HEAT TRANSFER MEASUREMENTS IN HYPERSONIC LOW DENSITY FLOWS WITH PHASE CHANGE COATINGS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1968
- Accession Number
- AD0669084
Entities
People
- Gerald M. Gregorek
- John D. Lee
Organizations
- Ohio State University