Volume 34 Issue 12
Dec.  2019
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BAI Jianxia, JIANG Nan, TANG Zhanqi. Active modulation to streamwise vortex drag reduction of turbulent boundary layer by asynchronous vibration with double piezoelectric vibrator[J]. Journal of Aerospace Power, 2019, 34(12): 2539-2548. doi: 10.13224/j.cnki.jasp.2019.12.002
Citation: BAI Jianxia, JIANG Nan, TANG Zhanqi. Active modulation to streamwise vortex drag reduction of turbulent boundary layer by asynchronous vibration with double piezoelectric vibrator[J]. Journal of Aerospace Power, 2019, 34(12): 2539-2548. doi: 10.13224/j.cnki.jasp.2019.12.002
shu

Active modulation to streamwise vortex drag reduction of turbulent boundary layer by asynchronous vibration with double piezoelectric vibrator

doi: 10.13224/j.cnki.jasp.2019.12.002
  • 1.

    Department of Mathematics,Tianjin University Renai College,Tianjin 301636,China

  • 2.

    School of Mechanical Engineering,Tianjin University,Tianjin 300072,China

  • 3.

    Tianjin Key Laboratory of Modern Engineering Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300072,China

  • Received Date: 2019-05-16
  • Publish Date: 2019-12-28
    Abstract
  • A closed-loop control circuit comprising of hot wire sensitive filament sensor, microprogrammed control unit (MCU) controller and double piezoelectric vibrators was designed to realize the coherent structure’s drag reduction in turbulent boundary layer under closed-loop active control. Asynchronous vibration of the spanwise piezoelectric vibrators on the wall was adopted. By inputting three different vibration frequencies to the piezoelectric vibrator, the maximum drag reduction efficiency of 16.03% at 160 Hz was acquired. The vibration of the piezoelectric oscillator made the turbulent kinetic energy concentrate around the maximal energy and modulated the coherent structure, which changed the structure of the turbulent boundary layer near the wall. When the vibration frequency of piezoelectric vibrator was close to the characteristic frequencies of coherent structures, the disturbance of piezoelectric vibrator exerted the most significant burst influence on coherent structures, and the drag reduction efficiency reached the maximum. Closed-loop control saved about 75% energy input and achieved a comparable control effect as open-loop control. Under the controlled condition with added condition detection, the time period of the conditional phase average waveform became shorter. The disturbance of piezoelectric oscillator was used to modulate streamwise vortex, thus the wall friction resistance was reduced, and the drag reduction effect was obtained.

     

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