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Method for calculating slip velocity of particles in pump based on clean water internal flow

A technology of slip velocity and calculation method, which is applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc.

Active Publication Date: 2017-08-29
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] So far, there is no calculation method of particle slip velocity in the pump, only some calculations of particle slip velocity in horizontal pipes and vertical risers

Method used

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  • Method for calculating slip velocity of particles in pump based on clean water internal flow
  • Method for calculating slip velocity of particles in pump based on clean water internal flow
  • Method for calculating slip velocity of particles in pump based on clean water internal flow

Examples

Experimental program
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Effect test

Embodiment

[0034] A double-vane pump with a specific speed of 111, its design working condition: Q d =26m 3 / h, H=2.68m, n=750r / min.

[0035] Step 1. Use high-speed photogrammetry to measure the trajectory and velocity distribution of particles in the pump.

[0036] (1) Selection of measurement area and particles with different physical properties.

[0037] Select the middle section of the double vane pump as the measurement plane, such as figure 2 shown. The impeller rotates clockwise, and the angle between the suction surface of the blade facing the tongue and the X axis is θ=28°.

[0038] Select spherical rubber ball particles with a density slightly greater than that of fluid medium water, with a particle size of 12mm and a density of 1.09g / mm 3 , 1.2g / mm 3 , 1.75g / mm 3 .

[0039] (2) The measurement method of the velocity field in the pump.

[0040] The particle motion in the pump is measured using the phase averaging method. The absolute velocity field of the two-phase f...

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Abstract

The invention discloses a method for calculating the slip velocity of particles in a pump based on a clean water internal flow. The method comprises the steps: measuring the movement track and speed distribution of particles of a two-phase flow in the pump through high-speed photographing; writing a high-speed two-phase flow high-speed photographing image processing program through MATLAB and C programming languages, and calculating the instantaneous relative speed of the particles in the pump; Carrying out the numerical calculation of the flowing condition of clean water in the pump through a CFD method, and obtaining the relative speed of a liquid point at a position where the particles are located; building a function relation of a particle w and liquid w according to Weibull distribution; building a particle speed calculation formula based on the speed of the liquid point; and building a calculation formula for the slip velocity of the particles in the pump according to the definition of the slip velocity of the particles. The method can achieve the more accurate calculation of the moving speed of the particles in the pump according to the clean water internal flow, solves the slip velocity of the particles in the pump based on the above, and achieves the effective evaluation and prediction of the conveying performances of particle mediums with different physical properties.

Description

technical field [0001] The invention belongs to the research field of solid-liquid two-phase flow in a pump, and in particular relates to a method for calculating the slip velocity of particles in a pump based on the calculation of clean water internal flow. Background technique [0002] When the pump is transporting solid-liquid two-phase flow, there is a certain speed difference between the moving speed of the particles and the moving speed of the surrounding liquid particles, and this speed difference is the particle slipping speed. The particle slip velocity can more accurately describe the performance of the pump when delivering solid-liquid two-phase flow, and can effectively predict the performance of the pump when delivering particle two-phase flow. There is a certain relationship between the particle velocity and the liquid particle velocity. If this relationship is expressed by a functional relationship, the movement velocity of the liquid medium can be obtained by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/00
Inventor 谈明高季燕羽刘厚林吴贤芳王凯董亮王勇
Owner JIANGSU UNIV
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