INVESTIGATION ON THE TURBULENT CHARACTERISTICS OF THE JET INDUCED BY A PLASMA ACTUATOR

doi:10.6052/0459-1879-17-392

Abstract

Abstract:

In order to understand the controlling mechanism of plasma actuator and develop the mathematical model of plasma actuator, the turbulent characteristics of the jet induced by a dielectric barrier discharge (DBD) plasma actuator in quiescent air was studied in a closed chamber using particle image velocimetry (PIV). Here, an asymmetrical DBD plasma actuator was mounted on the plate model. First, measured time-averaged velocity field induced by the DBD plasma actuator indicated that voltage amplitude is an important parameter and could affect the flow characteristics of the induced jet. When the plasma actuator was driven at low voltage, the induced jet was a laminar wall jet. On the other hand, the Reynolds number of induced jet was improved and the shear layer was instability when the plasma actuator was actuated at high voltage. Then the induced jet became a turbulent wall jet. Secondly, the results of transient flow field structure suggested that the induced turbulent wall jet had some coherent structures, such as rolling up vortex and secondary vortex in the near-wall region. And these structures were linked to a dominant frequency of $f 0 = 109$ Hz. The rolling up vortices had the process of formation, movement, merging and breakdown. Thirdly, the rolling vortex was stretched and collapsed due to the instability of flow field when the plasma actuator was actuated at high voltage. Then turbulence kinetic energy of induced flow filed was increased and the breakdown of rolling vortex was accelerated. The turbulent characteristics of the induced jet could enhance the entrainment effect of plasma actuator between the outside airflow and boundary layer flow, which is very important for flow control applications.

Key words: turbulent characteristics, jet, plasma, dielectric barrier discharge, coherent structure

CLC Number:

V211

Zhang Xin, Huang Yong, Yang Pengyu, Tang Kun, Li Huaxing. INVESTIGATION ON THE TURBULENT CHARACTERISTICS OF THE JET INDUCED BY A PLASMA ACTUATOR[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(4): 776-786.

Figures/Tables 13

Fig.1 The typical layout of DBD plasma actuator

Fig.2 Schematic of the experimental set-up

Fig.3 Time-averaged velocity field induced by the DBD plasma actuator in quiescent air

Fig.4 Non-dimensional velocity profiles of the DBD plasma actuator in quiescent air

Fig.5 Reynolds number of plasma jet over the surface in quiescent air

Fig.6 Original PIV images of the flow field induced by plasma actuator in quiescent air

Fig.7 The locations of the calculation point A to C ||||(xA=7.6mm; xB=13.2mm; xC=28.3mm)

Fig.8 Power spectra of the vertical fluctuating velocity at different locations

Fig.9 Evolution of swirling strength in one cycle |||||(T stands for cycle time)

Fig.10 The swirling strength distribution at different times UAC(p-p)=9.8kV,fAC=3kHz)

Fig.11 Root-mean-squared (r.m.s.) velocity profiles over the surface of flat plate (Up-p=9.8kV,fAC=3kHz)

Fig.12 Distributions of the maximum streamwise r.m.s. velocity, the maximum vertical r.m.s. velocity, and the maximum Reynolds shear stress over the surface of flat plate (Up-p=9.8kV,fAC=3kHz) |||| (a) The maximum streamwise r.m.s. velocity ; (b) The maximum vertical r.m.s. velocity; (c) The maximum Reynolds shear stress

Fig.13 The distributions of turbulence kinetic energy (t=4T/8,UAC(p-p)=9.8kV,fAC=3kHz)

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