Nonlinear Transition Stages in Hypersonic Boundary Layers: Fundamental Physics, Transition Control and Receptivity
Abstract
Main objective is to study the fundamental physical principles of air flow associated with the nonlinear stages defined in hypersonic boundary layer transition. This include 1) flow physics of the nonlinear transition stages for the quiet flow conditions at Purdue and TAMU for various model geometries and test conditions; 2) unequivocally identify/confirm that streaks observed in the experiments are due to the same mechanisms as predicted by DNS analysis; 3) Focus on the nonlinear development of the cross-flow vortex modes and in particular the nonlinear interaction with the traveling second mode waves that dominate the transition process at zero angle of attack; 4) examine if the nonlinear mechanisms for the quiet cold flow conditions are still relevant for the T5 (free-flight hot) conditions, or are entirely new mechanisms at work; 5) Investigate Flow Control (passive and active) to modify the nonlinear mechanisms such that overall transition is delayed; and 6) explore receptivity factors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Mar 23, 2016
- Source ID
- FA95501510265
Entities
People
- Hermann Fasel
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Arizona