E.I. Published: 02.08.2018
Published in issue: #4(121)/2018  

DOI: 10.18698/0236-3941-2018-4-37-46

Category: Aviation and Rocket-Space Engineering | Chapter: Aerodynamics and Heat Transfer Processes in Aircrafts  
Keywords: screen, protection, radiation, thermal state, gas, insulation, structure

Today's engineers widely use screens as means of protecting various devices and organisms from detrimental effects of electromagnetic radiation. We stated and solved the problem of determining the thermal state of a thermally insulated flat metal screen. We present an example case of determining the heat flow absorbed that comes in the form of radiation emitted by an engine jet. Our computations revealed that the heat flow absorbed by the screen depends on the jet flare angle as it leaves the nozzle when the angle is over 10°. We computed the thermal state of a screen represented by a double-layer plate. One of the layers is a sheet of metal with a coating that reflects the incident radiation well; the other layer consists of insulation. The equations we obtained for estimating the temperature field over the screen are useful at the preliminary design stage for selecting screen material and structure


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