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Flow field visualization method and device

A visualization and flow field technology, applied in the direction of measuring devices, particle motion records, instruments, etc., can solve problems such as residual errors, high prices, and affecting the accuracy of results, and achieve the effect of reducing system costs

Inactive Publication Date: 2007-11-28
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of particle image velocimetry (PIV) are: 1. It is expensive. At present, the cheapest domestic PIV system costs more than 500,000 yuan, and the imported price is higher, all of which are more than one million yuan; 2. The flow field of PIV The calculation of display and velocity is based on the principle of cross-correlation of display particles, and the flow trajectory and velocity of particles are obtained through complex calculations such as Fourier integral transformation. This calculation affects the accuracy of the results due to residual errors.

Method used

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  • Flow field visualization method and device

Examples

Experimental program
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Embodiment 1

[0021] The visualization system consists of 1 camera, 2 light sources, 3 shading plates, 8 light transmission slots, 4 condenser mirrors, 5 particle containers, the observed fluid and display particles, and an installation platform 7. The installation structure is shown in Figure 1. The light source 2, the condenser lens 4 and the camera 1 can move on the platform 7 so as to obtain the best lighting and imaging effect. The display particles are mixed evenly by 80g206 polystyrene, 10g nylon and 10g fluorescent powder, heated at 210°C to fully fuse, and then granulated by a granulator after fusion, the particle diameter is 0.8mm, and the density is 1.05g / cm 3 . The fluid medium is water, and edible salt is added to adjust the density to 1.05g / cm 3 . The fluid is contained in a glass beaker with a diameter of 120mm and a height of 160mm. Add shading plate 3 in front of ultraviolet light source 2, and long 80mm is arranged on the shading plate 3, wide 2mm light-transmitting gro...

Embodiment 2

[0023] The visualization system of this embodiment is composed of 1 camera, 2 light sources, 3 light-shielding plates, 8 light-transmitting slots, 4 condenser mirrors, 5 particle containers, the observed fluid, display particles, and an installation platform 7. The installation structure is shown in Figure 1 . The light source 2, the condenser lens 4 and the camera 1 can move on the platform 7 so as to obtain the best lighting and imaging effects. The display particles are mixed evenly with 92g206 polystyrene, 5g atomic ash, and 3g infrared absorber, heated at 220°C to fully fuse, and then granulated by a granulator after fusion, with a particle diameter of 1.0mm and a density of 1.08g / cm 3 . The fluid medium is water, and edible salt is added to adjust the density to 1.08g / cm 3 . The fluid is filled with particle containers 5 with a diameter of 120 mm and a height of 160 mm. Add shading plate 3 in front of infrared light source 2, and long 80mm is arranged on the shading ...

Embodiment 3

[0025] The visualization system of this embodiment is composed of 1 camera, 2 light sources, 3 light-shielding plates, 8 light-transmitting slots, 4 condenser mirrors, 5 particle containers, the observed fluid, display particles, and an installation platform 7. The installation structure is shown in Figure 1 . The light source 2, the condenser lens 4 and the camera 1 can move on the platform 7 so as to obtain the best lighting and imaging effects. The display particles are mixed evenly by 85g206 polystyrene, 7g atomic ash, and 5g infrared absorber, heated at 230°C to fully fuse, and then granulated by a granulator after fusion, with a particle diameter of 1.2mm and a density of 1.08g / cm 3 . The fluid medium is water, and edible salt is added to adjust the density to 1.08g / cm 3 . The fluid is filled with particle containers 5 with a diameter of 120 mm and a height of 160 mm. Add shading plate 3 in front of ultraviolet light source 2, and long 80mm is arranged on the shading...

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Abstract

The invention relates to a particle operation path imaging device and the visual method, belonging to observation and analysis technologies for liquid flow field. In the flow field visual device camera, light source, light shielding plate, condensing lens and vessel for particles are installed on the platform. The light source emits infrared or ultraviolet light and light beam is formed after lights passes through the light shielding plate and the condensing lens to irradiate the vessel for particles. Particles display their moving paths in liquid medium and by camera their moving paths are recorded. The invention is applied for imaging of particle, which can absorb black light. It can record particle moving path directly by common camera or digital camera and infrared or ultraviolet linear light source. High-speed CCD of PIV system, laser and analysis calculation software for particle correlation can be omitted so that system cost can be decreased greatly. The cost of invention is about 1 / 40-1 / 10 of cost of current common PIV.

Description

Technical field: [0001] The invention relates to fluid flow field observation and analysis technology, in particular to a particle running track imaging device and visualization method. Background technique: [0002] For many years, the visualization research of flow field has always been a topic of interest to people. With the development of optics, electronic imaging technology and computer technology, people began to use electronic imaging and computer technology to study and analyze the flow process of fluid, including flow field display, velocity and density distribution, etc. At present, a flow display analysis technique similar in function to the present invention and widely used is particle image velocimetry (Particle Image Velocimetry, referred to as PIV). The basic principle of the particle image velocimetry technology is to uniformly dope the tiny tracer particles similar to the fluid density in the flow field to be measured, so that the changes of the tracer par...

Claims

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Application Information

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IPC IPC(8): G01T5/00
Inventor 刘庆平任露泉崔占荣
Owner JILIN UNIV
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