A Prediction Method for Pressure Fluctuation of Pumping Station Units Based on Computational Fluid Dynamics Instantaneous Calculation

Abstract

The present invention relates to a pressure pulsation prediction method of a pumping station unit based on computational fluid dynamics instantaneous calculation. Through the present invention, the three-dimensional modeling software is used to establish a model of the pumping station unit in equal dimensions, and the numerical solution method is used to perform multiple calculations on the pumping station unit model. Working condition calculation, by setting monitoring points to effectively monitor and collect the pressure pulsation at the special position of the unit, and analyze and predict the time spectrum diagram of the detection data, to make up for the single working condition and deficiency of the physical model test, and also to provide a safe and stable operation management for the pumping station unit , to provide guidance to avoid abnormal pressure pulsation. At the same time, the numerical simulation calculation can carry out calculation and analysis of multiple working conditions, and can calculate and analyze all the expected working conditions of the pumping station unit, greatly improving the prediction efficiency, simple and convenient, and low cost.

Description

technical field [0001] The invention relates to a method for predicting pressure fluctuations of pumping station units based on instantaneous calculation of computational fluid dynamics, belonging to the field of hydraulic engineering. Background technique [0002] In order to resist drought, waterlogging, flood and other disasters in the plain along the river, a large number of low-lift axial flow pumps for flood control and disaster reduction are distributed. The operation characteristics of the axial flow pump along the river are low head and large flow. At the same time, due to the change of the tidal level of the Yangtze River, the pump station often operates to an ultra-low head, or even zero head or negative head. Under this working condition, the axial flow pump seriously deviates from the design work. If the flow exceeds the design flow by more than 20% to 30%, it is very easy to induce abnormal water pressure pulsation, which will lead to strong resonance of the un...

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Problems solved by technology

[0005] The object of the present invention aims at the above-mentioned deficiencies in the prior art, and provides a method for predicting pressure fluctuations of pumping station units based on computational fluid dynamics instantaneous calculation. Establish a model, calculate the multi-working conditions of the pumping station unit model through the numerical solution method, effectively monitor and collect the pressure pulsation at the special position of the unit by setting monitoring points, and analyze and predict the time-spectrum diagram of the detection data to make up for the singleness of the physical model test Working conditions and deficiencies also provide guidance for the safe and stable operation management of pumping station units and avoid abnormal pressure pulsation

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