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Pressure field calculating method and device based on particle image velocimetry technology

A particle image velocimetry and calculation method technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as low efficiency, complexity, and difficulty in analyzing the velocity field

Active Publication Date: 2014-04-16
北京立方天地科技发展有限责任公司
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Problems solved by technology

In the process of its implementation, the velocity field needs to be measured first, but the velocity field obtained by the experimental measurement often has errors, and this error will be introduced in the process of solving the pressure gradient vector field from the time-resolved velocity field, and further affects Pressure field obtained by integrating the pressure gradient vector field
Due to the complexity of the pressure integration method, it is difficult to analyze how the error in the velocity field propagates and affects the final pressure field
It can be seen that the calculation accuracy of the existing flow field pressure field is not high
In addition, the multi-integration path pressure integration method needs to use a large number of integrations of different paths to eliminate random errors for the pressure of a certain point in the flow field, so the workload of pressure integration is large and the efficiency is low

Method used

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  • Pressure field calculating method and device based on particle image velocimetry technology
  • Pressure field calculating method and device based on particle image velocimetry technology
  • Pressure field calculating method and device based on particle image velocimetry technology

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Embodiment Construction

[0038] According to the N-S equation of three-dimensional incompressible fluid (as follows), the pressure is a potential function:

[0039] ▿ P = - ρ D U ‾ Dt + μ ▿ 2 U ‾ + f ‾

[0040] in, is the Hamiltonian, P is the pressure, ρ is the density of the fluid, is the velocity vector, μ is the dynamic viscosity coefficient, is the body force, is the pressure gradient, is the Laplacian operator, is a harmonic function of velocity.

[0041] Record the sum of the three terms on the right side of the N-S equation as a vector field which is then there is a vector field Satisfy the following no-rotation condition:

[0042] ▿ × ▿ P ...

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Abstract

The invention discloses a pressure field calculating method based on a particle image velocimetry (PIV) technology. The method comprises the steps of calculating the amendment vector field of an initial pressure gradient vector field after obtaining the initial pressure gradient vector field through calculation, calculating according to the initial pressure gradient vector field and the amendment vector field to obtain the amended pressure gradient vector field, and conducting integration on the amended pressure gradient vector field so as to obtain the pressure field. The invention further discloses a device for realizing the method so as to improve the calculating precision of the pressure field. Moreover, the method and the device can simplify the complexity of the pressure field integration calculation and improve pressure integration efficiency.

Description

technical field [0001] The present invention relates to particle image velocimetry (PIV for short) technology in the technical field of laser velocimetry, and in particular to a pressure field calculation method and device based on PIV technology. Background technique [0002] PIV technology is a modern laser velocity measurement technology, which is mainly used in flow field velocity measurement, and the flow field velocity field is obtained by tracking the movement of tracer particles in the flow field. PIV technology can realize two-dimensional or three-dimensional velocity field measurement through sheet light source or volume light source, and time-resolved PIV experimental measurement can also be realized through high-speed camera imaging, and the fluid dynamics control equation, that is, N-S equation reconstruction can be used to obtain the coupling with the velocity field Flow field pressure field. In the process of pressure field reconstruction, two technical links...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 高琪王中一王成跃王晋军
Owner 北京立方天地科技发展有限责任公司
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