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Core-pressure alleviation for a wall-normal vortex by active flow control

Published online by Cambridge University Press:  23 August 2018

Qiong Liu ,
Byungjin An ,
Motohiko Nohmi ,
Masashi Obuchi  and
Kunihiko Taira Open the ORCID record for Kunihiko Taira [Opens in a new window]
Qiong Liu
Affiliation:
Department of Mechanical Engineering, Florida State University, Tallahassee, FL 32310, USA
Byungjin An
Affiliation:
Advanced Analysis Department, Ebara Corporation, Tokyo, 144-8510, Japan
Motohiko Nohmi
Affiliation:
Advanced Analysis Department, Ebara Corporation, Tokyo, 144-8510, Japan
Masashi Obuchi
Affiliation:
Advanced Analysis Department, Ebara Corporation, Tokyo, 144-8510, Japan
Kunihiko Taira*
Affiliation:
Department of Mechanical Engineering, Florida State University, Tallahassee, FL 32310, USA
*
†Email address for correspondence: ktaira@fsu.edu
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Abstract

We consider the application of active flow control to modify the radial pressure distribution of a single-phase wall-normal vortex. The present flow is based on the Burgers vortex model but with a no-slip boundary condition prescribed along its symmetry plane. The wall-normal vortex serves as a model for vortices that emerge upstream of turbomachinery, such as pumps. This study characterizes the baseline vortex unsteadiness through numerical simulation and dynamic mode decomposition. The insights gained from the baseline flow are used to develop an active flow control technique with rotating zero-net-mass blowing and suction with the objective of modifying the core-pressure distribution. The effectiveness of the control strategy is demonstrated by achieving a widened vortex core with increased pressure. This change in the flow field weakens the local strength of the wall-normal vortex core, potentially inhibiting the formation of hollow-core vortices, commonly encountered in liquids.

JFM classification

Flow Control: Flow Control Vortex Flows: Vortex dynamics Vortex Flows: Vortex instability
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 853 , 25 October 2018 , R1
Copyright
© 2018 Cambridge University Press 

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