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A mathematical model of a thermionic thermal protection system has been developed to study the characteristics of heat and mass transfer in a spatial, high-enthalpy air flow around a body. The effect of electron evaporation (emission) from the emitter surface on the decrease in the temperature of the composite shell of thermionic thermal protection is estimated. The effect of different angles of attack on the heat-transfer regimes in the system of multielement thermionic thermal protection is studied. Qualitative agreement of the calculation results with the known data has been obtained. [ABSTRACT FROM AUTHOR]

This work examines the action of the fluctuations of a body in a supersonic air flow on coupled heat and mass transfer in a heat-protection material in the presence of injected thermochemical destruction products and heat and mass transfer between the body and the incoming flow. The results of a numerical study of a spatial supersonic flow around a spherically blunted cone oscillating in the pitch plane are presented. The influence of the oscillations of a body with angular velocity of 0–100 deg/s on the surface temperature and heat transfer characteristics is considered. [ABSTRACT FROM AUTHOR]

The influence of oscillations of a conic body with a nose blunted over a sphere on the conjugate heat and mass transfer in its heat-resistant coating in the case where the material of the conical part of the body is subjected to thermomechanical failure as a result of the flow of a high-enthalpy gas over it was investigated. Results of a numerical investigation of the three-dimensional supersonic flow over such a body executing an oscillatory motion in the pitch plane are presented. [ABSTRACT FROM AUTHOR]

Some methods of control over the thermal regimes realized in a supersonic flow past a conic body with a nose blunted over a sphere were numerically investigated with account of complicating factors. The solution of the problem on the heat and mass transfer in the boundary layer on the surface of this body in the conjugate formulation made it possible to estimate the influence of the nonisothermality of the surface of the body on the characteristics of the indicated transfer. The influence of the rotation of such a body made of composite materials on the heat exchange in the flow over it was determined. [ABSTRACT FROM AUTHOR]

The processes of heating a body in a high-enthalpy spatial flow with allowance for body rotation around its longitudinal axis and ablation of the thermal protection material are studied by means of mathematical simulation. The obtained solution of the problem in conjugate formulation allowed us to take into account the effect of nonisothermic characteristics of the shell on the heat and mass transfer in the boundary layer. [ABSTRACT FROM AUTHOR]

A mathematical model of the thermochemical destruction of carbon fiber-reinforced plastic in the presence of surface roughness and composite ablation is refined based on known theoretical results. It is shown that mass loss through rough surface ambiguously influences the intensity of heat exchange processes in thermal protective material. Results of numerical calculations are compared with known data. [ABSTRACT FROM AUTHOR]

On the basis of theoretical and known experimental results, an improved mathematical model of thermochemical destruction of a multilayer thermal-protective coating is presented. Taking into account the heat transfer across the body made it possible to predict with a higher accuracy the state of a protected structure in fire conditions. The numerical results are compared with known experimental data. [ABSTRACT FROM AUTHOR]