Influence of Strouhal number and phase difference on the flow behavior of a synthetic jet array

Author:

Pasa Jangyadatta1,Panda Samarendra1,Arumuru Venugopal1ORCID

Affiliation:

1. Applied Fluids Group, School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 752050, India

Abstract

A computational study is presented to characterize the flow behavior of independently controlled multiple synthetic jet actuators (SJA). For fixed geometric configuration and Reynolds number ([Formula: see text]) [Formula: see text], the influence of Strouhal number ([Formula: see text]) and phase difference [Formula: see text]) between the actuators on the evolution, and interaction of the vortices are highlighted. Directivity plots are employed to illustrate the effect of [Formula: see text] on the vectoring behavior of a synthetic jet array (SJ array). It has been observed that a high jet vectoring angle ([Formula: see text]) is achieved while operating the SJ array at low [Formula: see text]. The vectoring angle seems to be independent of [Formula: see text] for the low and high [Formula: see text]. However, for an intermediate [Formula: see text], the vectoring angle varies with the [Formula: see text]. The phase averaged vorticity contour for [Formula: see text] reveals that the evolution of the anti-clockwise vortex from the leading actuator (SJA1) decides the vectoring of the jet. By contrast, for higher [Formula: see text]([Formula: see text] and [Formula: see text]), the remnant vortices play a significant role in vectoring the jets toward the leading actuator. Based on the cross-stream distribution of time-averaged streamwise velocity, three distinct flow regimes are characterized: near-field, intermediate-field, and far-field. The strength of the jet is quantified by the downstream distribution of the jet momentum flux. Proper evolution of the vortices results in the enhancement of the jet momentum flux. It is recommended to operate the SJ array at an intermediate [Formula: see text] ([Formula: see text]) to vary the jet vectoring angle with phase differences as well as to achieve maximum jet momentum flux.

Funder

Department of Science and Technology, Ministry of Science and Technology, India

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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