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Low noise pneumatic jet nozzle

A pneumatic nozzle and low-noise technology, which is applied in the direction of injection devices, injection devices, jet propulsion devices, etc., can solve problems such as unsatisfactory effects, and achieve the effect of reducing airflow impact noise and airflow noise

Inactive Publication Date: 2009-01-14
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the existing methods mainly reduce the impact jet noise of the pneumatic nozzle by adding obstacles at the nozzle outlet or using coaxial jets, but the effect is not satisfactory.

Method used

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  • Low noise pneumatic jet nozzle
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Embodiment Construction

[0011] The specific structure and implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0012] figure 1 The main sectional view of the embodiment of the low-noise pneumatic nozzle provided by the present invention. The low-noise pneumatic nozzle provided by the present invention comprises a nozzle main body 1, which is provided with a main air passage 1, a tapered main air passage 7 and a spout 4 in sequence, and a boss with a cylindrical cavity 5 is provided at the front end of the spout 4 6. Arrange two or more microchannels 3 communicating with the cylindrical cavity along the circumference of the boss (such as figure 2 shown). The ratio of the diameter of the microchannel 3 to the diameter of the spout should generally be less than 10%, and the microchannel 3 is preferably symmetrically distributed along the circumferential direction, so that the airflow direction in the microchannel is perpendicular to ...

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Abstract

The low-noise aerodynamic nozzle comprises: a boss with a column cavity on front of the nozzle, and two or more micro-channels connected to the cavity around the boss. This invention changes flow field structure of nozzle jet to reduce large-scale eddy and the airflow noise, and destroys the sound feedback to reduce airflow impact noise.

Description

technical field [0001] The invention relates to a pneumatic nozzle, in particular to a jet propulsion device which can be used for blowing dust removal equipment in mechanical manufacturing and aircraft engines in the aviation field. Background technique [0002] Pneumatic nozzles are widely used in blowing dust removal equipment in machinery manufacturing and jet propulsion devices for aircraft engines in the aviation field. When the high-speed airflow ejected from the nozzle hits the solid surface, strong impact noise will be generated, so noise pollution is the biggest problem in the application of pneumatic nozzles. A large part of the impinging jet noise is single-frequency whistling, which is mainly due to the impact of the large-scale vortex structure in the nozzle jet shear layer on the solid surface, resulting in pseudo-ordered pressure fluctuations, resulting in the generation of upward sound waves , when the upward sound wave propagates to the edge of the nozzle ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05B1/00B08B3/02F02K1/00
Inventor 姚朝晖郝鹏飞何枫杨岱强侯修洲
Owner TSINGHUA UNIV
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