应用直角形状等离子体激励器对后台阶流动的主动控制

doi:10.7527/S1000-6893.2015.0250

Abstract

Abstract: Abstract: The Reynolds stress is the important dynamic quantity affecting the mean flow in the turbulent flow, it greatly affects the momentum transfer in turbulent flows, thus strongly influence skin friction, subsequently it plays a key role for friction drag and flow separation. So, The purpose of this article is to present the flow control with special designed right-angle-shaped plasma actuator which can emit jet at about 45o through manipulation of the Reynolds stress, meanwhile the alteration for reattachment location over backward facing step. In the process of experiment, The output excitation frequencies for the right-angle-shaped plasma actuator is modulated by the natural instability frequency at 0.5H(H means step height) streamwise positions of the backward-facing step. The region from 0H to 2.5H is measured by PIV(Particle Image Velocimetry), reattachment zone also is measured by PIV. The results showed that when the right-angle-shaped plasma actuator is turned on, the maximum of Reynolds stresses components in the region centered on the shear layer and nearby the shear layer are significantly increased about 42%(< >),75%(< >),46%(-< >), the maximum of turbulent kinetic energy production in region centered on the shear layer is reduced about 11% .The reattachment location is moved upstream in the reattachment zone

Key words: Key words: right-angle-shaped plasma actuator, Reynolds stress, turbulent kinetic energy production, reattachment location, PIV

CLC Number:

中图分类号：V211

References

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Active control of Flow over Backward Facing step by right-angle-shaped plasma actuator

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