Pump station approach channel and forebay sand-containing moving bed surface flow velocity distribution determination method and device

Abstract

The embodiment of the invention provides a pump station approach channel and forebay sand-containing moving bed surface flow velocity distribution determination method and device, and the method comprises: obtaining a reciprocating flow outer boundary layer flow velocity, a flow period, a sediment particle size, a ratio of sediment to water density through measurement, and obtaining a sand-containing moving bed surface friction factor, a Sierz number and a sediment sedimentation velocity; and further obtaining a phase difference and a phase lead of the flow velocity section of the sand-containing moving bed surface. Related phase difference and phase lead are determined, the influence of phase difference on flow velocity distribution is reflected, phase residue and phase drift of relativeflow velocity of the reference surface position of flow velocity distribution in the reciprocating flow process are reflected, asymmetry of flow velocity distribution of the moving bed surface in theflow acceleration and deceleration stages is reflected, the flow velocity prediction capacity of a high-sand-content area near the moving bed surface is improved, and the upper bound of the flow velocity is accurately captured.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of water conservancy engineering, and more specifically, relate to a method and device for determining the flow velocity distribution of a pumping station diversion canal and a forebay sand-containing dynamic bed surface. Background technique [0002] The connection building between the end of the diversion channel of the non-pressure diversion hydropower station and the inlet of the pressure water pipe, also known as the pressure forebay. In the sediment engineering design of the diversion channel and forebay of the pumping station, it is very important to determine the flow velocity distribution on the sandy moving bed surface, which is the basis for judging the flow pattern and the suspended sediment content near the sandy moving bed surface. [0003] In the current pumping station design, there have been works to estimate the velocity distribution of the sandy moving bed surface...

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Problems solved by technology

But so far, how to analytically give the flow velocity distribution of the sandy moving bed surface under the condition of reciprocating flow, which reflects the phase difference and phase advance, has not yet had any achievements and methods for reference.

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