A. S. Yakimov

Mathematical simulation of heat and mass transfer in a heat resistant coating with gas flow fluctuations

The thermochemical destruction of a carbon fiber-reinforced polymer when affected by a high-enthalpy fluctuating gas flow is simulated numerically. The possibility of controlling the heat transfer process in the composite material is invesigated.

Calculation of the characteristics of conjugate heat-mass exchange under spatial flow of a blunt body with the use of a combined heat protection system

A three-dimensional problem of conjugate heat-mass exchange (HME) under a high-enthalpy flow of a spherically blunted cone is analyzed theoretically with regard to the gas injection from the surface of a hemisphere, nonequilibrium chemical reactions in the boundary layer (BL), and thermochemical destruction in the screened zone. Controlled intense injection of a cooling gas during the flight of a body along a ballistic trajectory guarantees that the permeable blunting fabricated with the use of porous metals is not destroyed.

Modeling the heat and mass exchange process in the systems of porous cooling with gas flow pulsations

The interaction of heat shielding material with a high-temperature pulsating gas flow is considered. The possibility of heat and mass transfer process control in porous cooling systems is studied.

An investigation of the characteristics of conjugate heat and mass transfer under conditions of injection of gas and thermochemical destruction of a body subjected to flow

The paper deals with the solution of three-dimensional problem of heating and thermochemical destruction under conditions of hypersonic high-enthalpy flow of air past a spherically blunted cone made of materials of different thermophysical properties, with different flow rates of cooling gas injected through a porous blunting.

Some results of mathematical simulation of the process of peat ignition

A formulation and numerical solution of the problem about peat layer ignition as a result of the action of a creeping fire bed are proposed based on a mathematical model of a porous reactive medium. Ignition of the initial reagent is shown to be determined by processes of drying, peat pyrolysis, oxidation of carbon oxide, and moisture content. The results of the numerical solution are compared with experimental data, and an estimate of the mass content of combustion products contaminating the atmosphere is presented.

Modeling of heat-mass transfer in porous cooling systems during phase transformations

The interaction of a porous cooling system and a high-enthalpy gas flow is considered. The effect of the phase transformation on the heat-mass exchange characteristics in a heat-resisting material is investigated.

Mathematical simulation of the influence of surface roughness and mass loss on thermal protection

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.

Calculation of characteristics of heat and mass transfer in a multilayer heat resistant coating

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.