Method for identifying the location of the gas-liquid interface
A gas-liquid interface and interface technology, which is applied to liquid level indicators, liquid level indicators for physical variable measurement, and measuring devices, can solve problems such as poor accuracy of measurement results, inaccurate identification of interface positions, and inapplicability. To achieve the effect of high recognition accuracy
Active Publication Date: 2020-12-08
PEKING UNIV
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[0004] The invention provides a method for identifying the position of the gas-liquid interface to solve the problem that the existing particle image velocimetry method can only identify the position of the gas-liquid interface when there are tracer particles on one side of the interface when performing near-wall measurement, which cannot be applied to There are particles on both sides of the interface, and the identification of the interface position is not accurate, and the technical problem of poor measurement accuracy
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[0067] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered below.
[0068] Such as figure 1 As shown, the preferred embodiment of the present invention provides a method for identifying the position of the gas-liquid interface, which can identify the position of the gas-liquid interface in the process of measuring the velocity field on both sides of the gas-liquid interface, and can be adapted to tracers on both sides of the interface. Particles exist, and the accuracy of interface position identification is very high. The method for identifying the position of the gas-liquid interface comprises the following steps:
[0069] Step S1: Sow tracer particles in gas and liquid respectively, and then set a light source for illumination;
[0070] Step S2: Use high-speed cameras on both sides of the gas-liquid interface to capt...
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The invention discloses a method for identifying the position of the gas-liquid interface. The method for identifying the position of the gas-liquid interface of the present invention first disperses the tracer particles in the gas and the liquid respectively, and then uses high-speed cameras to take images of the tracer particles on both sides of the gas-liquid interface, and then identifies the initial position in the image. Then, preprocess all the images at the same time to identify the position of the gas-liquid interface in the subsequent frames of images, and then perform time-space smoothing on the obtained gas-liquid interface position, so as to obtain the All the positions of the gas-liquid interface in the image obtained by the camera in the region, and finally the position of the gas-liquid interface in the image obtained by the camera in the area below the shooting interface, can be obtained under the condition that there are particles on both sides of the gas-liquid interface The position of the gas-liquid interface can be accurately identified, and the identification accuracy is high, which can be well applied to near-wall measurement in particle image velocimetry.
Description
technical field [0001] The invention relates to the technical field of particle image velocimetry, in particular to a method for identifying the position of a gas-liquid interface. Background technique [0002] Particle image velocimetry (PIV) is a measurement method often used in fluid mechanics experiments. It can measure the instantaneous velocity field of a fluid in a certain area. Take two photos in a short time, and the velocity of the fluid microgroups in the shooting area can be calculated from the position changes of the tracer particles on the photos in the two moments (this velocity is the velocity on the plane, that is, there are two components) . The most important calculation method is to divide the picture into several small blocks (query windows), and calculate the correlation coefficient of the photo brightness between the small blocks at the earlier time and the small blocks at the later time. The position of the peak value of the correlation coefficient r...
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IPC IPC(8): G01F23/00G01F23/22
CPCG01F23/22G01F23/80
Inventor 李存标陈钧伟
Owner PEKING UNIV