Accession Number:

ADA231899

Title:

Skin Friction Measurement Techniques for Scramjet Applications. Phase 1. Preliminary Design

Descriptive Note:

Final rept. Sep 1989-Feb 1990

Corporate Author:

MARQUARDT CO VAN NUYS CA

Personal Author(s):

Report Date:

1990-08-01

Pagination or Media Count:

60.0

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.

Subject Categories:

  • Fluid Mechanics
  • Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE