PIV solid particle generator

Abstract

The invention relates to a PIV solid particle generator comprising a tank-shaped upper cover, a middle module and a tank-shaped base; the lower end of the tank-shaped upper cover is open, and a firstcavity is formed in the tank-shaped upper cover; the upper end of the tank-shaped base is open, and a third cavity is formed in the tank-shaped base; the middle module comprises a motor, a motor bracket, a transmission cover, a transmission shaft, a stirrer and a feeding pipe; the transmission cover comprises a convex disc and an annular side plate; the annular side plate is connected with the edge of the convex disc, and the annular side plate and the top surface of the convex disc jointly form a second cavity; the annular side plate is movably and hermetically connected with the tank-shapedupper cover, so that the first cavity is communicated with the second cavity; the tank-shaped base is movably and hermetically connected with the convex disc, so that the stirrer is positioned at thebottom of the third cavity. Compared with the prior art, the whole sealing performance is improved by redesigning the structure of the particle generator, and the particle generator is suitable for small-flow particle stirring application conditions; the experiment requirement is reduced; the safety of use is improved.

Description

technical field [0001] The invention relates to the technical field of particle tracer laser measurement, in particular to a PIV solid-state particle generator. Background technique [0002] Particle Image Velocimetry (PIV) is a non-contact velocity field measurement technology. Compared with intrusive measurement methods such as hot wire anemometer, PIV not only has the advantages of high precision and high resolution of single point measurement technology, but also It is possible to obtain transient images and overall structures displayed by planar flow fields. In the field of two-dimensional full-field velocimetry, PIV is a mature technology and has rapidly developed into a standard method for flow field measurement. [0003] For example, the Chinese utility model whose publication number is CN208984664U discloses a PIV solid-state tracer particle generator, which is used to stir particles to generate a uniform and stable particle flow; There are the following problems:...

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Problems solved by technology

[0003] For example, the Chinese utility model whose publication number is CN208984664U discloses a PIV solid-state tracer particle generator, which is used to stir particles to generate a uniform and stable particle flow; There are the following problems: 1. There must be a sealing problem at the connection between the motor shaft and the particle stirring chamber. The reason is that the diameter of the particles used by PIV is about 1 micron. Leakage in the gap of the motor shaft, inhaled into the lungs by the human body, causing physical damage

2. It is necessary to use a high-pressure air source and cooperate with multiple annular air inlet nozzles, which has high requirements on the air source, which increases the difficulty and cost of the experiment, and the pressure difference between the inside and outside of the device formed by the high-pressure air source is more likely to cause particles in the gap of the shaft leak of

3. The motor shaft is set at the lower end of the agitator, which is easy to cause particles to accumulate and harden in the gap of the shaft under the action of gravity, which will aggravate the wear of the shaft and affect the service life

4. The pressure requirement for incoming air flow is relatively high, and the power of mixing mainly comes from the air flow, which is only suitable for experimental conditions with large flow rates, not suitable for experimental conditions with small flow rates

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