A flow guide device for suppressing vortex band and cavitation of a draft tube and a control method thereof

By combining a cross-shaped guide structure with an intelligent control system, the angle of the guide plate is adjusted in real time, which solves the problems of vortex bands and cavitation in the turbine tailrace, improves the stability and efficiency of the unit, and reduces equipment damage and operating costs.

CN122106805APending Publication Date: 2026-05-29CHINA YANGTZE POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA YANGTZE POWER
Filing Date
2026-03-25
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Large mixed-flow turbines exhibit vortex and cavitation problems in their tailrace under different load conditions, leading to unit vibration, output oscillation, and reduced efficiency. Existing air supply equipment increases system instability and equipment damage.

Method used

It adopts an adjustable cross-shaped flow guide structure and intelligent control system. Through the central control system, the unit online monitoring system and water flow direction sensor, the angle of the flow guide plate is adjusted in real time. Combined with the segmented center body and flow guide plate, it can adapt to the suppression of vortex bands and cavitation under different operating conditions.

Benefits of technology

It effectively suppresses vortex bands and cavitation, improves the stability and efficiency of unit operation, reduces downtime due to malfunctions, lowers equipment maintenance costs, optimizes water flow patterns, and improves energy recovery efficiency.

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    Figure CN122106805A_ABST
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Abstract

The application provides a guide device for inhibiting vortex band and cavitation of a draft tube and a control method thereof, comprising a cross-shaped guide structure arranged in a straight conical section of a draft tube of a water turbine, and a runner arranged above the straight conical section; the cross-shaped guide structure comprises a center body, two guide plates and a fixing part; the center body is located directly below a draft cone of the runner, has a length consistent with that of the straight conical section of the draft tube, and comprises an upper funnel-shaped part, a middle columnar part and a lower conical part; the cross-shaped guide structure is combined with the segmented center body; the center body can effectively inhibit columnar vortex band under high load conditions; the cross-shaped guide plates can specifically inhibit spiral vortex band under low load conditions; meanwhile, the water flow state is optimized, water flow separation is reduced, cavitation is effectively inhibited, draft tube pressure pulsation and unit vibration are reduced, blade damage is avoided, the service life of the unit is prolonged, and according to the results of relevant simulation tests, the amplitude of the draft tube pressure pulsation can be reduced.
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