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 : JAN 1968

Pagination or Media Count : 31

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 BTU/sq ft sec but show 25% deviations at levels about 2 BTU/sq 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