A dynamic performance determination method suitable for multistage centrifugal pump smooth mouth ring

Abstract

The invention provides a dynamics performance determination method applicable to the smooth choma of a multistage centrifugal pump; the dynamics performance determination method is based on a short sealing theory and a finite length theory, and comprises the following steps that (1) the structural parameters of the choma of a high-pressure multi-stage centrifugal pump impeller are determined by a length measuring tool, and the operation conditions of the centrifugal pump are determined; (2) a control equation group which comprises a continuity equation, a circumferential momentum equation and an axial momentum equation is established; (3) the control equation group is simplified in a dimensionless way, and a differential equation group of an original equation group about the first and zero order forms of perturbation is worked out through a perturbation method; (4) the dimensionless differential equation after simplification is solved through a shooting method, and the dynamic characteristic coefficient of the choma of the high-pressure multi-stage centrifugal pump is finally determined. The dynamics performance determination method applicable to the smooth choma of the multistage centrifugal pump is used for determining the dynamics performance of the choma of the high-pressure multi-stage centrifugal pump, has a wider scope of application, and has more accurate calculation results.

Description

technical field [0001] The invention relates to the field of determination of dynamic performance, and more specifically relates to a determination method of dynamic performance suitable for smooth mouth rings of multistage centrifugal pumps. Background technique [0002] The determination of the dynamic performance of the smooth mouth ring of the existing high-pressure multistage centrifugal pump mostly relies on the traditional short seal method or the use of computational fluid dynamics software. The short seal solution method ignores the tangential velocity close to the two sides during the solution process, and simplifies the fluid motion equation in the seal to a large extent, which has great limitations in solving the mouth ring seal with the length-to-diameter ratio greater than 0.25; the calculation The fluid dynamics software analysis method has high requirements for engineering calculation personnel, and requires multiple steps such as modeling and solving, and th...

AI Technical Summary

Problems solved by technology

The short seal solution method ignores the tangential velocity close to the two sides during the solution process, and simplifies the fluid motion equation in the seal to a large extent, which has great limitations in solving the mouth ring seal with the length-to-diameter ratio greater than 0.25; the calculation The fluid dynamics software analysis method has high requirements for engineering calculation personnel, and requires multiple steps such as modeling and solving, and the selection of the turbulence model is highly professional and the calculation cycle is long.

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