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Calculation method and device of compressible fluid pressure field based on PIV (Particle Image Velocimetry) technique

A technology of compressing fluids and calculation methods, which is applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as limiting practical applications, and achieve the effect of overcoming limitations and expanding the scope of application

Active Publication Date: 2017-08-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] At present, the pressure field calculation methods and devices based on PIV technology mainly focus on the range of incompressible fluids, which greatly limits the practical application of this method

Method used

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  • Calculation method and device of compressible fluid pressure field based on PIV (Particle Image Velocimetry) technique
  • Calculation method and device of compressible fluid pressure field based on PIV (Particle Image Velocimetry) technique
  • Calculation method and device of compressible fluid pressure field based on PIV (Particle Image Velocimetry) technique

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Embodiment Construction

[0063] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] figure 1 It is a schematic flow diagram of the implementation of the compressible fluid pressure field calculation method based on PIV technology described in the embodiment of the present invention, such as figure 1 shown, including:

[0065] Step 101: Select the gas state equation, heat state equation, momentum equation and energy equation in the N-S equation group as the basic equation group for calculating the compressible fluid pressure field, rearrange them according to the requirements of the prediction-correction technology and perform finite difference processing ;

[0066] Such as figure 2 As shown, the steps include:

[0067] Step 1011: selecting the gas equation of state and the heat equation of state, so that the basic equations are closed;

[0068] Step 1012: selecting the momentum equation in the mainstream...

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Abstract

The invention discloses a calculation method of a compressible fluid pressure field based on a PIV (Particle Image Velocimetry) technique. The method comprises the steps of selecting a gas state equation, a heat state equation, and a momentum equation and an energy equation in a hydromechanical governing equation set, namely an N-S equation set as a fundamental equation set for calculating the compressible fluid pressure field, performing rearrangement and finite difference processing on the fundamental equation set according to a requirement of a prediction-correction technique, setting an appropriate boundary condition according to a concrete form of a fluid field, and performing time stepping solution on the fundamental equation set by the prediction-correction technique to obtain the pressure field corresponding to a PIV velocity field. The invention further discloses a device for realizing the method. Therefore, a pressure field measurement scheme based on the PIV technique is provided for a compressible fluid; calculation limitation of the existing incompressible fluid pressure field is overcome; and an application scope of a fluid field pressure measurement scheme based on the PIV technique is greatly extended.

Description

technical field [0001] The present invention relates to particle image velocimetry (PIV for short) technology in the field of laser velocimetry technology, in particular, to a method and device for calculating compressible fluid pressure field based on particle image velocimetry technology. Background technique [0002] In the field of modern fluid mechanics, PIV plays a very important role as a quantitative measurement technique with high reliability, various uses and wide measurement range. PIV belongs to the indirect flow field velocimetry technology. By uniformly spreading markers such as particles or bubbles in the flow field, using a camera to record the trajectory of the markers, and then processing the image through the principle of autocorrelation or cross-correlation, you can obtain Velocity information of the flow field. [0003] According to the velocity field data measured by PIV, the flow field pressure field corresponding to the PIV velocity field can be obta...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F2111/10G06F2119/06
Inventor 刘顺徐惊雷俞凯凯
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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