Accession Number:

AD0669084

Title:

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

Descriptive Note:

Technical rept. (Final),

Corporate Author:

OHIO STATE UNIV COLUMBUS AERONAUTICAL AND ASTRONAUTICAL RESEARCH LABS

Personal Author(s):

• Gregorek,Gerald M.
• Lee,John D.

Report Date:

1968-01-01

Pagination or Media Count:

31.0

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

Descriptors:

• (*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

Subject Categories:

• Aerodynamics
• Coatings, Colorants and Finishes
• Test Facilities, Equipment and Methods
• Fluid Mechanics
• Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE