Effect of the Chemical State of Pyrolysis Gases on Heat-Shield Mass.

Abstract

Results are presented from an analytical investigation to determine the effect of the chemical state of the pyrolysis gases on the heat-shield mass required for a reentry vehicle in a given environment. Mass per unit area of ablative material required is calculated for a number of constant-heating-rate environments and the total mass is calculated for a lifting-body vehicle in a typical reentry trajectory. The required mass of ablative material is calculated for three different assumptions: (1) The pyrolysis gases are in chemical equilibrium at all times, (2) the gases are chemically frozen at 500 deg K, and (3) the gases change from the frozen state to equilibrium over some temperature range. p3

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1968
Accession Number
ADA306852

Entities

People

  • C. W. Stroud
  • Ronald K. Clark
  • William D. Brewer

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Ablative Materials
  • Chemical Equilibrium
  • Chemical Reaction Properties
  • Chemical Reactions
  • Decomposition
  • Equations
  • Flow Rate
  • Heat Shields
  • Lifting Bodies
  • Materials
  • Pyrolysis
  • Reentry Vehicles
  • Specific Heat
  • Stagnation Point
  • Surface Temperature
  • Temperature Gradients
  • Transition Temperature

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Fluid Dynamics.
  • Rocket Propulsion.