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Turbulent boundary layer flow field velocity measurement method based on boundary tracing

A boundary laminar flow and turbulent flow technology, which is applied in fluid velocity measurement, measurement devices, velocity/acceleration/impact measurement, etc., can solve problems such as inability to deal with flow fields, achieve a wide range of applications, improve efficiency, and improve accuracy.

Active Publication Date: 2018-02-16
HARBIN ENG UNIV
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Problems solved by technology

Using the average flow velocity as the basis for parameter selection will cause errors in the detection process of the detection area that is locally much larger than the average velocity, so this method cannot deal with the flow field in the boundary layer

Method used

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  • Turbulent boundary layer flow field velocity measurement method based on boundary tracing
  • Turbulent boundary layer flow field velocity measurement method based on boundary tracing
  • Turbulent boundary layer flow field velocity measurement method based on boundary tracing

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Embodiment 1

[0064] The image in the double burst process is obtained through experiments, such as Figure 13 shown. And select two images with a very close time interval in the burst process, such as Figure 14 (a) and Figure 14 (b) shown. Process the selected image with an image enhancement program to enhance the image features of hydrogen bubbles, such as Figure 15 (a) and Figure 15 (b) shown. Afterwards, the two images are preprocessed, which includes mean filtering and Gaussian filtering, and then processed by this patent method, and the velocity vector distribution map can be obtained through postprocessing, such as Figure 16 shown. then to Figure 16 By performing velocity extraction, velocity distribution diagrams at different positions can be obtained, such as Figure 17 (a), Figure 17 (b), Figure 17 (c), Figure 17 (d) and Figure 17 (e) shown. The three-burst process is carried out to detect the process, and the velocity distribution at different positions of ...

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Abstract

The invention provides a turbulent boundary layer flow field velocity measurement method based on boundary tracing and belongs to the field of fluid computing. The method is used for acquiring velocity vector distribution of turbulent boundary layer fluid with hydrogen bubbles being tracing particles under a single-phase condition. The method comprises the steps that a hydrogen bubble image is acquired through a special experimental facility, the obtained experimental image is subjected to image input processing, processing through a histogram equalization algorithm, image feature extraction processing, FCM cluster partitioning processing, boundary recognition and tracking processing, local velocity distribution processing, velocity maximum value extraction processing, setting of an optimal detection window of a fast Fourier transformation cross-correlation algorithm, processing through the fast Fourier transformation cross-correlation algorithm, velocity vector distribution processingand other processing processes in sequence, and finally the velocity vector distribution is obtained. The method is simple, easy to implement, high in application value, high in operability and convenient to realize; and quantitative analysis is performed on a large-scale structure existing in a turbulent boundary layer, and the blank of quantitative research about a turbulent boundary layer quasi-order structure with the hydrogen bubbles being the tracing particles is filled up.

Description

technical field [0001] The method provided by the invention relates to the quantitative analysis of the quasi-order structure of the turbulent boundary layer and belongs to the field of fluid calculation. Background technique [0002] There is a large-scale quasi-ordered structure in the turbulent boundary layer. This structure dominates the fluid momentum and energy transfer in the turbulent flow, and plays an important role in leading the generation of turbulent kinetic energy and maintaining turbulent flow. The research on the quasi-ordered structure in the turbulent boundary layer has become an energy source. hot issues in the industry. Due to the strong followability and good visualization effect of hydrogen bubbles, many related scholars use hydrogen bubbles to conduct visualization experiments on the quasi-ordered structure in the turbulent boundary layer. However, there is no relevant research on how to obtain the velocity field of the fluid in the turbulent boundar...

Claims

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Application Information

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IPC IPC(8): G06T7/215G06T7/246G06T7/262G01P5/00
CPCG01P5/00G06T2207/10016G06T2207/20024G06T2207/20056G06T7/215G06T7/248G06T7/262
Inventor 范广铭孙建闯李文超孙中宁郭恒辰丁铭
Owner HARBIN ENG UNIV
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