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heat shield
Nonstationary gas filtration in a two-layered heat shield
      
A gas mist produced by supplying a cooling gas through a separate slot or a system of slots along the surface is a widespread method of obtaining a mass-transfer heat shield.
      
According to estimates in [1], the heat shield mass for entry of a probe into the atmospheres of the outer planets can make up 20-50% of its total mass; here the radiative component predominates in the aerodynamic heating.
      
The results are compared with the data of a space shuttle flight experiment on the effect of a discontinuity of heat shield catalyticity on the "overequilibrium" surface temperature jump.
      
One of the important problems has been to create reusable heat shield materials.
      
In [1, 2] information concerning the methods and results of solving these problems, including the development of composites from ultrathin quartz fibers and carbon-carbon materials for the "Buran" orbital vehicle heat shield, was presented.
      
In the present paper the experimental and computational aspects of determining these parameters, which are also of interest for new heat shield materials for future space transport systems, are discussed.
      
Simulation of heterogeneous atom recombination on spacecraft heat shield coatings using the methods of molecular dynamics
      
Oxygen atom recombination on a β-cristobalite surface of the type frequently used in spacecraft heat shield systems is investigated.
      
This simulation made it possible to determine the effect of a heat shield on the processes of v-i recombination and microdefect formation.
      
Numerical analysis for heat shield ablation law in transpiration cooling system
      
In this paper a calculation procedure for simulating the combustion flow in the afterburner with the heat shield, flame stabilizer and the contracting nozzle is described and evaluated by comparison with experimental data.
      
The solution domain spanned the entire region between centerline and afterburner wall, with the heat shield represented as a blockage to the mesh.
      
The enthalpy equation and wall boundary of the heat shield require special handling for two passages in the afterburner.
      
It is concluded that the recovery is technologically feasible, using a detachable ablative heat shield on the nose of the stage and a stabilisation device (an inflatable drag cone), a parachute system and an engine enclosure device.
      
Similarity of boundary conditions is ensured by a heat shield with a controlled temperature serving as a free parameter.
      
Experimental heat transfer investigation in heat shield material test facilities
      
An experimental investigation has been made of the thermal interaction of the gas in a facility for testing heat shield materials.
      
Reflectance of heat shield materials under radiant-convective heating
      
A procedure is presented for determining the spectral emissivity and surface temperature of heat shield materials subjected to radiant-convective heating by using the radiant component of the heat flux.
      
 

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