A Method for Determining the Position of Drilling 4 Holes of Water Turbine Drain Cone

Abstract

The invention provides a position determination method for drilling four holes in a runner cone of a water turbine. The method comprises the steps that numerical simulation calculation is carried out by adopting a numerical simulation method to obtain a low-pressure area range of the runner cone; the detail of a vortex strip of tail water is observed by utilizing a high-speed photography imaging system to determine the position where the vortex strip is initially generated; and punching operation is performed according to the position where the vortex strip is initially generated, specifically the four holes are drilled in the runner cone, the runner cone with the four holes to be drilled is punched into the runner cone with two holes which are drilled oppositely along the axis of the short and straight runner cone, and on the basis of the runner cone with the two holes, the other two holes are further drilled vertically and oppositely in the positions relatively close to the lower parts of the previous two holes. The method solves the problem of unsteady flow in a water turbine set in the prior art, and especially the problems of the vortex strip in a draft tube and corresponding pressure pulsation.

Description

technical field [0001] The invention belongs to the technical field of water turbine stability, and in particular relates to a method for determining the position of four holes drilled by a water turbine discharge cone. Background technique [0002] Today, as the importance of hydropower generation becomes increasingly prominent, the requirements for improving the operating efficiency of hydropower stations and the stability of hydraulic turbines have become particularly prominent. Among the factors affecting the stable operation of the turbine, the hydraulic factor is the most prominent, including the dynamic and static interference between the rotating part and the stationary part, the shedding of the blade surface, the cavitation blade path vortex, and the cavitation draft tube vortex belt, etc. During the operation of the turbine, most of these flow phenomena occur in off-the-shelf conditions that deviate from the design conditions, which will induce serious pressure flu...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, to provide a method for determining the position of the 4-hole drilling of the water turbine discharge cone, and to solve the problem of unsteady flow inside the water turbine unit, especially the vortex in the draft tube and the corresponding pressure pulsation question

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