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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EXPERIMENTAL STUDIES TO DETERMINE THE TIME CHARACTERISTICS OF RADIATION OF SHOCK-HEATED GASES IN DIFFERENT SPECTRAL RANGES

Natalia G. Bykova
Institute of Mechanics of Moscow State University, Michurinskiy prospect 1, 119192 Moscow, Russia

Igor E. Zabelinsky
Institute of Mechanics of Moscow State University, Michurinskiy prospect 1, 119192 Moscow, Russia

Pavel V. Kozlov
Institute of Mechanics of Moscow State University, Michurinskiy prospect 1, 119192 Moscow, Russia

Vladimir Yu. Levashov
Institute of Mechanics of Moscow State University, Moscow, Michurinskiy prospect 1, 119192, Russia

Oleg P. Shatalov
Institute of Mechanics of Moscow State University, Michurinskiy prospect 1, 119192 Moscow, Russia

DOI: 10.1615/IHTC16.rti.023491
pages 8355-8362


KEY WORDS: Radiation, Measurement and instrumentation, nonequilibrium thermal radiation transfer problems

Abstract

When calculating the thermal load on the surface of a landing spacecraft during its entry into the dense atmospheric layers, the physical-chemical processes near the spacecraft surface should be taken into account. Simultaneously a number of problems of physical-chemical mechanics and radiation gas dynamics associated with an increase in the reliability of predictive astrophysical models remain unsolved to date. These include the development of kinetic models of non-equilibrium ionization and models of relaxation and radiation processes as well as the solution of non-equilibrium thermal radiation transfer problems. At the same time, allowance for these processes is needed, because the influence of atomic lines for example on the radiative heating of the spacecraft surface may turn out to be significant. Experimental data on the emission of pure argon, oxygen of nitrogen and atmospheric air, behind the front of the shock wave are given in a wide spectral range in the presented study. For pure argon these experiments were made in the 4.5 to 7.8 km/s velocity range and the pressures ahead of the wave front of 0.25-5 Torr. The results of nitrogen monoxide molecule radiation in atmospheric air study were obtained in the 5 to 11 km/s velocity range and the pressures ahead of the wave front of 1-0.2 Torr. These experimental data give the possibility to construct more accurate kinetic models of non-equilibrium ionization and radiation processes behind the front of the shock wave.

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