Particle sedimentation flow field measurement control device and use method thereof

Abstract

The invention provides a particle sedimentation flow field measurement control device and a use method thereof. The device comprises a particle sedimentation control system, a particle motion tracking system and a PIV flow field measurement system. The particle settling control system comprises a settling vat, and a particle releasing frame and a power-losing type electromagnet are mounted at the upper part of the settling vat; the particle motion tracking system mainly comprises an electric slide rail, a programmable console and an L-shaped load plate mounted on the slide rail, and the L-shaped load plate can controllably move on the electric slide rail; the PIV flow field measurement system mainly comprises a laser device and a high-speed camera, and the laser device obtains the movement condition of tracer particles by illuminating a surface to be measured. The device is applied to multi-particle sedimentation experiment research, can ensure that initial motion states of particles are consistent, can greatly reduce errors caused by a large ratio of particle sedimentation velocity to surrounding fluid flow velocity and flow field splicing, and can finally complete capture of a surrounding fine flow field in a particle motion process.

Description

technical field [0001] The present application relates to the technical field of fluid mechanics and flow visualization, and in particular to a particle settling flow field measurement and control device and its application method. Background technique [0002] The experimental study of particle sedimentation is very strict on the control of the initial conditions. The control accuracy of initial conditions such as multi-particle release time, particle initial velocity, and particle initial motion state directly determines the success or failure of the experiment. The current methods for controlling the initial conditions of particle settling are: (1) Use an inclined plate and a vertical baffle to release particles, pull the vertical baffle upward, and the particles move along the inclined plate under the action of gravity, and are finally released at the bottom of the inclined plate ; (2) Use two plates with slots to release multi-particles, drag the lower plate horizontal...

AI Technical Summary

Problems solved by technology

The position of the high-speed camera is far away, the particles are small, the imaging resolution is low, and the accuracy of the experimental data is low; the high-speed camera is placed close, the velocity of the particles and the fluid within a particle size range is very different from the velocity of the peripheral fluid, and the dynamic range of the flow velocity is large , coupled with the small field of view of the camera, data stitching is required, and the accuracy of the obtained flow velocity data is still low

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