Accession Number:

AD1144447

Title:

A Comprehensive Study of Shock-wave-boundary-layer Interactions on Curved Surfaces

Descriptive Note:

[Technical Report, Final Report]

Corporate Author:

FLORIDA AGRICULTURAL AND MECHANICAL UNIV TALLAHASSEEAIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

2021-07-08

Pagination or Media Count:

17

Abstract:

A comprehensive study involving experiments and numerical simulations was carried out to understand the flow physics associated with shock boundary layer interactions and shock-shock interactions on an axisymmetric configuration. The shock interaction mechanisms on anaxisymmetric body with a curved surface are very complex and different than conventionally studied two and three-dimensional configurations involving flat surfaces. In the present study, the experiments were carried out at the FAMU-FSU College of engineering polysonic wind tunnel and numerical simulations were performed by AFRL- RQHP team using Kestrel flow solver. Kestrel, a multi-physics flow solver, is the fixed wing component of the Computational Research and Engineering Acquisition Tools and Environments CREATE Program managed by the Department of Defense High-Performance Computing Modernization Program DoD HPCMP. Measurements include flow visualizations using surface oil flow and high-speed shadowgraph, surface static pressures using Electronic Pressure Scanner ESP, surface static pressure field using Pressure Sensitive Paint PSP technique, unsteady pressure distributions using fast-response Kulite pressure sensors and force measurements using a six-component strain gage balance. Results show that shock emanating from the wedge impinges on and wraps aroundthe body leading to crossflow separation and reattachment. The flow features observed are very different from the well-documented 23D canonical configurations involving SBLI on flat surfaces. The separation bubble grows non-linearly in size with the smallest in length at the topgenerator the side facing the shock generator. There is no well-defined length scale in this interaction. Surface pressure distributions obtained using ESP, PSP and Kestrel match very well, and show some interesting results. The narrowband spectra show low-frequency oscillations at the shock impingement and the interaction region.

Descriptors:

Subject Categories:

  • Fluid Mechanics
  • AERODYNAMICS

Distribution Statement:

[A, Approved For Public Release]