Uncovering Flow Physics for High-Speed Cavity Flow Control
Abstract
The proposed effort encompasses a complementary experimental and numerical study to developa fundamental understanding of three-dimensional cavity flows and leverage this knowledge todevelop effective physics-based active suppression schemes for high-speed cavity oscillations.This objective represents a significant challenge and can only be accomplished by understandingthe stability characteristics and dynamics of the cavity flow field. Cavity flows represent acanonical resonant feedback flow phenomenon that is relevant to several Air Force applications,making it an ideal candidate for a flow physics and control study. This research will involve theelucidation of the fundamental flow relationship between causal cavity shear layer events and theresulting fluctuating surface pressure, stability/resolvent analysis to highlight key instabilitycharacteristics (i.e., frequencies, growth rates, wavelengths and modal structures), and thecorresponding implementation of physics-based active control schemes. In thisstudy, we will extend the linear stability analysis to include resolvent (input-output) analysis ofthe turbulent cavity flows to better understand the flow physics and enhance the efficiency of theflow control. A novel application of the resolvent analysis as well as our prior results from biglobalstability analysis will be combined with closely-coupled experiments to extend our previousthree-dimensional steady blowing scheme to include time-dependence. Furthermore, we willexplore the interaction of the optimized flow control on the resulting resonant flow field dynamics.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Apr 09, 2018
- Source ID
- FA95501710380
Entities
People
- Lawrence S Ukeiley
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Florida