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A method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV

A technology of water pump system and measurement method, which is applied in the direction of pump testing, liquid variable capacity machinery, image data processing, etc., to achieve the effect of improving measurement accuracy and accuracy

Active Publication Date: 2019-01-18
JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there is no public report on the measurement method of solid-liquid two-phase flow in the water pump system based on Echo-PIV, compared with the more mature optical particle image velocity measurement technology at present, because ultrasonic waves can penetrate opaque media, this technology is very effective in realizing non-transparent Great advantage in non-intrusive measurement of fluid velocity fields

Method used

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  • A method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV
  • A method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV
  • A method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV

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Embodiment

[0033] In this embodiment, the Echo-PIV system adopts the commercial ultrasonic equipment of Capistrano Laboratory in the United States. The center frequency of the sensor is 12.5MHz, the ultrasonic beam contains 64 vectors, the display angle is 20°, and the particle image is collected by the PCI card and displayed on the In the computer; the optical PIV system adopts the commercial TR-PIV system of TSI Company in the United States. The pulse energy of the YAG high-frequency dual-cavity pulsed laser is 2×22.5mJ@1000Hz, the output wavelength is 527nm, and the resolution of the PowerView digital CCD camera is 1024×1024 pixels with a frame rate of 3kHz.

[0034] (1) Establish a visual water pump system suitable for Echo-PIV measurement (such as figure 2 shown). The visualized water pump system includes water pump, piping system, valve, flow meter and water tank, wherein the water pump and piping system are all made of transparent plexiglass.

[0035] (2) Modified Echo-PIV part...

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Abstract

The invention provides a method for measuring solid-liquid two-phase flow in water pump system based on Echo-PIV. The procedure is as follows: establishing a visual pump system suitable for Echo-PIV Measurement; correcting Echo-PIV particle image cross-correlation algorithm ,based on multi-iteration algorithm and sub-pixel edge detection method, by combining with filtering and two-line interpolation function, eliminating pseudo-vector; establishing Echo-PIV velocity correction formula; using BEM-based inversion algorithm to modify velocity vector of Echo-PIV measurement failure zone; analyzingThe influence of ultrasonic scanning depth and angle on Echo-PIV measurement results; determining optimal query region scope of solid-liquid two-phase flow Echo-PIV measurement in pump system; basedon contour wavelet transform algorithm, establishing pump system Echo-PIV image boundary extraction method; based on Echo- PIV, testing and measuring the solid-liquid two-phase flow in the pump system, and analyzing the mechanism of solid phase movement in the pump system under different particle size and different volume fraction. The invention not only can accurately measure the solid-liquid two-phase flow rule in the pump system, but also can improve the efficiency of Echo-PIV measurement accuracy.

Description

technical field [0001] The invention belongs to the field of hydraulic mechanical experiment measurement, and particularly relates to a method for measuring solid-liquid two-phase flow in a water pump system based on Echo-PIV. Background technique [0002] The test measurement can directly and accurately reflect the real physical form of the flow field, and is the most reliable method to reveal the flow mechanism of the pump system. At present, in the field of internal flow field testing of pumps, the more mature technologies include optical PIV (ParticleImage Velocimetry) and high-speed photography, but both of these methods require that the area to be tested must be a transparent flow field to ensure that light passes through, and it is difficult to restore solid-liquid The real physical environment of two-phase flow, so purely optical-based solid-liquid two-phase flow test measurement lacks certain convincing. [0003] At present, Echo-PIV (Echo Particle Image Velocimetr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/13G06T7/168F04B51/00
CPCF04B51/00G06T2207/10132G06T2207/20064G06T7/13G06T7/168
Inventor 王凯张子旭刘厚林谈明高王勇董亮芦鑫景玉成
Owner JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH
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