An Investigation of Ablation Behavior of Avcoat 5026/39M Over a Wide Range of Thermal Environments.

Abstract

Ablation studies have been carried out on the ablation material Avcoat 5026-39/M (a low-density glass-filled epoxy-novolac system) over a wide range of pressures, heat-transfer coefficients, and oxygen fluxes. At values of heat-transfer coefficient less than 0.17 lbm/7ft(2)-sec (0.83 kg/m(2)-sec), measured char recession rates were comparable to those predicted for diffusion-controlled char oxidation. At high values of heat-transfer coefficient, the ablation rate increased rapidly with increasing heat-transfer coefficient and severe mechanical char failure was observed. The structure, composition, and removal rate of the char were significantly influenced by stream oxygen content at low heat-transfer coefficients but not at high heat-transfer coefficients.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1969
Accession Number
ADA308517

Entities

People

  • Gerald D. Walberg
  • Roger K. Crouch

Organizations

  • Langley Research Center

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Chemical Reactions
  • Equations
  • Failure Mode And Effect Analysis
  • Glass Fibers
  • Heat Transfer
  • Heat Transfer Coefficients
  • High Pressure
  • Mach Number
  • Materials
  • Motion Pictures
  • Payload
  • Pyrolysis
  • Shear Stresses
  • Silicon Carbide
  • Stagnation Pressure
  • Surface Temperature

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Polymer Science and Engineering.