Decomposition section-based flow velocity measuring method

Abstract

The invention relates to a decomposition section-based flow velocity measuring method. The method includes the following steps that: the flow of a section is measured, so that flow measurement data can be obtained; a plurality of section decomposition lines are set on the flow measurement section, so that the flow measurement section can be divided into a plurality of decomposition sections; the area weight coefficients of each of the decomposition sections are calculated; the flow velocity of each decomposition section is determined; the correlation coefficients of the flow velocity of each decomposition section and the flow velocities of the decomposition sections are determined; the correlation coefficients of the flow velocity of each decomposition section and the average flow velocityof the section are determined; the positions of the section decomposition lines are adjusted, the above steps are repeatedly executed for a plurality of times, so that the area weight coefficients ofeach of the decomposition sections and the correlation coefficients of the flow velocity of each decomposition section and the average flow velocity of the section during the plurality of times of division are obtained; and the flow of representative decomposition sections in the decomposition sections during the plurality of times of division is measured, so that full-section flow can be obtained. According to the decomposition section-based flow velocity measuring method of the invention, the flow of the section is automatically tested through using a fixed-point acoustic Doppler flowmeter,and therefore, the standardability and accuracy of the flow calculation of the section are improved.

Description

technical field [0001] The invention relates to the technical field of hydrological measurement, and in particular, the invention relates to a decomposition section velocity method. Background technique [0002] Open channel flow test usually uses instruments such as rotor type current meter, traveling type acoustic Doppler current meter, fixed-point acoustic Doppler current meter and so on. There are relatively mature flow calculation methods for flow measurement of rotor type current meter and traveling acoustic Doppler current meter, but it is difficult to realize automatic flow measurement. The fixed-point acoustic Doppler current meter can realize automatic flow measurement, but it needs to calibrate the relationship between the representative flow velocity and the average flow velocity of the section. [0003] The rotameter or acoustic Doppler current meter uses fewer vertical lines to measure the flow, and can use the representative vertical line method to analyze an...

AI Technical Summary

Problems solved by technology

However, the Acoustic Doppler fixed-point horizontal test has multiple measurement points (units) flow velocity, and there is no set method for how to calculate the representative flow velocity.

In the past, the cross-section and flow velocity distribution analysis was not carried out based on hydrological tests and hydraulic methods. The flow velocity of a measurement point in an interval was randomly selected and the average calculation was used to represent the flow velocity. It was impossible to determine how representative the selected interval was. The measuring station cannot establish a flow velocity relationship that meets the hydrological specifications, and many fixed-point acoustic Doppler current meter flow measuring stations are difficult to put into use

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