|

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

References

[1] GOST12.1.005–88. Sistema standartov bezopasnosti truda (SSBT). Obshchie sanitarno-gigienicheskie trebovaniya k vozdukhu rabochey zony [State standard GOST12.1.005–88. Occupational safety standards system. General sanitary requirements for working zone air]. Moscow, Standartinform Publ., 2008. 49 p.

[2] Belov S.V., ed. Bezopasnost zhiznedeyatelnosti [Health and safety]. Moscow, Vysshaya shkola Publ., 2007. 616 p.

[3] Belyaev N.M., Ryadno A.A. Metody nestatsionarnoy teploprovodnosti [Methods of transient heat conduction]. Moscow, Vysshaya shkola Publ., 1978. 328 p.

[4] Lykov A.V. Teoriya teploprovodnosti [Heat conduction theory]. Moscow, Vysshaya shkola Publ., 1967. 600 p.

[5] Kartashev E.M. Analiticheskie metody v teploprovodnosti tverdykh tel [Analytical methods of heat conduction in solid bodies]. Moscow, Vysshaya shkola Publ., 1985. 480 p.

[6] Leontev A.I., ed. Teoriya teplomassoobmena [Heat and mass exchange theory]. Moscow, Bauman MSTU Publ., 1997. 684 p.

[7] Telegin A.S., Shvydkiy A.S., Yaroshenko Yu.S. Teplomassoperenos [Heat and mass transfer]. Moscow, Akademkniga Publ., 2002. 456 p.

[8] Zarubin V.S. Temperaturnye polya v konstruktsii letatelnykh apparatov. Metody rascheta [Temperature fields in aircraft construction. Calculation methods]. Moscow, Mashinostroenie Publ., 1966. 216 p.

[9] Dobrovolskiy M.V. Zhidkostnye raketnye dvigateli. Osnovy proektirovaniya [Liquid rocket engines. Principles of design]. Moscow, Bauman MSTU Publ., 2005. 488 p.

[10] Siegel R., Howell J.R. Thermal radiation heat transfer. McGraw‐Hill, 1972. 814 p.

[11] Rea S.N. Rapid method for determining concentric cylinder radiation view factors. AIAA Journal, 1975, vol. 13, no. 8, pp. 1122–1123. DOI: 10.2514/3.6964 Available at: https://arc.aiaa.org/doi/abs/10.2514/3.6964