Particle generator

Abstract

The invention provides a particle generator, and the particle generator comprises a particle tank which is provided with a particle feed port and is used for accommodating tracer particles; a particle conveying cavity which is arranged at the bottom of the particle tank in a protruding mode and communicates with the interior of the particle tank, wherein the cross section of an inner cavity of the particle conveying cavity is smaller than that of the inner cavity of the particle tank; a to-be-detected gas inlet pipe which is communicated with the particle conveying cavity and is used for introducing to-be-detected gas into the particle conveying cavity; a to-be-tested gas outlet pipe which is communicated with the particle conveying cavity and is used for discharging a mixture of the to-be-tested gas and the tracer particles to the test flow field; and a conveying screw rod which is used for uniformly conveying the tracer particles in the particle tank to the particle conveying cavity. The particles in the particle tank are more uniformly, vertically and downwards conveyed to the particle conveying cavity located at the bottom of the particle tank through the conveying screw rod, and the particle flow is kept stable in the particle conveying process, so that the number of tracer particles entering a flow field can be more accurately controlled.

Description

technical field [0001] The invention relates to the technical field of particle image velocimetry, in particular to a particle generator. Background technique [0002] Particle image velocimetry technology is a non-contact optical velocimetry technology, which has the advantages of wide measurement range, less interference to the flow field, and the ability to measure transient velocities. It has been widely used in the research of various fluid phenomena. The PIV solid particle generator is a device for generating tracer particles. According to the measurement requirements, a certain amount of solid particles are generated to follow the airflow into the flow field and move with the flow field. The structural characteristics of the PIV solid particle generator directly affect the quality of the particles generated, thereby affecting the final velocity measurement effect. [0003] Existing particle generators mainly use gas excitation. Generally, a metal tube is inserted int...

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Problems solved by technology

[0004] Usually, this method can carry a sufficient number of tracer particles into the flow field to be measured under the condition of large flow (or high pressure), but under the condition of small flow rate, the number of tracer particles does not meet the measurement conditions due to the small impact force of the gas.

Moreover, this method cannot accurately control the number of particles entering the flow field, so there is instability, generally more at the beginning, as the experiment progresses, the number of particles gradually decreases, which cannot meet the requirements of the entire experimental process

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