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Cross-correlation speed measurement method for reflecting peak pattern characteristics of cross-correlation function

A cross-correlation function and cross-correlation technology, applied in the direction of measuring devices, fluid velocity measurement, velocity/acceleration/shock measurement, etc., can solve the problem that the sensitivity distribution of the measured fluid sensor is not considered, and achieve stable calculation results and speed fluctuations small effect

Pending Publication Date: 2022-01-28
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

The solidification flow pattern assumes that all discrete phases in the pipeline have the same velocity, without considering the influence of the measured fluid velocity profile and sensor sensitivity distribution

Method used

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  • Cross-correlation speed measurement method for reflecting peak pattern characteristics of cross-correlation function
  • Cross-correlation speed measurement method for reflecting peak pattern characteristics of cross-correlation function
  • Cross-correlation speed measurement method for reflecting peak pattern characteristics of cross-correlation function

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Embodiment Construction

[0030] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0031] Install two sensors upstream and downstream of the pipeline, and select a reasonable upstream and downstream spacing L according to the range of fluid flow velocity. If the spacing is too long, the upstream and downstream flow patterns will change greatly, which is not conducive to cross-correlation velocity measurement; if the spacing is too short, a higher data sampling frequency is required. , to satisfy Shannon's sampling theorem.

[0032] This example is implemented in the measurement of the gas-solid multiphase flow velocity in the pipeline. The pipeline uses DN50 stainless steel pipeline. The gas is air, and the solid is quartz sand particles with a particle size of 100 μm. The experimental flow rate ranges from 4 to 8m / s. At th...

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Abstract

The invention relates to a cross-correlation speed measurement method for reflecting peak pattern characteristics of a cross-correlation function. The method considers asymmetry and multi-peak characteristics of the peak pattern of the cross-correlation function when the flow velocity is not uniformly distributed, can obtain a cross-correlation speed measurement result which is more stable than the peak velocity of the cross-correlation function, and is more in line with the actual working condition.

Description

technical field [0001] The invention belongs to the technical field of velocity measurement of a flow sensor, relates to velocity measurement due to non-uniform distribution of a fluid velocity field, and in particular relates to a cross-correlation velocity measurement method reflecting peak-type characteristics of a cross-correlation function. Background technique [0002] Fluid velocity is a key parameter in the field of flow measurement, and cross-correlation velocity measurement is a technique widely used in the field of fluid velocity measurement. The basic idea of ​​the cross-correlation velocimetry technique is to convert the flow velocity measurement into a time interval measurement by analyzing the flow noise signal. According to the assumption of solidification flow pattern, when the fluid flows from a certain section upstream to a certain section downstream, the size distribution and spatial distribution of the discrete phase in the fluid remain unchanged. The s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P5/22
CPCG01P5/22
Inventor 张靖宇
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE