Method and device for measuring Dean vortex motion information
A motion information, measuring device technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of enhancing the measurable speed range and spatial resolution
Active Publication Date: 2021-01-15
JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH +1
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Problems solved by technology
[0006]
At present, the research on Dean vortex mainly adopts numerical methods, and there are few reports on the measurement of the motion information of Dean vortex existing in the pump system.
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[0047] Such as figure 1 with figure 2 As shown, this embodiment provides a measuring device for Dean vortex motion information, which is mainly used for measuring the Dean vortex in the U-shaped pipe in the pump system. The device includes: U-shaped pipe 3, sleeved in U Uncovered square box 1 in the inlet area of the U-shaped round tube and an uncovered hexagonal box 2 set in the U-shaped round tube Dean vortex area; the uncovered square box 1 is used to measure the mainstream inlet area; the uncovered hexagonal box 2 is used to measure the Dean vortex generation area.
[0048] Optionally, the square box 1 without a cover, the hexagonal box 2 without a cover and the U-shaped round tube 3 are all made of transparent organic glass.
[0049] Optionally, the side length of the square box without a cover is 3 to 4 times the inner diameter of the U-shaped round tube;
[0050] The distance between the side length of the square box without a cover and the center of the U-shaped ...
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The invention provides a method and a device for measuring Dean vortex motion information. The method and the device are mainly used for measuring Dean vortexes of a U-shaped circular pipe in a pump system. The measurement method comprises the following steps: establishing a Dean vortex measurement system which mainly comprises the U-shaped circular tube, an uncovered square box sleeved in an inlet area of the U-shaped circular tube and an uncovered hexagonal box sleeved in the U-shaped circular tube; filling the uncovered square box and the uncovered hexagonal box with a sodium iodide solution as a flowing medium; sequentially shooting particle images of the key sections of the measurement area by adopting PIV; based on an improved PIV cross-correlation algorithm, establishing a multi-grid query area deformation technology based on a multi-level grid iteration method and a grid deformation algorithm, and achieving programming of the multi-grid query area deformation technology on PIVlab; and averaging the particle images on the basis to obtain average velocity distribution of a main flow region and eddy current distribution of a Dean measurement region. According to the invention, high-precision measurement of Dean vortexes can be realized, and the spatial resolution of a PIV cross-correlation algorithm can be enhanced.
Description
technical field [0001] The invention relates to the field of hydromechanical test and measurement, in particular to a method and device for Dean vortex motion information. Background technique [0002] Elbows are widely used in many fields of industrial applications, such as water conservancy, chemical industry, petroleum, power and other engineering fields involving pipeline transportation of fluids. [0003] U-shaped round pipes are common typical accessories in pump piping systems. In engineering, U-shaped round pipes are often used due to structural needs to change the flow direction of fluids or to enhance heat and mass transfer processes. U-shaped round tubes are used in U-shaped tube heat exchangers and various pump pipe network systems. [0004] Due to the effect of the curvature of the U-shaped tube, a Dean vortex will be generated in the U-shaped tube under certain conditions, which will change the velocity field and pressure field in the tube. The generation of ...
Claims
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IPC IPC(8): G06F30/18G06F30/23G06F30/25G06F113/14
CPCG06F30/18G06F30/23G06F30/25G06F2113/14Y02E30/30
Inventor 王凯刘厚林马皓晨谈明高王勇董亮
Owner JIANGSU UNIV ZHENJIANG RES INST OF FLUID ENG EQUIP TECH