Tracer particle dispensing device and dispensing method for small-size PIV flow field testing experiment

Abstract

The invention discloses a tracer particle dispensing device and dispensing method for small-size PIV flow field testing experiment and belongs to the technical field of laser particle measurement. The tracer particle dispensing device comprises a liquid storage tank, an air supply source, a surge tank, a pressurized air source and a view cup, the liquid storage tank is sealed by an upper cover board, the pressurized air supply is connected with the liquid storage tank, an inside duct which enters the bottom liquid of the liquid storage tank is connected with the upper cover board, the upper cover board is connected with a swirl nozzle in the view cup through an outside duct, and the surge tank is connected with a pneumatic joint arranged on a flange and connected with the view cup through a branch air inlet pipe. The tracer particle dispensing device is capable of continuously and stably producing tracer particles, the grain diameter is adjustable, the particle quality is high, and the flow field situation can be well reflected; the tracer particle dispensing device is simple in structure, convenient to use, low in raw material cost, and easy to popularize.

Description

technical field [0001] The invention relates to a tracer particle distributing device and a dispensing method in a small-sized PIV flow field test experiment. The spray particles produced by it can provide effective tracer particles for particle image velocimetry (PIV), and are especially suitable for inlet pressure Air flow measurement with taller, smaller air inlet sizes and limited measuring volume dimensions. The invention belongs to the technical field of laser particle measurement. Background technique [0002] In order to explore the internal flow field of construction machinery such as internal combustion engines, PIV laser testing technology is widely used in the flow field test because of its advantages of being able to measure the entire field. In PIV experiments, the choice of tracer particles plays a crucial role in the results of the experiment. Tracer particles must strictly have the ability to scatter light and have good followability, safety, and economy....

AI Technical Summary

Problems solved by technology

[0003] Most of the tracer particles produced by the tracer particle generators used in PIV experiments can only be used to measure the gas flow at or below atmospheric pressure. In the flow field with high gas pressure, the tracer particles will agglomerate, and even cause serious wall collision, and cannot enter the high-pressure gas and mix with the gas.

The tracer particle generator for supersonic flow measurement needs to be vacuumed to inhale the tracer particle powder. These particle powders are mostly solid tracer particles, such as titanium dioxide, aluminum oxide, etc., which are relatively expensive and the experimental equipment is relatively expensive. complex

And when the space in the measurement area is small, the solid powder is easy to cover the viewfinder window for light entry and photography, which is not conducive to light entry and image collection

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