SUBLIMABLE AND DEGRADABLE THERMAL PROTECTION MATERIALS IN AEROSPACE TECHNOLOGY

Theoretical models of the aerothermochemical interaction between the streamlined surface of a flying vehicle and the dissociated air in the case of combustion and sublimation are presented. Methods and results of investigations were generalized with the aim to obtain a solution on the basis of the similitude method for the case of combustion and sublimation, e.g., of the graphite at an arbitrary cross section of a flying vehicle, around which air flows in the laminar regime at large Reynolds numbers. For different heat-resistant coatings found under the hypersonic-flow conditions varying within a wide range, calculations of the mass flow, the heat flow, and the friction drag coefficient, whose results are related by the universal dependences expressed in terms of the stagnation enthalpy, the local pressure, the velocity gradient, the pressure gradient parameter, and the surface temperature, are presented. The thermophysical properties as well as the kinetic constants of thermoelastic materials at temperatures falling within a wide range were investigated

Author:  N. I. Sidnyaev, L. S. Sklyarinskii
Keywords:  aero-thermochanics, thermal protection materials, simulation, sublimation, hypersound
Page:  1042