Volume 32 Issue 10
Oct.  2017
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Measurement on instantaneous flow fields of a sparkexcited synthetic jet[J]. Journal of Aerospace Power, 2017, 32(10): 2371-2377. doi: 10.13224/j.cnki.jasp.2017.10.009
Citation: Measurement on instantaneous flow fields of a sparkexcited synthetic jet[J]. Journal of Aerospace Power, 2017, 32(10): 2371-2377. doi: 10.13224/j.cnki.jasp.2017.10.009
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Measurement on instantaneous flow fields of a sparkexcited synthetic jet

doi: 10.13224/j.cnki.jasp.2017.10.009
  • Received Date: 2016-03-11
  • Publish Date: 2017-10-28
    Abstract
  • Phaseresolved instantaneous flow fields were experimentally measured by using particle image velocimetry (PIV) for the synthetic jets, which were excited by a specific sparkdischarge actuator. The unsteady flow structures of the sparkexcited synthetic jet during the developing process were captured. Meanwhile, the instantaneous velocities of the sparkexcited synthetic jet at some fixed axial positions downstream the nozzle were measured by using the hotwire anemometer. The effects of the spark-excitation parameters (such as discharge frequency and capacitance energy storage) on the synthetic jet were preliminarily analyzed. It was revealed that the sparkexcited synthetic jet took on sphericalshape diffusion near the jet nozzle at the initial stage of synthetic jet formation. As the synthetic jet developed, a series of vortices were induced by the shear and entrainment actions of the synthetic jet. The maximum peak normalvelocity appeared about 005T after pulsed discharge. From this moment the synthetic jet diffused rapidly, resulting in the decrease of peak velocity and vorticity. For the present sparkexcited actuator and the excitation parameters, the sparkexcited synthetic jet was strengthened with the increase of excitation frequency and capacitance energy storage.

     

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