| Abstract: | The problem of a strong point explosion in an atmosphere with exponential dependence of the density on the altitude was considered in detail in the monograph [1]. As the blast wave becomes weaker, it is necessary to take into account the counterpressure and the gravitational force. Then in the central hot region of the explosion the gas-dynamic processes are intensified, and the method of calculating the flow parameters in the neighborhood of the point of energy release becomes important. The singularity at this point can be eliminated by including dissipative factors in the treatment; it is then possible to use standard difference methods in the hot central region. In the present paper, the qualitative and quantitative effects of the counterpressure and gravitation are analyzed. A model of the explosion with a simple mechanism of energy dissipation — heat transfer by radiation — is considered. The calculations of the explosion are continued until the formation of the mushroom cloud. The results are compared with the data of other authors.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zfaidkosti i Gaza, No. 6, pp. 144–151, October–December, 1981. |
