Attenuation of Low-Speed Flow-Induced Cavity Tones Using Plasma Actuators

The aeroacoustic environment of an open cavity with a length-to-depth (LID) ratio of 1.0 was studied with and without plasma actuators. The study was conducted through low-speed wind-tunnel experiments at freestream velocities between 10 and 20 m/s, corresponding to Reynolds numbers based on the depth of the cavity of 3.6 x 104 to 7.1 x 10 4 . The fluid flow inside the cavity was studied using a range of measurement techniques, which include oil flow, particle imaging velocimetry, and surface-mounted-microphone measurements. For acoustic control, an array of plasma actuators were located on the approaching surface to the cavity, aligned with the direction of the oncoming flow. Results show that the plasma actuators lead to a significant attenuation of the dominant cavity mode. The particle imaging velocimetry surveys around the electrode elements reveal vortical structures produced by the plasma actuators. These structures convect downstream with the mean flow and produce spanwise variations in the flow over the cavity that affect the spanwise coherence of the shear layer and hence the corresponding Rossiter mode.

[1]  Thomas C. Corke,et al.  Phased plasma arrays for unsteady flow control , 2000 .

[2]  Deepak Shukla,et al.  DEVELOPMENT OF AN ADAPTIVE WEAPONS-BAY SUPPRESSION SYSTEM , 1999 .

[3]  U. Kogelschatz,et al.  Filamentary, patterned, and diffuse barrier discharges , 2002 .

[4]  G. V. Parkinson,et al.  Blockage tolerance of a boundary-layer wind tunnel , 1992 .

[5]  John M. Seiner,et al.  MECHANISMS IN HIGH-FREQUENCY CONTROL OF CAVITY FLOWS , 2003 .

[6]  J. D. Bugg,et al.  Variable threshold outlier identification in PIV data , 2004 .

[7]  Chang-Koon Choi,et al.  Wind tunnel blockage effects on aerodynamic behavior of bluff body , 1998 .

[8]  James Westervelt.  Error and Uncertainty Analysis , 2001 .

[9]  J. Roth,et al.  Electrohydrodynamic Flow Control with a Glow-Discharge Surface Plasma , 2000 .

[10]  Timothy J. Bencic,et al.  Cavity Resonance Suppression Using Miniature Fluidic Oscillators , 1999 .

[11]  Clarence W. Rowley,et al.  Review of Active Control of Flow-Induced Cavity Resonance , 2003 .

[12]  P. Drazin.  Introduction to Hydrodynamic Stability , 2002 .

[13]  John M. Seiner,et al.  Suppression of Pressure Loads in Cavity Flows , 2002 .

[14]  K. Krishnamurty,et al.  Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surfaces , 1955 .

[15]  Robert J. Moffat,et al.  Describing the Uncertainties in Experimental Results , 1988 .

[16]  Louis N. Cattafesta,et al.  Experiments on compressible flow-induced cavity oscillations , 1998 .

[17]  E. Naudascher,et al.  Self-Sustained Oscillations of Impinging Free Shear Layers , 1979 .

[18]  V. Sarohia.  Experimental investigation of oscillations in flows over shallow cavities , 1976 .

[19]  J. Rossiter.  Wind tunnel experiments on the flow over rectangular cavities at subsonic and transonic speeds , 1964 .

[20]  P. Stephen,et al.  Boundary Layer Flow Control With a One Atmosphere Uniform Glow Discharge Surface Plasma , 1998 .

[21]  Robert L. Stallings,et al.  Experimental cavity pressure distributions at supersonic speeds , 1987 .

[22]  Z. C. Liu,et al.  Analysis and interpretation of instantaneous turbulent velocity fields , 2000 .

[23]  M G Macaraeg,et al.  Fundamental Investigations of Airframe Noise , 1998 .

[24]  E. Covert,et al.  Flow-Induced Pressure Oscillations in Shallow Cavities , 1971 .

[25]  D. Rockwell,et al.  Review—Self-Sustaining Oscillations of Flow Past Cavities , 1978 .

[26]  Valdis Kibens,et al.  Control of cavity resonance through very high frequency forcing , 2000 .

[27]  Thomas Corke,et al.  Plasma Actuators for Landing Gear Noise Reduction , 2005 .

[28]  Donald Rockwell,et al.  Imaging of the self-excited oscillation of flow past a cavity during generation of a flow tone , 2002 .

[29]  Phase Synchronization of Vortex Shedding from Two Side-by-Side Circular Cylinders Using Plasma Actuators , 2004 .

[30]  Xin Zhang.  Counter-Rotating Vortices Embedded in a Turbulent Boundary Layer with Inclined Jets , 1999 .

[31]  Harvey H. Hubbard,et al.  Aeroacoustics of Flight Vehicles: Theory and Practice , 1994 .

[32]  Clarence W. Rowley,et al.  Dynamics and control of high-reynolds-number flow over open cavities , 2006 .

[33]  E. Jumper,et al.  Mechanisms and Responses of a Dielectric Barrier Plasma Actuator: Geometric Effects , 2004 .

[34]  D. M. Sherman,et al.  The transition from a filamentary dielectric barrier discharge to a diffuse barrier discharge in air at atmospheric pressure , 2005 .

[35]  Farrukh S. Alvi,et al.  Review of Active Control of Flow-Induced Cavity Oscillations (Invited) , 2003 .