Ultra-High Speed Schlieren for Quantitative Measurements of Hypersonic Flows
Abstract
Driven by recent progress in the fundamental understanding of aerothermodynamics, newhypersonic systems for national defense are under development that provide greater operationalutility and military effectiveness through reduction of the design margins associated with technicaluncertainty. Accompanying the benefits associated with such design choices are increases in technical uncertainty associated with the occurrence of shock wave/boundary layer interactions in boundary layers undergoing laminar turbulent transition. Although turbulent interactions have been studied extensively, interactions occurring in transitional boundary layers have been comparatively ignored with only a few studies within the last several decades.To ensure that the technical, and eventual operational, risk of emerging hypersonic systems arewithin acceptable bounds, there is an increasing demand to accurately characterize and numericallymodel the critical dynamic phenomena that produce extreme localized conditions that representsome of the most significant risk to hypersonic vehicles. Such, phenomena, such as shock-shock[4], shock/boundary layer, and fluid-structure interactions are characterized by a wide rangeof fluid dynamic and structural temporal and spatial scales, and the development of effectivemodels for such phenomena requires well-resolved experimental measurements. When used eitherindividually, or in concert with other complementary diagnostic techniques such as fast-responsePressure Sensitive Paint or Digital Image Correlation for surface pressure distributions and deformations, respectively, high-speed Schlieren imaging that resolves the significant temporal and spatial scales of critical aerothermodynamic phenomena is a powerful tool for characterizing the dynamic behavior of hypersonic flows.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 28, 2018
- Source ID
- FA95501810485
Entities
People
- John D. Schmisseur
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Tennessee