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Self-oscillation jet flow generation device

A technology of self-excited oscillating jet and generating device, which is applied in the direction of injection device, injection device, etc., can solve the problems of complex structure, increased weight and maintenance cost, and achieve the effect of large oscillation amplitude

Inactive Publication Date: 2015-04-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the method of making the jet oscillate was to add a reciprocating mechanism to forcibly disturb the jet, and the reciprocating mechanism is often complicated in structure, which will add a lot of extra weight and maintenance costs

Method used

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  • Self-oscillation jet flow generation device
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  • Self-oscillation jet flow generation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An example of a self-excited oscillating jet generator figure 2 As shown, it is mainly composed of inlet section 1, oscillation cavity 2, feedback loop 3, feedback loop 4 and nozzle 5. The working medium is liquid. The inlet section 1 is constricted and can accelerate the liquid. The end of the inlet section 1 is connected to the inlet 21 of the oscillation chamber 2 . The oscillation cavity is a cuboid square cavity with an upper surface 23 and a lower surface 24 . The outlet 22 of the oscillation chamber is connected to the nozzle 5 . Two upper and lower feedback loops 3 and 4 are arranged between the oscillating chamber outlet 22 and the oscillating chamber inlet 21 .

[0020] When the device is in operation, after the atomized liquid flows in, it is accelerated through the inlet section 1 to form a main jet that is sprayed into the oscillation chamber 2 from the entrance 21 of the oscillation chamber. According to the Coanda effect, the jet has a tendency to d...

Embodiment 2

[0022] An embodiment of a self-oscillating double-strand intermittent jet generator is as image 3 As shown, the main difference between the second embodiment and the first embodiment is that a wedge-shaped object 6 is arranged at the spout 5 . When the device is in operation, the fluid flows in and is accelerated through the inlet section 1 to form a main jet which is sprayed into the oscillation chamber 2 from the entrance 21 of the oscillation chamber. Assuming that the jet is deflected to the upper surface 23 under the action of random factors, when it reaches the outlet 22 of the oscillation cavity, the main jet is ejected from above the wedge-shaped object 6 to form a main jet with a phase of 0°. At the same time, a small portion of liquid flows from the feedback loop 3 to the inlet 21 of the oscillation chamber. This small portion of liquid interacts with the main jet at the inlet 21 of the oscillating chamber so that the main jet is deflected towards the lower surface...

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PUM

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Abstract

The invention relates to a self-oscillation jet flow generation device. The self-oscillation jet flow generation device comprises an inlet section, an oscillation cavity, feedback loops and a spray opening; the inlet section is arranged on the left end of the device, the oscillation cavity is formed in the middle part of the device, the spray opening is arranged on the right end of the device, and the inlet section, the oscillation cavity and the spray opening are sequentially connected with one another; the inlet section is connected with the oscillation cavity, the oscillation cavity is connected with the spray opening, and an outlet of the oscillation cavity is connected to an inlet of the oscillation cavity by virtue of a plurality of feedback loops. By adopting the self-oscillation jet flow generation device, the self-oscillation jet flow can be generated both for the liquid and gas medium; moreover, no movable part is needed, the use is convenient, the structure is simple and compact, and the self-oscillation jet flow generation device is used for fields such as liquid atomizing, enhanced heat exchanging, flow control, washing, cutting, crushing tools and the like.

Description

technical field [0001] The invention relates to a self-excited oscillating jet flow generating device, which utilizes the Coanda effect and fluid logic feedback to make the fluid generate periodic oscillation and eject it through a nozzle to generate a self-excited oscillating jet. This device is mainly used in the field of liquid oscillating atomization and heat exchange enhancement, and can also be used in flow control, cleaning, cutting, breaking tools and other fields. Background technique [0002] Oscillating jets have important applications in liquid atomization, enhanced heat transfer, cleaning, cutting and other fields. When the jet is ejected from the nozzle, the self-excited oscillation will accelerate the stabilization of the jet, thereby promoting the breakage and atomization of the jet. For enhanced heat transfer, the oscillating jet will destroy the boundary layer, increase the convective heat transfer coefficient, and enhance the heat transfer. In the field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05B1/26B05B1/34
CPCB05B1/26B05B1/34
Inventor 富庆飞崔坤达杜明龙段润泽杨立军
Owner BEIHANG UNIV