A measurement method of 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 analysis, etc., to achieve the effect of improving measurement accuracy and accuracy
Active Publication Date: 2021-09-17
JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH +1
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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
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[0033] What Echo-PIV system adopted in the present embodiment is the commercial ultrasonic equipment of U.S. Capistrano laboratory, and the center frequency of transducer is 12.5MHz, and ultrasonic beam comprises 64 vectors, and display angle is 20 °, and particle image is collected by PCI card and is displayed on In the computer; the optical PIV system adopts the commercial TR-PIV system of TSI Company in the United States, in which 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, frame rate is 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 pumps, piping systems, valves, flow meters and water tanks, in which the water pumps and piping systems are made of transparent plexiglass.
[0035] (2) The Echo-PIV particle i...
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A method for measuring solid-liquid two-phase flow in a water pump system based on Echo-PIV. The specific process is: establish a visual water pump system suitable for Echo-PIV measurement; correct Echo-PIV based on multiple iterative algorithms and sub-pixel edge detection methods Particle image cross-correlation algorithm, combined with filtering and bilinear interpolation functions to eliminate false vectors; establishment of Echo-PIV velocity correction formula; BEM-based inversion algorithm to correct the velocity vector of Echo-PIV measurement failure area; analysis of ultrasonic scanning depth under clear water conditions The influence of angle and angle on Echo-PIV measurement results; determine the best interrogation area range suitable for Echo-PIV measurement of solid-liquid two-phase flow in water pump system; establish a method for extracting the image boundary of water pump system Echo-PIV based on contour wavelet transform algorithm; ‑PIV conducts experimental measurements on the solid-liquid two-phase flow in the pump system, and analyzes the movement mechanism of the solid phase in the pump system with different particle sizes and different volume fractions. The invention can not only accurately measure the law of solid-liquid two-phase flow in the water pump system, but also improve the measurement accuracy of Echo-PIV.
Description
technical field [0001] The invention belongs to the field of hydraulic machinery experiment measurement, and in particular relates to a method for measuring solid-liquid two-phase flow in a water pump system based on Echo-PIV. Background technique [0002] Experimental measurement can intuitively 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 pump internal flow field testing, relatively mature technologies include optical PIV (Particle Image Velocimetry) and high-speed photography, but both 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 the experimental measurement of solid-liquid two-phase flow purely based on optics is not convincing. [0003] At present, Echo-PIV (Echo Particle Image Vel...
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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