基于合成射流的二维后台阶分离流主动控制

doi:10.7527/S1000-6893.2016.0014

Abstract

Abstract:

As a new type of flow control actuator, synthetic jet has a potentially broad application in the fields of flow separation control, pressure pulsation reduction and noise suppression. Experimental investigation on 2D backward facing step turbulent separated and reattachment flow control with synthetic jet arrays is conducted, in which the surface pressure distribution of backward facing step, the field structure and the prominent features of shear layer are tested with many experimental devices such as pressure transducers, particle image velocimetry (PIV) and hot wire anemometer. The results show that the perturbation of synthetic jet which is formed at the upper edge of the step can effectively reduce the recirculation zone and reattachment length; when the synthetic jet momentum coefficient is 0.301×10^-3, the non-dimensional length of reattachment decreases by 25% at most. Synthetic jet control increases the turbulent kinetic energy and Reynolds stress along the downstream steps and enhances the mixing efficiency of the flow field along the downstream steps. The hot wire test results show that frequency is the key parameter of backward facing step flow separation control; when the disturbance frequency is 260 Hz, the ratio of disturbance frequency to shear layer vortex shedding frequency is 1.32 and the forcing frequency is equivalent to the vortex shedding frequency, the effect of synthetic jet control is the best and the flow control can be achieved only with low consumption of energy.

Key words: synthetic jet, backward facing step, flow control, flow separation, reattachment length

CLC Number:

V211.7

LI Binbin, YAO Yong, GU Yunsong, CHENG Keming. Active control of 2D backward facing step separated flow based on synthetic jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016, 37(6): 1753-1762.

References

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Active control of 2D backward facing step separated flow based on synthetic jet

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