A floating net vortex elimination method used before the water inlet

Abstract

The invention relates to a floating net vortex eliminating method applied in front of a water inlet. The method comprises the following steps: (1) firstly, a water level with stronger and stable serial inspiration vortex in front of the water inlet is observed through visual inspection; and meanwhile, the position and the diameter size of the vertical shaft vortex in front of the water inlet are determined; (2) the diameter size of the vertical shaft vortex is determined through visual inspection to produce a floating net with an edge length L=(3.0-5.0) D vortex max; (3) the vortex eliminating mounting position of the floating net, produced in the step (2), on the water surface in front of the water inlet is determined according to the position, of the vertical shaft vortex in front of the water inlet, determined through visual inspection in the step (1); and (4) the floating net produced in the step (2) is fixedly mounted in the position of the water surface with the vertical shaft vortex in front of the water inlet determined in the step (3). The method has the following prominent characteristics: after the vertical shaft vortex is discovered in front of the water inlet in engineering operation, the vortex eliminating floating net is produced according to actual conditions and mounted according to the vortex generation position, so that the pertinence is higher.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, in particular to a vortex elimination method for a floating net before a water inlet. Background technique [0002] The vertical axis vortex in front of the water inlet of hydraulic engineering buildings, that is, the free water surface vortex, sometimes occurs in front of the water inlets of hydropower station diversion pipes, diversion tunnels, spillways, and large water pumps. The existence of the vertical axis vortex will deteriorate the flow state of the water inlet, reduce the flow capacity, reduce the efficiency of the unit, intensify the pulsation of the water flow, entrain the floating objects and block or damage the trash rack, etc., which will bring serious damage to the water conservancy project buildings and electromechanical equipment. harm and cause huge economic losses. [0003] The research shows that the induction of the vertical axis vortex is mainly affe...

AI Technical Summary

Problems solved by technology

However, as far as the current research level is concerned, it is still an unsolved problem to predict the vertical axis vortex in front of the water inlet.

Due to the scale effect of the vortex, the vertical axis vortex was successfully eliminated in the model test, which cannot guarantee that it can be effectively controlled and eliminated in actual engineering

The actual problem is: before the construction and operation of the project, it is difficult to predict whether there will be a vertical axis vortex phenomenon in front of the water inlet, which water level and flow conditions it may occur in, etc.

However, the realization of this design requires an underwater structure with a certain strength. If it is modified after completion, the amount of work will be large, the cost will be high, and it will be difficult to realize

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