A method for determining the position of two holes punched in the water discharge cone of a water turbine

Abstract

The invention provides a method of determining positions of two holes drilled in a runner cone of a water turbine. The method comprises the following steps: numerical simulation calculation is carried out by adopting a numerical simulation method and the scope of a low pressure area of the runner cone is obtained, a detail part of a tail water vortex strip is observed by employing a high-speed photography imaging system and a place where the vortex strip is initially formed is determined, and a drilling measure is implemented according to the place where the vortex strip is initially formed, wherein the drilling measure comprises the step of drilling the two holes in the runner cone, and the runner cone in which the two holes are drilled is structured in an oppositely perforating manner along a short straight type axle center of the runner cone. The nonsteady flow problem in a water turbine unit in the prior art is solved, and particularly the problem of the vortex strip in a draft tube and the corresponding pressure pulsation problem are solved.

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 two 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 fluc...

AI Technical Summary

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 2 holes of the hydraulic turbine discharge cone, and to solve the unsteady flow problem inside the hydraulic turbine unit, especially the vortex belt and the corresponding pressure fluctuation in the draft tube question

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