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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

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

pages 1-6
DOI: 10.1615/TSFP8.1720
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摘要

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.

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