Skin Friction Measurement Techniques for Scramjet Applications. Phase 1. Preliminary Design
Abstract
The objective of this program was to carry out a preliminary design of a gauge to measure skin friction of a scramjet combustor. Preliminary designs of two skin friction measurement approaches have been completed. The work was accomplished by the Marquardt Company and a subcontracted group from Virginia Polytechnic Institute (VPI). With the recent interest in hypersonic flight the challenge to obtain accurate skin friction measurements has became necessary. For example, at a flight condition of Mach 8 at 100,000 feet altitude the estimated skin friction drag of a scramjet engine is approximately 36% of the net thrust. The environment within a scramjet combustor is extremely hostile of any physical object, thus increasing the difficulty of successful measurement of skin friction. The first approach reported is the Cantilever Beam (Design A) design based on the use of a multi-purpose displacement transducer which has the property of being very sensitive while still being stiff. The second or the Thin Film (Design B) approach is a newly established concept by VPI. The design exploits thin film sputtering technology for the purpose of attaching microstrain gauges.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA231899
Entities
People
- R. C. Steele