Device and method for preparing spherical cavitation bubble

A cavitation, spherical technology

Active Publication Date: 2015-09-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the laser adjustment system commonly used for cavitation adopts the beam expansion focusing system, which has a simple structure, but most of the output beams are elliptical and ribbon beams, which are difficult to adjust to a standard spherical shape.

Method used

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  • Device and method for preparing spherical cavitation bubble
  • Device and method for preparing spherical cavitation bubble
  • Device and method for preparing spherical cavitation bubble

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The device for preparing spherical cavities according to the present invention:

[0038] like figure 1 As shown, the pulsed laser 1 emits a pulsed laser beam with a Gaussian beam shape, which provides excitation energy for the generation of spherical cavitation. The laser spot is circular and the pulse width is less than 100 ns. The output power density J of the laser is much larger than that of the liquid medium laser Breakdown Threshold Power Density J 0 ; The adjustable beam expander system 2 receives the pulsed laser emitted by the pulsed laser, amplifies the spot of the laser, and controls the magnification by the adjustable beam expander control system 7, and the magnification β of the adjustable beam expander system is determined by the device on the optical path Determined by the minimum aperture diameter D, value range Where d is the output laser spot diameter of the pulse laser; the amplified laser is converted into linearly polarized light through a linear...

Embodiment 1

[0058] 1) The liquid medium is tap water.

[0059] 2) The pulsed laser 1 is SpitLight1000 pulsed Nd:YAG laser, which outputs 1064nm infrared pulsed Gaussian laser beam, the laser pulse width is 10ns, the repetition frequency is 10Hz, the divergence angle is ≤0.7mrad, and the single pulse laser outputs a stable energy of 250mJ (according to the tap water Laser breakdown threshold 0.5×10 11 W / cm 2 And device loss, and leave the experimental measurement of the degree of redundancy). The output spot diameter is 5mm.

[0060] 3) The adjustable beam expander system adopts YAG laser high-performance beam expander, the model is EPZ-37C of GEOMATEC, first set the magnification of the beam expander system to 4 times. The diameter after beam expansion is 20 mm.

[0061] 4) The attenuation amplitude τ of the adjustable attenuator 0 Set to 10%.

[0062] 5) The focal length of the short focus system is 150mm.

[0063] 6) The distance between the aperture and the short focus system is...

Embodiment 2

[0072] 1) The liquid medium is silica gel, the single-pulse laser output stable energy is 800mJ, the adjustable beam expansion system is 4 times, and the rest of the operations are repeated from steps 1) to 9) of Example 1.

[0073] 2) Calculate the length L of the cavity in the x direction x = 1.56mm and the length L in the y direction y =8.52mm.

[0074] 3) because and Adjust the output energy of the laser to 135mJ.

[0075] 4) Collect the laser-induced cavitation image again.

[0076] 5) The length L of the cavity in the x direction at this time x = 1.16mm and the length L in the y direction y = 1.12 mm. therefore , laser-induced spherical cavitation was obtained.

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Abstract

The invention provides a device and a method for preparing a spherical cavitation bubble, and belongs to the technical field of laser. A light path setting is fine adjusted according to judgment feedback of collected images, action parameters of laser and a liquid medium are controlled, and the output of a laser spherical cavitation bubble is realized. Therefore, the device and the method for preparing the spherical cavitation bubble have the advantages that the controllability is high, the operation is simple and the like.

Description

technical field [0001] The invention belongs to the field of laser technology, in particular to a device and method for preparing spherical voids. Background technique [0002] Cavitation erosion is a unique phenomenon in liquid medium. It can be harmful, or it can be transformed into a processing tool to serve human production and life. Cavitation is the process of the formation, development, pulsation and collapse of gas bubbles inside the liquid. Cavitation is the process in which the micro-shock wave and micro-jet formed by the pulsation of the cavitation attack the surface of the material to form damage. High-speed water flow is prone to cavitation erosion, and cavitation erosion damage caused by a 100-meter-high dam will seriously affect the normal operation of the system, and even cause major catastrophic accidents. Underwater facilities such as water conservancy machinery and underwater submarines are inevitably plagued by cavitation problems during their operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/55B23K26/03B23K26/0622B23K26/073B23K26/046B23K26/064
CPCB23K26/032B23K26/046B23K26/073B23K26/55
Inventor 佟艳群任旭东袁寿其石琳随赛卢加兴何浩王杰
Owner JIANGSU UNIV
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