Boundary-Layer Transition and Hypersonic Flight Testing.

Boundary-layer transition continues to be a critical factor in hypersonic fight vehicle design. Measurements of transition during hypersonic flight testing provide valuable data for the development and verification of transition-prediction techniques. A summary of transition-measurement techniques used on vehicles flown by Sandia National Laboratories is presented, including sample flight data to illustrate the type of transition indication obtained from each measurement technique. The Slender Hypervelocity Aerothermodynamic Research Probe, a ballistic vehicle flown by Sandia for NASA, is used as a case study to illustrate how transition is determined for a flight vehicle and to illustrate some of the difficulties associated with these types of measurements. [ABSTRACT FROM AUTHOR]