Open Access

ARTICLE

Numerical Analysis of a Microjet-Based Method for Active Flow Control in Convergent-Divergent Nozzles with a Sudden Expansion

Abdul Aabid^1,*, Sher Afghan Khan², Muneer Baig¹
1 Department of Engineering Management, College of Engineering, Prince Sultan University, Riyadh, 11586, Saudi Arabia
2 Department of Mechanical Engineering, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, 50728, Malaysia
* Corresponding Author: Abdul Aabid. Email:
(This article belongs to this Special Issue: Materials, Energy, and Fluid Dynamics)

Fluid Dynamics & Materials Processing 2022, 18(6), 1877-1900. https://doi.org/10.32604/fdmp.2022.021860

Received 09 February 2022; Accepted 18 April 2022; Issue published 27 June 2022

Abstract

A method based on microjets is implemented to control the flow properties in a convergent-divergent nozzle undergoing a sudden expansion. Three different variants of this active control technique are explored numerically by means of a finite-volume method for compressible fluid flow: with the first one, the control is implemented at the base, with the second at the wall, while the third one may be regarded as a combination of these. When jets are over-expanded, the control is not very effective. However, when a favourable pressure gradient is established in the nozzle, the control becomes effective, leading to an increase in the base pressure.

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Keywords

Base pressure; supersonic flow; CFD; mach number; microjet control

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