Method for predicting transient fluid-solid coupling characteristic of centrifugal pump rotor

Abstract

The invention discloses a method for predicting a numerical value of a transient fluid-solid coupling characteristic, and belongs to the technical field relevant to the mechanical flow induced vibration of pumps. The method mainly comprises the following three steps: calculating the transient fluid-solid coupling of an one-way and a bidirectional total fluid fields; measuring and processing the vibration data of a rotor; and comparing a predication result of the numerical value of the transient fluid-solid coupling with an experimental result. An coupling method can be selected flexibly. When the structure deformation quantity is not clear, the one-way coupling analysis is carried out firstly; if the predicted structure deformation has a big influence on the fluid field, the bidirectional coupling analysis is utilized. During the coupling calculation process, firstly, the transient fluid field calculation is carried out, and the load is added to a finite element model through interpolation calculation of an coupling interface so as to carry out a dynamic structural analysis. The convergence of data transmission of the coupling interface is judged, if the coupling calculation is not converged, fluid grids are recalculated according to the structural deformation, and then the coupling iteration for a time step is continued.

Description

technical field [0001] The invention belongs to the technical field related to the incompressible transient turbulent flow field inside the pump machinery and its induced vibration, and introduces the fluid-solid coupling theory and method for calculation and analysis. Background technique [0002] Pumps are important energy conversion devices and fluid delivery equipment, among which centrifugal pumps are the most widely used. Centrifugal pumps are not only used in industrial and agricultural fields such as petroleum, chemical industry, and water conservancy, but also are key equipment in high-tech fields such as aviation, ships, and submarines. Centrifugal pumps will inevitably generate vibration during operation, which will affect the stability and safety of centrifugal pump operation and affect the life of the machine. In defense equipment such as ships and submarines with high concealment, the vibration and noise of centrifugal pumps will directly affect their safety. ...

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Problems solved by technology

At present, among these patents, there is no declared patent on the numerical prediction method of the flow-induced vibration of the centrifugal pump. At the same time, there is no prediction method for the fluid-solid coupling phenomenon of the rotating machine with incompressible fluid water as the working medium.

In addition, there are no corresponding experimental verification steps for the above fluid-solid coupling prediction methods, which cannot ensure the accuracy of the prediction to the greatest extent.

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