Physics
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975kosis..13..587p&link_type=abstract
Kosmicheskie Issledovaniia, vol. 13, July-Aug. 1975, p. 587-594. In Russian.
Physics
3
Ablation, Atmospheric Entry, Meteoroids, Planetary Atmospheres, Radiative Heat Transfer, Energy Dissipation, Equations Of Motion, Kinetic Energy, Meteoritic Damage, Tungusk Meteorite
Scientific paper
The motion of large bodies in planetary atmospheres is considered in the case of a high entry velocity. Data are presented concerning radiative heat exchange of such bodies, and it is shown that during intense radiative heating, ablation occurs by means of mixing with an external flow in a free boundary layer. An ablation equation is proposed, and its exact solution is obtained. Total atmospheric dispersion of a body's high initial kinetic energy is found to be possible only for a low-density body. The possibility of cratering on Venus is analyzed. It is shown that the basic features of the Tungusk event can be duplicated by the entry of a low-density (less than 0.01 g/cu cm) body with the subsequent evaporation and disintegration of its gas cloud. It is concluded that the forest was knocked down in this event as a result of a shock wave released from the incoming body as a consequence of its very rapid deceleration.
Petrov G. I.
Stulov V. P.
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