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Virtual two-line energy slope channel flow measuring method

A technology of canals and flow, applied in the measurement of flow/mass flow, liquid/fluid solid measurement, measurement devices, etc., can solve the problems of inability to monitor online, time-consuming and labor-intensive

Pending Publication Date: 2021-08-20
无锡宏聚电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a virtual second-line Nengpo river canal flow measurement method to solve the problems that the existing traditional canal flow measurement method is time-consuming and laborious and cannot be monitored online

Method used

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  • Virtual two-line energy slope channel flow measuring method
  • Virtual two-line energy slope channel flow measuring method
  • Virtual two-line energy slope channel flow measuring method

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Embodiment 1

[0066] The invention provides a virtual second-line Nengpo river canal flow measurement method, such as figure 1As shown, it is used for on-line measurement of channel flow without stagnant water, backflow and smooth flow in various uniform flow and non-uniform flow sections. It is characterized in that the measuring water level and the vertical current meter are installed in the same floating body. Include the following steps:

[0067] A. Determine the positions C1 and C2 of the two vertical lines for measurement, that is, select two positions C1 and C2 for flow velocity measurement on the flow measurement section;

[0068] B. Measure the vertical velocity V1, V2 of two vertical positions C1, C2;

[0069] C. Use the reverse calculation of the vertical flow velocity model to obtain the virtual energy slopes S1 and S2 corresponding to V1 and V2, and calculate the energy slope difference between the two;

[0070] D. According to the requirements of the canal flow test specific...

specific Embodiment approach

[0118] Specific implementation methods: such as Figure 1 to Figure 5 As shown, the present invention provides a virtual second-line energy-slope flow measurement method for river canals, which is suitable for online detection of river and open channel flow. For the convenience of description, firstly, the vertical flow velocity model to be used by the two-line virtual energy-slope flowmeter of the present invention will be described. like figure 1 As shown, the vertical line velocity model is to insert the vertical line into a rectangular section with the same water depth and water surface width equal to the measured water surface width, that is, in the rectangle ABCD shown in the accompanying drawing, and calculate according to the rectangular section vertical line velocity formula The vertical flow velocity in the rectangular section; then insert the vertical line into the triangular section whose top water depth is equal to the vertical line water depth, and the water surf...

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Abstract

The invention discloses a virtual two-line energy slope channel flow measuring method, and belongs to the technical field of channel flow measurement. Under the non-uniform flow condition, two vertical line flow velocities (one on each of the two sides of a midstream) are measured in a flow cross section, two virtual uniform flow energy slopes are obtained through inverse operation of a vertical line flow velocity model established through a uniform flow Chezy-Manning formula, the two virtual uniform flow energy slopes are substituted into the vertical line flow velocity model, the vertical line flow velocity which exceeds the number of times of a manually measured vertical line is calculated, and finally, the flow is calculated by using a partial flow velocity-area method, so that a great technical support is provided for realizing online monitoring of the flow.

Description

technical field [0001] The invention relates to the technical field of river canal flow measurement, in particular to a virtual second-line Nengpo river canal flow measurement method. Background technique [0002] Canal flow measurement methods are usually divided into four types, namely, volume method (weighing method), hydrological (or vertical average flow velocity) flow measurement method, hydraulic formula method, and reagent dilution method. From the perspective of traceability, the volume method has the highest accuracy; the vertical line average flow velocity measurement method is theoretically rigorous, and the flow measurement results are recognized as "true value" by the world; the correlation coefficients in the hydraulic formula method and the reagent dilution method must pass through the vertical line Accreditation of Velocimetry Validation. [0003] In traditional river canal flow measurement, the cross-section is usually known (can be calculated according to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/00
CPCG01F1/00
Inventor 颜开颜承浩
Owner 无锡宏聚电子科技有限公司
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