Multi Stream Near Wall Turbulence Dynamics
Abstract
Prior research established a state of the art experimental setup of a dual stream rectangular nozzle, which is of great current interest to the Air Force for emerging integrated propulsion system designs, where the primary stream, containing a single sided expansion ramp nozzle (SERN), is separated from a wall by another stream emerging in a wall jet configuration. This results in an inner shear layer which interacts with a boundary layer subjected to a myriad of pressure gradients. By carefully establishing the relative conditions between the streams, we build the foundation to understanding the next level of flow complexity. A variety of measurement techniques will be employed, including Particle Image Velocimetry (PIV) and time resolved Schlieren which will be closely coupled with Large Eddy Simulations (LES). The resulting databases will be analyzed using both mature, and emerging data driven analysis techniques that the PIs have extensive experience with. To date, application of many of these methods has primarily focused on much simpler flows, thus a major contribution of this effort will be their utilization to extract key unsteady flow physics characterizing this complex 3D flowfield. The proposed effort will thus deliver invaluable fundamental insight, including flow sensitivity considerations, for a class of configurations that, to date, have only been examined in practical settings. Furthermore, it will accelerate the evolution of future exhaust systems that utilize multiple stream, non axisymmetric designs for enhanced vehicle survivability.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 14, 2022
- Source ID
- FA95501910081
Entities
People
- Mark Glauser
Organizations
- Air Force Office of Scientific Research
- Syracuse University
- United States Air Force