Double-pre-film type ultrasonic spray nozzle

Abstract

The invention discloses a double-pre-film type ultrasonic spray nozzle, specially an ultrasonic atomizing spray nozzle suitable for a combustor, which belongs to the field of industrial combustion. The double-pre-film type ultrasonic spray nozzle comprises a spray tube, a central rod, a resonant cavity, a flat gasket and a hexagonal nut, wherein the outlet section of the spray tube is equipped with a convergent spray tube; the inner part at the left end of the central rod is hollow; the right end of the central rod is equipped with a solid rod; the outer surface of the solid rod is tapped withthreads; and the resonant cavity, the flat gasket and the hexagonal nut are connected by the central rod. Double-pre-film type oil spray and convergent spray tube type design are adopted, so that thespray nozzle can realize secondary atomizing; fuel oil flow and air flow can be met according to the dimension of a to-be-regulated structure; and meanwhile, a distance from the resonant cavity to anoutlet of the spray tube can be regulated to obtain different spray angles. The double-pre-film type ultrasonic spray nozzle is simple in structure, is small in gas-liquid ratio, is good in atomizingeffect, is great in atomizing angle variable range, sufficiently utilizes structure characteristics, flow field characteristics and sound pressure characteristics of an ultrasonic generator, greatlyimproves atomizing quality of fuel oil from structure and principle, and improves combustion efficiency.

Description

technical field [0001] The invention relates to a double pre-membrane ultrasonic nozzle, which belongs to the technical field of fluid atomization. Background technique [0002] The combustion system is one of the most important components of aerospace propulsion devices. The combustion system using liquid fuel atomizes the fuel into uniform, fine droplet-like liquid mist through an atomizer, and then blends, evaporates, and finally burns And the high-temperature and high-pressure gas is discharged from the propulsion device to obtain thrust. Therefore, the atomizer is one of the key components to ensure stable combustion, high efficiency and low emissions. [0003] A specific form of atomizer, the nozzle is a key component in combustion devices using liquid fuels. Ultrasonic nozzles are a new type of nozzles developed based on ultrasonic generators in the 1980s. Due to the different methods of ultrasonic generation, ultrasonic nozzles are currently divided into two catego...

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Problems solved by technology

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a double pre-membrane ultrasonic nozzle, which makes full use of the structural characteristics, flow field characteristics and sound pressure characteristics of the ultrasonic generator, and overcomes the air pressure of ordinary fluid dynamic ultrasonic nozzles. The defect that the liquid ratio is too high and the atomization effect is not good enough, and the structure is simple and the atomization angle is adjustable

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