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Investigation of piezoelectrically generated synthetic jet flow

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Abstract

The purpose of this paper is to investigate the compressible turbulent synthetic jet flow characteristics of a dual diaphragm piezoelectric actuator. Experimentally, a flow visualization system was established to obtain the particle streak images scattered from 10-μm red fluorescent spheres for observing the synthetic jet flowfield produced by a dual diaphragm piezo actuator. The centerline velocity of the synthetic jet was also measured by using a hot-wire anemometry system. In the analysis, the computational approach adopted the transient three-dimensional conservation equations of mass and momentum with the moving boundary specified to represent the piezo diaphragm motion. The standard k-∈ two-equation turbulent model was employed for turbulence closure. For the actuator operating at the frequency of 648 Hz, the particle streakline images in the cross-sectional plane visualized a turbulent jet flow pattern in the far-field area. The hot-wire anemometry data indicated that the measured centerline velocity of synthetic jets reached 3.8 m/s at y/d= 50. The predictions were compared with the visualized particle streak images and centerline velocity of the synthetic jet in order to validate the computer code. The numerical simulation revealed the time-periodic formation and advection of discrete vortex pairs. Caused by the outward movement of the piezo diaphragms, air near the orifice was entrained into the actuator cavity when the vortex pairs were sufficiently distant from the orifice.

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Authors and Affiliations

  1. Department of Energy and Refrigerating Air-Conditioning Engineering, National Taipei University of Technology, 106, Taipei, Taiwan

    Yang A. S.

  2. Department of Mechanical and Automation Engineering, Da-Yeh University, 51505, Changhua, Taiwan

    Ro J. J., Yang M. T. & Chang W. H.

Authors
  1. Yang A. S.
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  2. Ro J. J.
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  3. Yang M. T.
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  4. Chang W. H.
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Correspondence to Yang A. S..

Additional information

An-Shik Yang: Dr. An-Shik Yang is an Associate Professor of Department of Energy and Refrigerating Air-Conditioning Engineering at National Taipei University of Technology (NTUT), in Taiwan. His research interests are in the areas of micro-fluidic design, multiphase fluid dynamics, and heat transfer. Prior to joining NTUT in fall 2007, Dr. Yang was a faculty member of Department of Mechanical and Automation Engineering at Da-Yeh University in Taiwan from 2000 to 2007. He received his B.S. (1982) and M.S. (1984) degrees from National Tsing-Hua University in Taiwan, and Ph.D. (1993) degree from Pennsylvania State University in USA. All three degrees are in Mechanical Engineering with an emphasis in the thermo-fluid sciences.

Jeng-Jong Ro: Dr. Jeng-Jong Ro joins the Department of Mechanical and Automation Engineering at Da-Yeh University as an associate professor on August 2000. Before he joined Da-Yeh University, He was a faculty member of Aerospace Engineering at Old Dominium University, Virginia during 1997 to 2000. Dr. Ro earned Ph.D. and M.S. degrees in Mechanical Engineering from Catholic University of America, Washington D.C. in 1990 and 1993. His research interests include active and passive control of structural vibration and radiated noise using smart materials, the design and analysis of piezoelectric synthetic jet actuators and the investigation of piezoelectric harvesting system.

Ming-Tang Yang: Mr. Ming-Tang Yang received his M.S. degree in Mechanical and Automation Engineering form Da-Yeh University, Taiwan in 2007. He joined NAK SEALING TECHNOLOGIES CORPORATION as a R&D Engineer in 2007. His research interests are system analysis, simulation and experiment flow dynamics.

Wei-Han Chang: Mr. Wei-Han Chang is currently a graduate student in Mechanical and Automation Engineering of Da-Yeh University in Taiwan. His M.S. thesis topic is Flow Behavior Study of Synthetic Jets. His research interests are computer-aided engineering analysis, experiment flow dynamics, and power MEMS.

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Yang, A.S., Ro, J.J., Yang, M.T. et al. Investigation of piezoelectrically generated synthetic jet flow. J Vis 12, 9–16 (2009). https://doi.org/10.1007/BF03181938

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  • DOI: https://doi.org/10.1007/BF03181938

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