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Research on Taylor Vortex in the air-gap of flywheel energy storage systems.

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Title: Research on Taylor Vortex in the air-gap of flywheel energy storage systems.
Authors: Pan, Wenli1,2 (AUTHOR), Ma, Jianlong1,2,3 (AUTHOR) ma_jianlong@yeah.net, Zhang, Qian4 (AUTHOR), Zhang, Weiwei1,2,3 (AUTHOR), Ma, Rui1,2,3 (AUTHOR)
Source: International Communications in Heat & Mass Transfer. May2025:Part A, Vol. 164, pN.PAG-N.PAG. 1p.
Subjects: Taylor vortices, Energy storage, Electric power distribution grids, Contours (Cartography), Buoyancy
Abstract: Flywheel energy storage systems (FESSs) are integral to renewable energy integration in power grids, effectively mitigating wind and solar curtailment while stabilizing grid fluctuations. The thermal performance of FESSs particularly in low-pressure environments is often overlooked. Based on the operational similarity between FESSs and Taylor vortex reactors, this study investigates the flow characteristics of air-gap. The findings reveal the formation of Taylor vortex structures in the air-gap, occurring in the absence of axial buoyancy within the system's enclosed space. A distinct "C"-shaped vortex appeared in the upper flow field. Notably, the number of Taylor vortices correlated consistently with the number of high-velocity contour maps. With increasing rotation speed, the axial length of Taylor vortices decreased, leading to more compact structures, and both positive and negative vortices converged towards the central zone. Additionally, in the absence of Taylor vortices, two inflection points of the strong disturbance region emerged at the radial positions RB* = 0.27 and RB* = 0.81 in the air-gap between the stator and rotor, where groove-induced vortices dominated the flow field. As the rotation speed increased, the inflection points shifted towards the center, the width of the strong disturbance region near the wall expanded, and the vortex structures elongated axially. • The difference between the number of Taylor vortex and the number of "peak-shaped"high-value zone is one. • The axial length of Taylor vortex reduces and becoming more compact as the rotation speed increases. • Two inflection points (R B * = 0.27 and R B * = 0.81) of strong disturbance region move towards the middle zone as the rotation speed increases. • The vortex structure elongates at the axial direction in the groove structure of air-gap B. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Flywheel energy storage systems (FESSs) are integral to renewable energy integration in power grids, effectively mitigating wind and solar curtailment while stabilizing grid fluctuations. The thermal performance of FESSs particularly in low-pressure environments is often overlooked. Based on the operational similarity between FESSs and Taylor vortex reactors, this study investigates the flow characteristics of air-gap. The findings reveal the formation of Taylor vortex structures in the air-gap, occurring in the absence of axial buoyancy within the system's enclosed space. A distinct "C"-shaped vortex appeared in the upper flow field. Notably, the number of Taylor vortices correlated consistently with the number of high-velocity contour maps. With increasing rotation speed, the axial length of Taylor vortices decreased, leading to more compact structures, and both positive and negative vortices converged towards the central zone. Additionally, in the absence of Taylor vortices, two inflection points of the strong disturbance region emerged at the radial positions RB* = 0.27 and RB* = 0.81 in the air-gap between the stator and rotor, where groove-induced vortices dominated the flow field. As the rotation speed increased, the inflection points shifted towards the center, the width of the strong disturbance region near the wall expanded, and the vortex structures elongated axially. • The difference between the number of Taylor vortex and the number of "peak-shaped"high-value zone is one. • The axial length of Taylor vortex reduces and becoming more compact as the rotation speed increases. • Two inflection points (R B * = 0.27 and R B * = 0.81) of strong disturbance region move towards the middle zone as the rotation speed increases. • The vortex structure elongates at the axial direction in the groove structure of air-gap B. [ABSTRACT FROM AUTHOR]
ISSN:07351933
DOI:10.1016/j.icheatmasstransfer.2025.108804