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ISSN オンライン: 2642-0554

PLASMA-BASED MANIPULATION OF SECONDARY FLOW TOWARDS PRESSURE RECOVERY ENHANCEMENT IN A 3D DIFFUSER: A COMPUTATIONAL STUDY

I. Maden
Technische Universitat Darmstadt, Department of Mechanical Engineering, Institute of Fluid Mechanics and Aerodynamics (SLA) / Center of Smart Interfaces (CSI). Alarich-Weiss-Strasse 10, D-64287 Darmstadt, Germany.

R. Maduta
Outotec GmbH, Ludwig-Erhard-Strasse 21, D-61440 Oberursel, Germany

Suad Jakirlic
Department of Mechanical Engineering Institute of Fluid Mechanics and Aerodynamics (SLA) / Center of Smart Interfaces (CSI) Technische Universitat Darmstadt Petersenstrasse 17, D-64287 Darmstadt, Germany

Sven Grundmann
Department of Mechanical Engineering Institute of Fluid Mechanics and Aerodynamics (SLA) / Center of Smart Interfaces (CSI) Technische Universitat Darmstadt Petersenstrasse 17, D-64287 Darmstadt, Germany

Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany

John K. Eaton
Dept. of Mechanical Engineering Stanford University 488 Panama Mall Stanford, CA 94305 USA

要約

The present work focusses on the computational study of plasma-actuated flow control towards pressure recovery enhancement with respect to flow reversal weakening in a 3D diffuser configuration, investigated experimentally by Grundmann et al. (2011). The measurements were conducted by utilizing a streamwise-oriented arrangement of a dielectric barrier discharge plasma actuator mounted on the top wall of the inflow duct. Herewith a counter-rotating pair of streamwise vortices was generated modifying the inflow towards increase of turbulence intensity. The most efficient scenario, contributing mostly to the pressure recovery implies an actuator configuration pulsed with 40% duty cycle (pertinent to forcing frequency f mod = 50 Hz and forcing amplitude corresponding to operating voltage Epl = 10000Vpp). The present computational study is primarily concerned with this case assessing it comparatively to the baseline configuration with no actuation imposed. Simulations are performed within the Unsteady RANS (Reynolds-Averaged Navier Stokes) framework by using an eddy-resolving Second-Moment Closure as a sub-scale model, Maduta and Jakirlic (2011). The plasma actuator was simulated by using a force-distribution database based on the PIV (Particle Image Velocimetry) measurements of the flow induced by a plasma actuator, Kriegseis et al. (2013) and Maden et al. (2013). The results obtained with respect to the pressure recovery enhancement pertinent to lowering of the backflow intensity due to appropriate turbulence increase show high potential of the present instability-sensitive turbulence model in conjunction with the plasma actuator model.