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

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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

Author(s):
Brewer, William D. ; Stroud, C. W. ; Clark, Ronald K.
Author Organization(s):
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
Descriptive Note:
Technical note,
Pagination:
0028

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NASA-TN-D-4975
Monitor Series:
XD
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1.2.7_Experimentation; JCA_8_Building Partnerships
Communities of Interest:
Air Platforms
Descriptor(s):
*MASS, *GASES, *CHEMICAL REACTIONS, *HEAT SHIELDS, *PYROLYSIS, *ABLATIVE MATERIALS, REENTRY VEHICLES, TEMPERATURE, ATMOSPHERE ENTRY, FREEZING, TRAJECTORIES, CHEMICAL EQUILIBRIUM
Field(s)/Group(s):
Physical Chemistry, Inorganic Chemistry, Thermodynamics, Astronautics
Keyword(s):
LIFTING BODY VEHICLE
Report Date:
1968 Dec 01