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Design method of cavitation water jet nozzle structure

A technology of structural design and design method, which is applied in the field of metal surface strengthening and surface cleaning, can solve the problems of insufficient theoretical basis of structural design, insufficient optimization of nozzle structure, etc., and achieve the effect of improving cavitation efficiency and optimizing nozzle structure

Pending Publication Date: 2020-04-21
SUZHOU NUCLEAR POWER RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nozzle designers usually choose circles, ellipses, squares, cones, etc. as traditional cavitation nozzle cross-sections, and use trial and error methods for type selection and design. Although many achievements have been made in numerical simulation and experimental research, the structural design Insufficient theoretical basis, nozzle structure is still not optimized

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  • Design method of cavitation water jet nozzle structure
  • Design method of cavitation water jet nozzle structure
  • Design method of cavitation water jet nozzle structure

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as Figure 1 to Figure 4 As shown, according to Bernoulli's principle, for steady flow (in the flow system, the properties of the fluid at any point do not change with time), incompressible flow (density is constant), frictionless flow (friction effect can be ignored, and viscosity effect), the fluid flowing along the streamline satisfies the following relationship at any position:

[0038] p+0.5ρb 2 +ρgh=C

[0039] In the formula, p is the pressure of a certain point in the fluid, v is the velocity of the fluid at that point, ρ is the density of the fluid, g is the acceleration of gravity, h is the height of the point, and C is a constant. After deformation:

[0040] p=C-0.5ρv 2 -ρgh

[0041] Substituting the flow velocity v=q / S (q is the flow rate, S is the cross-sectional area) into the above formula:

[0042] ...

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Abstract

The invention relates to a design method of a cavitation water jet nozzle structure. The design method sequentially comprises the following steps: (1) calculating a proportional relation between the pressure of a certain point in a fluid and the diameter of the cross section of the fluid at the point according to a Bernoulli principle; (2) according to the proportional relation in the step (1), calculating the proportional relation between the pressure drop of the fluid in the cavitation water jet nozzle and the necking length; and (3) according to the proportional relation in the step (2), when the pressure of the fluid in the nozzle is continuously changed along with the movement distance, calculating the function relation between the inner diameter of the cross section of the nozzle andthe necking length. Starting from the Bernoulli principle of water flow, according to theoretical derivation calculation, the relation between the diameter and the length of the section of the inletand outlet of the nozzle is designed on the basis of quantitatively controlling the water pressure change of the inlet and outlet of the nozzle, and a design method and thought and a model selection theoretical basis and basis can be provided for nozzle designers. The foundation is laid for further optimizing the nozzle structure and improving the cavitation efficiency.

Description

technical field [0001] The invention relates to the field of metal surface strengthening and surface cleaning, in particular to a structural design method of a cavitation water jet nozzle. Background technique [0002] Cavitation water jet technology uses a large number of tiny cavitation groups generated by high-speed water jets. When the cavitation groups collapse near the solid boundary, they generate impact pressures and micro jets up to thousands of MPa. They can be used for cleaning, surface strengthening, etc., and are environmentally friendly. , energy saving, high efficiency, easy operation and so on. Nozzle designers usually choose circles, ellipses, squares, cones, etc. as traditional cavitation nozzle cross-sections, and use trial and error methods for type selection and design. Although many achievements have been made in numerical simulation and experimental research, the structural design The theoretical basis is insufficient, and the nozzle structure is stil...

Claims

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Application Information

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IPC IPC(8): G06F30/20
Inventor 韩姚磊薛飞彭群家梅金娜张国栋刘寅立王鹏蔡振
Owner SUZHOU NUCLEAR POWER RES INST
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