Steady numerical calculation-based hydraulic stability analysis method for pump device

Abstract

The invention relates to a hydraulic stability analysis method for a pump station, in particular to the pump station for multi-mode operation and belongs to the technical field of hydraulic engineering pump stations. Tangential speeds of various points of an inlet section of an outlet passage are obtained on the basis of a three-dimensional steady numerical calculation result of the whole passage of a pump device; a calculation formula of a momentum parameter SM is built; and the tangential speed of the inlet section of the outlet passage is determined by the calculation formula of the momentum parameter SM. The method is advanced and scientific; by the method, the hydraulic stability of the pump device in different schemes can be comprehensively compared; the oneness that only the efficiency of the pump device is adopted as an evaluation index is avoided; the problems of long elapsed time and high requirements on hardware equipment when the whole passage of the pump device is determined by a three-dimensional unsteady numerical calculation method are solved; quick analysis on the actual hydraulic stability of the pump station is facilitated; the time period of comparing pump station schemes is shortened; the target of quickening the engineering scheme selection progress of the pump station is achieved; and a reliable method is also provided for optimization of the pump device in different schemes.

Description

technical field [0001] The invention relates to an analysis method for the hydraulic stability of a pumping station, especially for a pumping station operating under multiple working conditions, and belongs to the technical field of hydraulic engineering pumping stations. Background technique [0002] The stability of the pumping station unit is manifested in two aspects: the hydraulic vibration and the mechanical and electrical vibration of the unit. The influence of the mechanical and electrical vibration is already very small and there are many preventive and improvement measures. The cause of the hydraulic vibration is the internal flow state of the pump device. of. In recent years, some domestic pumping stations have experienced vibration problems, which not only affect the normal production tasks, but some even endanger the safe operation of the pumping stations. Therefore, the hydraulic stability of pumping devices has caused widespread concern in pumping device desig...

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Problems solved by technology

[0003] The purpose of the patent of the present invention is to provide a simple and reliable analysis method for the hydraulic stability of the pump device under multiple working conditions in view of the above-mentioned problems in the analysis of the hydraulic stability of the actual engineering pump device, which mainly solves two problems: ① solves the problem of the pump device Hydraulic stability analysis is time-consuming and requires high hardware requirements; ② An analysis method for hydraulic stability comparison of multi-working conditions and multi-scheme pump installations is proposed

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