Sediment Erosion Characteristics and Mechanism on Guide Vane End-Clearance of Hydro Turbine
Source abstract
Abstract
Sediment erosion caused by the collision of solid particles is a challenge for the safety, reliability, unit efficiency, and vibration noise of the hydroelectric engineering system located at China’s Yellow River and northwest inland basin. The sediment-laden flow of the guide vane end-clearance of the Francis Turbine at Dongshuixia hydroelectric station was used as the research object, and the large eccentric shaft structure of a guide vane was considered. Numerical calculations with the large eddy simulation (LES) and discrete phase models (DPMs) were carried out to study the erosion characteristics and mechanism of the end-surface of the guide vane and head cover, the flow mechanism of adverse erosion behind the shaft, and the influence law of the turbulence integral scale, turbulent kinetic energy, and turbulent flow angle on erosion. The flow field with a 1 mm clearance should set the number of particle trajectory per unit inlet area at about 1/mm2 to ensure the accuracy of calculation. The von Kármán vortex street is the main reason for adverse erosion behind the shaft and the low frequency energy of the turbulence plays a leading role in erosion. The above results provide a reference for the optimization design of an anti-wear guide vane and wear-protection of the clearance with sediment-laden water.
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Research context
OpenAlex topics: Erosion and Abrasive Machining · Particle Dynamics in Fluid Flows · Coal Combustion and Slurry Processing
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Lanzhou University of Technology, College of Energy and Power Engineering, Lanzhou 730050, China
Key Laboratory of Fluid Machinery and Systems, Lanzhou 730050, China
Lanzhou University of Technology, College of Electrical and Information Engineering, Lanzhou 730050, China
Gansu Shengyu Water Conservancy and Hydropower Technology Co. Ltd., Lanzhou 730090, China
Funding
National Key R&D Program Projects of China · National Natural Science Foundation of China · Science and Technology Planning Project of Gansu of China
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