Automatic release device and release control method for tracer particles in non-constant flow

Abstract

The invention provides an automatic release device and release control method for tracer particles in a non-constant flow. The device comprises a tracer particle stirring device, a tracer particle transportation system and a release control system, the release control system comprises a height-adjustable measuring bridge, a wireless propeller type flow meter, a flow control instrument and computer equipment. The water level process in the water tank is tracked in real time through the height-adjustable measuring bridge, the position of the wireless propeller type flow meter on the measuring bridge is adjusted in real time, the position is fed back to the flow control instrument through a wireless transmission module connected with the computer, and the flow control instrument adjusts the power and starting duration of a water pump in real time according to flow speed information. After the tracer particles are uniformly mixed by the stirring device, the tracer particles are put into the water tank in a solution form. According to the invention, the average flow velocity of the section can be accurately and rapidly measured, and the source density of the tracer particles during release is adjusted in real time according to the flow velocity, so that the concentration of the tracer particles in the water tank is constant.

Description

technical field [0001] The invention belongs to the fields of fluid mechanics and river dynamics, and improves the method for launching tracer particles when particle image velocimetry (PIV) is carried out in large open channels, and in particular relates to an automatic launching device for tracer particles in non-constant flow and a launching control method. Background technique [0002] Particle Image Velocimetry (PIV for short) is usually used to measure the flow field. When using PIV to measure the two-dimensional flow field, it is necessary to put tracer particles in the liquid to be measured, and illuminate the liquid to be measured with a laser light source. area, analyze the displacement of each tracer particle in two adjacent frames at the same position in the area to be measured, and calculate the velocity vector of the point where the tracer particle is located (the principle of partition measurement is as follows: Figure 9 ), so as to finally obtain the entire ...

AI Technical Summary

Problems solved by technology

Manual delivery is to configure the mixed solution of tracer particles in a small container and then pour the solution into the fluid to be tested. First, this method cannot ensure that the tracer particles are mixed evenly in the solution. Secondly, the workload is large when the fluid to be tested is large. Large, expensive and difficult to ensure a certain concentration and uniformity, especially in non-circulating large open channel tanks

[0005] The method of pumping the tracer particle solution is to pump the solution through the rubber tube to the fluid to be tested. This method cannot ensure that the tracer particles are evenly mixed in the fluid. When the flow rate changes, the amount of tracer particles cannot be adjusted in real time.

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