Active Control of Flow Noise Sources in Turbulent Boundary Layer on a Flat-Plate Using Piezoelectric Bimorph Film

  • Song, Woo-Seog (Department of Mechanical Engineering, College of Engineering, Inha University) ;
  • Lee, Seung-Bae (Department of Mechanical Engineering, College of Engineering, Inha University) ;
  • Shin, Dong-Shin (Department of Mechanical System Design Engineering, College of Engineering, Hongik University) ;
  • Na, Yang (CAESIT, Department of Mechanical Engineering, Konkuk University)
  • Published : 2006.11.01

Abstract

The piezoelectric bimorph film, which, as an actuator, can generate more effective displacement than the usual PVDF film, is used to control the turbulent boundary-layer flow. The change of wall pressures inside the turbulent boundary layer is observed by using the multi-channel microphone array flush-mounted on the surface when actuation at the non-dimensional frequency $f_b^+$:=0.008 and 0.028 is applied to the turbulent boundary layer. The wall pressure characteristics by the actuation to produce local displacement are more dominantly influenced by the size of the actuator module than the actuation frequency. The movement of large-scale turbulent structures to the upper layer is found to be the main mechanism of the reduction in the wall- pressure energy spectrum when the 700$700{\nu}/u_{\tau}$-long bimorph film is periodically actuated at the non- dimensional frequency $f_b^+$:=0.008 and 0.028. The biomorph actuator is triggered with the time delay for the active forcing at a single frequency when a 1/8' pressure-type, pin-holed microphone sensor detects the large-amplitude pressure event by the turbulent spot. The wall-pressure energy in the late-transitional boundary layer is partially reduced near the convection wavenumber by the open-loop control based on the large amplitude event.

Keywords

References

  1. Abraham, B. M. and Keith, W. L., 1998, 'Direct Measurements of Turbulent Boundary Layer Wall Pressure Wavenumber-Frequency Spectra,' ASME J. Fluids Eng., Vol. 20, pp.29-39
  2. Blackwelder, R. F. and Haritonidis, J. H., 1983, 'Scaling of the Bursting Frequency in Turbulent Layers,' J. Fluid Mech., Vol. 132, pp. 87-103 https://doi.org/10.1017/S0022112083001494
  3. Choi, H. and Moin, P., 1990, 'On the SpaceTime Characteristics of Wall-Pressure Fluctuations,' physics of Fluids A, Vol. 2, pp. 1450-1460 https://doi.org/10.1063/1.857593
  4. Collis, S. S., Joslin, R. D., Seifert, A. and Theofilis, V., 2004, 'Issues in Active Flow Control: theory, control, simulation and experiment,' Progress in Aerospace Sciences, Vol. 40, pp.237-289 https://doi.org/10.1016/j.paerosci.2004.06.001
  5. Farabee, T. M. and Casarella, M. J., 1991, 'Spectral Features of Wall Pressure Fluctuations Beneath Turbulent Boundary Layers,' physics of Fluids A, Vol. 3, pp.2410-2420 https://doi.org/10.1063/1.858179
  6. Gad-el-Hak, M., 2000, Flow Control, Cambridge University Press
  7. Jacobson, S. A. and Reynolds, W. C., 1998, 'Active Control of Streamwise Vortices and Streaks in Boundary Layers,' J. Fluid Mech., Vol. 360, pp. 179-211 https://doi.org/10.1017/S0022112097008562
  8. Jeon, W. -Po and Blackwelder, R. F., 2000, 'Perturbations in the Wall Region Using Flush Mounted Piezoceramic Actuators,' Exps. Fluids, Vol. 28, No.6, pp.485-496 https://doi.org/10.1007/s003480050410
  9. Keith, W. L. and Bennett, J. C., 1991, 'Low Frequency Measurements of the Wall Shear Stress and Wall Pressure in a Turbulent Boundary Layer,' AIAA, Vol. 29, No.4, pp.526-530 https://doi.org/10.2514/3.10615
  10. Landahl, M. T., 1975, 'Wave Mechanics of Boundary Layer Turbulence Layer,' J.A.S.A., Vol. 57, pp.824-831 https://doi.org/10.1121/1.380514
  11. Lee, S. and Kim, H. -J., 1999, 'Experimental Study on Wall Pressure Fluctuations in the Turbulent Boundary Layer on a Flat-Plate,' J. KSME, Part B, 23, No.6, pp. 722-733. (in Korean)
  12. Powell, A., 1960, 'Aerodynamic Noise and the Plane Boundary,' J.A.S.A., Vol. 32, pp. 982-990 https://doi.org/10.1121/1.1908347
  13. Smith, B. L. and Glezer, A., 1998, 'The Formation and Evolution of Synthetic Jets,' physics of Fluids, Vol. 10, pp. 2281-2297 https://doi.org/10.1063/1.869828
  14. Wang, M., Lele, S. K., Moin, P., 1996, 'Sound Radiation during Local Breakdown in a low Mach-number Boundary Layer,' J. Fluid Mech., Vol. 319, pp. 311-328 https://doi.org/10.1017/S0022112096007318
  15. Wehrmann, O. H., 1965, 'Reduction of Velocity Fluctuations in a Karman Vortex Street by Vibrating Cylinder,' physics of Fluids, Vol. 8, pp.760-761 https://doi.org/10.1063/1.1761299
  16. Wehrmann, O. H., 1967, 'Self-Adjusting Feedback Loop for Mechanical Systems to Influence Flow in Transition. Part I,' Boeing Scientific Research Lab., Document D1-82-0632
  17. Wiltse, J. M. and Glezer, A., 1993, 'Manipulation of Free Shear Flows Using Piezoelectric Actuators,' J. Fluid Mech., Vol. 249, pp.261-285 https://doi.org/10.1017/S002211209300117X