Prediction method for full characteristic curve of centrifugal pump

Abstract

The invention discloses a method for predicting a full characteristic curve of a centrifugal pump, which comprises the following steps of: establishing a mathematical model for representing a water head full characteristic relation and a torque full characteristic relation of the centrifugal pump according to a similar law on the basis of an Euler equation during stable operation of the centrifugal pump and a flow velocity triangle of water flow at an impeller; centrifugal pump full characteristic curve data of various specific speeds are collected, a centrifugal pump full characteristic curve is transformed, and characteristic parameter values corresponding to characteristic working condition points on the transformed curve are extracted; establishing a relation function between the characteristic parameters of each characteristic working condition point and the specific speed of the centrifugal pump by adopting a nonlinear regression model; and substituting the relation function into a mathematical model for describing the full characteristics of the centrifugal pump, solving an undetermined coefficient in the model, and predicting a full characteristic curve of the centrifugal pump at any specific speed through inverse transformation. The method is high in theoretical property and simple in procedure, the problem that the centrifugal pump full characteristic curve cannot be obtained through linear interpolation in some projects is effectively solved, manpower and material resources are saved, and the project design process is accelerated.

Description

technical field [0001] The invention belongs to the research field of hydraulic mechanical characteristics, and relates to a theoretical calculation method for the full characteristic curve of a centrifugal pump, in particular to the full characteristics of the three areas of "turbine area", "dissipation area" and "water pump area" in the operating area of ​​the centrifugal pump Curve prediction method. Background technique [0002] Centrifugal pumps are indispensable basic equipment for cross-basin and regional water transfer, agricultural irrigation and drainage, industrial cooling cycles, and urban water supply and drainage. Their hydraulic performance is directly related to the operation safety and engineering benefits of water supply and drainage systems. Various performance parameters are very necessary. The full characteristic curve of a centrifugal pump is used to describe the relationship between the flow rate, head, speed and torque under the condition of variable...

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Problems solved by technology

[0004] The present invention aims to solve the problem that when the actual measured full characteristic curve of the centrifugal pump is lacking in the project, the traditional method of obtaining the full characteristic curve of the centrifugal pump by applying similar specific speed or linear interpolation will bring large errors to the simulation of the hydraulic transient process of the pumping station, which cannot Problems in effectively guiding engineering design

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