Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments

Author:

Urban Ondřej1ORCID,Kurková Michaela1ORCID,Pochylý František1ORCID

Affiliation:

1. Brno University of Technology, Faculty of Mechanical Engineering, Energy Institute, Viktor Kaplan Department of Fluid Engineering, Technická 2896/2, 616 69 Brno, Czech Republic

Abstract

This work is focused on reduction of swirling in cases from hydraulic machinery and, thus, mitigation of instabilities associated with swirling flow. We study this problem analytically using the torque integral equation, numerically using computational fluid dynamics (CFD) simulations, and experimentally using a swirl generator that generates swirling flow approximating that in a draft tube of a hydro turbine operating at a part load, featuring an unsteady spiral vortex—the vortex rope. The analytical description elucidates the effect of different installations on the circumferential velocity. Unconventional conical perforated installations targeting at increasing the dissipation were proposed and tested. The rather unsatisfactory results led to proposing fins placed unconventionally away from the wall, closer to the diffuser axis, which were subsequently shown to be able to reliably suppress the unsteady vortex rope. Their effect is documented by an analysis of CFD results including the proper orthogonal decomposition as well as experimental observations and measurements.

Funder

Technology Agency of the Czech Republic

Publisher

AIP Publishing

Subject

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

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