SIMULATION OF A SYSTEM OF COMBINED HEAT SHIELD OF THE RADIATION-EVAPORATION TYPE

A mathematical model is proposed which describes heat and mass transfe r in a layer of outer high-temperature heat insulation and in the vapo r-removing channel of a system of radiation-evaporation heat shield. B asic regularities of the processes in question are considered, The eff ect of the thickness of the outer heat-insulating layer on the total w eight of the system of heat shield is investigated for a single set of values of its other parameters. It is shown, for a specific regime of variation of external heat flux and pressure, which simulates schemat ically a thirty-minute flight of a hypersonic aircraft with the maximu m value of the heat flux equal to 10(5) W/m2, that there exists a poss ibility to simultaneously reduce the thickness of the heat-insulation layer (by a factor of six) and the total weight of combined heat shiel d by a factor of 2.5) as compared to their values in the passive syste m of heat shield of the radiation type.