Method and device for on-line measurement of liquid spraying through full-field rainbow

Abstract

The invention relates to a spraying liquid drop parameter measurement technique, and aims at providing a method and a device for on-line measurement of liquid spraying through a full-field rainbow. The method comprises the steps that the light intensity of a rainbow signal is recorded; a rainbow coefficient matrix is calculated; the particle size and a refractive index are calculated; the full-field rainbow is calculated; data is saved; a result is optimized and repeated; particle size distribution and the refractive index of spraying are obtained finally; and concentration, temperature and a component of a liquid drop are obtained by combining a relation between the refractive index and solution concentration and a relation between the temperature and the component. The device comprises a spraying system realizing the full-field rainbow, a first lens, a second lens, a small-pore diaphragm, a CCD (Charge Coupled Device) camera provided with a zoom lens, and a port externally connected with a computer processing system. The method and the device have the benefits that simultaneous measurement of multiple parameters such as the refractive index, the particle size, the concentration, the temperature and the component of the spraying liquid drop is realized; compact design is performed on the system; the device is portable and high in field operation; and an industrial application of on-line and real-time measurement of a rainbow technique is facilitated.

Description

technical field [0001] The invention relates to a spray droplet parameter measurement technology, in particular to a method and device for online measurement of liquid spray refractive index, particle size and concentration, temperature and components by using full-field rainbow technology. Background technique [0002] Spray gas-liquid two-phase flow is widely used in industrial processes, such as spray combustion, spray mixing, spray absorption and removal of pollutants, etc. The atomization characteristics of spray directly affect the combustion, absorption or mixing efficiency, and pollutant emission levels. The detection of key parameters such as droplet size distribution, velocity, composition, concentration, and temperature in the spray flow field has important scientific significance and industrial applications for in-depth study of the spray flow field and optimization of the spray system. Therefore, it is necessary to develop methods and devices for online measurem...

AI Technical Summary

Problems solved by technology

Laser-induced fluorescence can analyze the droplet concentration by adding fluorescent substances to the droplets and measuring the fluorescence excited by the laser with a CCD. It has high time and spectral resolution, but the addition of fluorescent agents will change the physical and chemical properties of the droplets. impact spray fields

In addition, the laser-induced fluorescence method is easily affected by factors such as temperature, pressure, concentration, and fluorescent agent molecules. Therefore, this method has many difficulties and low accuracy in practical applications.

[0004] Therefore, none of the above measurement techniques can simultaneously and accurately obtain key parameters such as the refractive index, particle size and concentration, temperature and composition of the spray droplets.

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