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A kind of anti-cavitation microstructure surface layer

A technology of surface layer and microstructure, applied in mechanical equipment, fluid flow and other directions, can solve the problems of reduced efficiency and failure of turbine machinery, and achieve the effect of good anti-cavitation effect, convenient processing and reduction of cavitation damage.

Active Publication Date: 2019-11-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cavitation damage of key components will reduce the efficiency of turbomachinery or even fail

Method used

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  • A kind of anti-cavitation microstructure surface layer
  • A kind of anti-cavitation microstructure surface layer
  • A kind of anti-cavitation microstructure surface layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 and image 3 As shown, the surface layer includes a base and microprotrusions disposed on the surface of the base. The base 1 is a propeller, and columnar micro-protrusions are arranged on the surface of the lowest pressure part of the propeller, which is away from the direction of the incoming flow.

[0032] During the implementation, the water flow is impacted and passed through the valve core. After testing, it is found that:

[0033] In the absence of microprotrusions, the cavitation bubble collapsing jet forms cavitation erosion towards the propeller surface.

[0034] When micro-protrusions exist, the cavitation bubble-collapsing jet deviates from the elastic surface of the propeller, avoiding cavitation erosion.

Embodiment 2

[0036] Such as figure 2 and Figure 4 As shown, the surface layer includes a substrate and microgrooves disposed on the surface of the substrate. The base 1 is a valve core, and an inverted triangular micro-groove is provided on the surface of the valve core where the pressure is the lowest.

[0037] During the implementation, the water flow is impacted and passed through the valve core. After testing, it is found that:

[0038] When the microgroove does not exist, the cavitation bubble collapse jet flows towards the surface of the valve core to form cavitation erosion.

[0039] When micro-grooves exist, the cavitation bubble collapse jet deviates from the elastic surface of the valve core to avoid cavitation erosion.

[0040] From this implementation, it can be seen that the present invention greatly reduces the velocity of the micro-jet when the cavitation bubble collapses, and even changes the direction of the micro-jet away from the surface of the structure, thereby ef...

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Abstract

The invention discloses a cavitation-erosion-resistant microstructure surface layer. The cavitation-erosion-resistant microstructure surface layer comprises a base and a micro-protrusion or micro-groove microstructure which is arranged on the surface of the base and used for resisting cavitation erosion; an air film is formed by air contained in micro grooves formed between micro protrusions or air contained in the micro grooves, so that an air film layer which is used for resisting cavitation erosion is formed between a solid interface and a liquid interface through the microstructure; and the micro protrusions or the micro grooves serve as protecting layers and are arranged on the easy-cavitation surface of the base. According to the cavitation-erosion-resistant microstructure surface layer, the micro-jet speed during collapse of cavitation bubbles is greatly reduced, or even the micro-jet direction is changed to be away from the structure surface, so that damage to the surfaces of materials by cavitation and cavitation erosion is effectively inhibited.

Description

technical field [0001] The invention relates to the industrial fields of water conservancy, hydraulic pressure, chemical industry, etc., and in particular relates to a microstructure surface layer for suppressing cavitation and reducing cavitation damage, as a protective layer for important components. Background technique [0002] Fluid machinery such as hydraulic pumps, valves, and water conservancy machinery, with the application of modern high-speed, high-pressure, and large-flow requirements, cavitation occurs. Cavitation refers to the process that when the partial pressure of the fluid is lower than the vaporization pressure of the liquid, steam or gas is formed inside the liquid to form vapor bubbles, that is, cavitation bubbles. When the cavitation bubble flows from the low-pressure area to the high-pressure area, the volume shrinks and collapses under the action of the high pressure of the surrounding liquid, followed by pressure shock waves, high-speed micro jets, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15D1/00
Inventor 邹俊李博吉晨杨华勇
Owner ZHEJIANG UNIV
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