Reynolds Stresses in a Hypersonic Boundary Layer with Streamline Curvature-Driven Favorable Pressure Gradients Conference Paper uri icon

abstract

  • The role of streamline curvature-driven favorable pressure gradients on modifying the Reynolds stresses in Mach 4.9, high Reynolds number (Reθ = 43,000) boundary layers is examined. Three boundary layers (β ≈ 0,-0.3 and-1.0) are investigated using particle image velocimetry. The expected stabilizing trends in the Reynolds stresses are observed, with the sign reversal in the Reynolds shear stress for the strongest favorable pressure gradient. For the present flows, the increased transverse normal strain-rate and reduced principal strain-rate are the primary factors. Reynolds stress quadrant decomposition studies reveals that as the boundary layer negotiate the favorable pressure gradient, the quadrant events are redistributed, such that the relative differences between the quadrant magnitudes decrease. Very little preferential quadrant mode selection is observed for the strongest pressure gradient considered. Overall, the observed processes appear to be driven primarily by large-scale mechanisms, and hence, given the simple geometry, the present data provide a suitable test-bed for Reynolds stress transport and large-eddy model development and validation. As an example, a simplified evaluation of the LRR Reynolds stress transport equation demonstrates promise for this class of flow. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

author list (cited authors)

  • Tichenor, N., Humble, R., & Bowersox, R.

publication date

  • January 1, 2012 11:11 AM