08 September 2022

Séminaire FTC: Application of Passive and Active Flow Control to a Supersonic Multistream Rectangular Nozzle – Mark Glauser, PhD

[TheChamp-Sharing]
Mark Glauser, PhD - Passive and active flow control techniques are applied experimentally to examine different aspects of a supersonic multistream rectangular nozzle representing a modern airframe-integrated variable cycle engine. The flow is comprised of a core stream (M = 1.6) and bypass (M = 1.0) that merge behind a splitter plate and exit through a Single Expansion Ramp Nozzle (SERN) onto an aft-deck...

ABSTRACT

Passive and active flow control techniques are applied experimentally to examine different aspects of a supersonic multistream rectangular nozzle representing a modern airframe-integrated variable cycle engine. The flow is comprised of a core stream (M = 1.6) and bypass (M = 1.0) that merge behind a splitter plate and exit through a Single Expansion Ramp Nozzle (SERN) onto an aft-deck. Previous efforts for the nominal nozzle configuration have shown that an instability initiated at the splitter plate trailing edge (SPTE) influences the effectiveness of the third stream as a barrier for the aft-deck and persists through the entire domain due to its reaction with the shock train. To address this, the passive flow control was implemented by introducing sinusoidal spanwise modifications along the splitter plate edge. The SPTE was identified as the highest region of sensitivity via LES. Results on different spanwise wavenumbers indicate reduction of the dominating tone with increasing wavenumber. Additionally, the sinusoidal trailing edge induces streamwise vorticity, which enhances mixing between the two streams and breaks up the shed structures seen previously. A wavenumber corresponding to one simulated was tested experimentally via the use of simultaneous nearfield pressure and velocity in conjunction with far field acoustics. Fairfield acoustic measurements have confirmed the diminishment of the tone for the wavy SPTE. PIV and velocity profiles for mean fields revealed higher plume vectoring for the nominal aft-deck. The shear layers and the region along the aft-deck surface displayed significant enhancement of velocity variability through low order statistics. As a result of this increase, the POD modes were reordered for the wavy SPTE. Wavy modes had smaller spatial structures presented in lower modes, with increased energy content when compared to the same modes in the nominal flow.   Current active control experiments involve replacing the wavy splitter with a bank of jets spaced at the same wavelength.   This allows us to explore if similar results to the wavy splitter can be obtained with the nominal splitter and the bank of jets.

Mark Glauser, PhD

Professor of Mechanical and Aerospace Engineering 

College of Engineering and Computer Science 

Professor of Physics,  College of Arts and Sciences 

Syracuse University 

263 Link Hall

Syracuse, New York 13244

Fellow: AIAA, ASME, APS, Institute of Physics (UK)

08 September 2022, 11h0012h00
Pprime Bâtiment H2 Futuroscope. Salle 175/177.

Prochains évènements

Retour à l'agenda
24 November 2022

Séminaire FTC : Microgravity E-FIELD Flames on the ISS and Gas Hydrates for Combustion Research - Alice Yu-Chien

Electric Field Effects on Laminar Diffusion Flames (E-FIELD Flames) is one of the Advanced Combustion via Microgravity Experiments (ACME) of the National Aeronautics and Space Administration (NASA). The E-FIELD Flames experiment studies a hydrocarbon flame jet to determine how an electric field leads to an electric body force and a resultant ion-driven wind when the normal 1-g buoyant force is not participating in the process...

10 November 2022

Séminaire FTC: Freezing contact line - Thomas Séon

Ice accretion on airplane, wire or roadway, formation of ice fall, ice stalactite, frozen river or aufeis, are a few examples of ice structures formed by the solidification of capillary flows (drop, rivulet, film)....