Device and method for measuring grain flow velocity field

Abstract

The invention relates to a device and method for measuring the grain flow velocity field, and the device comprises a horizontal rotating table, a roller, a light source part, an image collection part, and a computer. The method comprises the following steps: 1, collecting an image of a grain flow on the surface of a fluidized bed; 2, segmenting the image into a plurality of measurement subregions; 3, carrying out the spatial filtering, carrying out the traversal of all measurement subregions, and obtaining a spatial filtering original signal; 4, carrying out the spectrum analysis of the original signal, obtaining the signal spectrum, correcting the signal spectrum, obtaining the central frequency of the signal, and obtaining the speed of the measurement subregions through calculation; 5, repeatedly carrying out the steps 2, 3, 4 for all sample points, obtaining the speed of the whole measurement region, and achieving the measurement of the velocity field of the grain flow. The device is simple in debugging, does not need a complex optical lens and a complex transmission grating, and solves a problem that the conventional spatial filtering cannot solve a problem of the measurement of the velocity field.

Description

technical field [0001] The invention belongs to the technical field of velocity measurement, and in particular relates to a device and method for measuring particle flow velocity field. Background technique [0002] Dense particle flow is a state of the existence of particulate matter, which is ubiquitous in nature and industrial production, and is closely related to human production and life. Avalanches, landslides, and debris flows in natural phenomena and disasters, as well as granary collapses, mine landslides, and foundation collapses in industrial engineering, are all phenomena of particle flow. Therefore, measuring and studying the mechanism and law of dense particle flow has extremely important practical significance for reducing or even preventing the loss of life and property caused by it. [0003] Velocity measurement of dense particle flow is an important direction to study the mechanism of particle flow, but the commonly used measurement methods such as particl...

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Problems solved by technology

[0003] Velocity measurement of dense particle flow is an important direction to study the mechanism of particle flow, but the commonly used measurement methods such as particle image velocimetry (PIV) can only measure spherical particles with large particle diameters, and are not suitable for small or irregular particles. Particle flow; laser Doppler velocimetry (LDV) method can only measure the velocity of tracer particles in two-phase flow, not suitable for the measurement of dense particle flow

In addition, some other methods such as: positron emission particle tracking (PEPT), magnetic resonance imaging (MRI), X-ray tomography (CT), laser speckle velocimetry (LSV), etc., because there are no commercial instruments, they are not available. universality

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