HEAT TRANSFER MEASUREMENTS IN HYPERSONIC LOW DENSITY FLOWS WITH PHASE CHANGE COATINGS.

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Abstract:

Aerodynamic heat transfer rates to blunt 10 and 25 degree cones were measured using surface coatings which change phase at precisely known temperatures. Results from motion picture time-histories of the melting of the coatings on nylon and teflon models taken at Mach 10 and Re sub infinity D 5600 are compared with earlier experiments on thin-skin models using a transient technique. The two methods agree within 5 at heating rate levels below 1 BTUsq ft sec but show 25 deviations at levels about 2 BTUsq ft sec. This error is attributed to the injection procedure which made determination of the exact moment of model insertion difficult. Author

Author(s):
Gregorek, Gerald M. ; Lee, John D.
Author Organization(s):
OHIO STATE UNIV COLUMBUS AERONAUTICAL AND ASTRONAUTICAL RESEARCH LABS
Descriptive Note:
Technical rept. (Final),
Pagination:
0031

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
TR-5, ARL-68-0004
Contract/Grant Number(s):
AF 33(657)-11060
Project Number(s):
AF-7065
Monitor Series:
68-0004
 Subject Terms
Modernization Areas:
Hypersonics
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*HEAT TRANSFER, *AERODYNAMIC HEATING), (*PLASTIC COATINGS, TEMPERATURE SENSITIVE ELEMENTS), NYLON COATINGS, HALOCARBON PLASTICS, TEST METHODS, HYPERSONIC CHARACTERISTICS, PHASE STUDIES, DENSITY, CONICAL BODIES, DIFFUSION, WIND TUNNEL MODELS, MODEL TESTS, PAINTS, THERMAL PROPERTIES, THICKNESS, DETECTORS
Field(s)/Group(s):
Aerodynamics, Coatings, Colorants and Finishes, Test Facilities, Equipment and Methods, Fluid Mechanics, Thermodynamics
Report Date:
1968 Jan 01