Flow state identification-based radial gate overflow calculation method

A kind of arc gate, flow state technology, applied in the direction of calculation, design optimization/simulation, special data processing application, etc.

Active Publication Date: 2018-09-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to a large number of test results, the method solves two problems in the existing calculation model: the identification parameters and methods of the high Froude number area and t

Method used

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  • Flow state identification-based radial gate overflow calculation method
  • Flow state identification-based radial gate overflow calculation method
  • Flow state identification-based radial gate overflow calculation method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0047] Example 1:

[0048] This embodiment is an arc gate overcurrent calculation method based on flow state identification.

[0049] The traditional hydraulic calculation of the flow through the gate mainly adopts the empirical coefficient model, and the calculation steps are as follows:

[0050] 1) Determine the flow state of the outflow from the gate: h 3 ≤ h c "For free flow; h 3 > h c "Submerged outflow.

[0051] 2) Calculate the flow coefficient using different empirical relations:

[0052] Flow Coefficient of Free Outflow μ 0 :

[0053] ( )

[0054]Discharge Coefficient of Submerged Outflow μ s :

[0055]

[0056] ( )

[0057] 3) Calculate the flow rate of the gate hole:

[0058] ( )

[0059] where: Q is the gate flow; μ is the flow coefficient; e is the gate opening; b is the gate overcurrent width; g is the acceleration of gravity; θ is the opening angle of the arc door; σ is the inundation coefficient; h 1 is the ups...

Example Embodiment

[0099] Embodiment 2:

[0100] This embodiment is an improvement of the first embodiment, and is a refinement of the calculation of the flow coefficient of the first embodiment. The flow coefficient described in this embodiment μ The calculation formula is as follows:

[0101] Flow Coefficient of Free Orifice Flow μ 0 Calculation formula:

[0102] ;

[0103] Discharge coefficient of submerged orifice flow with high Froude number μ s1 Calculation formula:

[0104] ;

[0105] Discharge coefficient of submerged orifice flow with low Froude number μ s2 Calculation formula:

[0106] ;

[0107] in, P is the height of the gate shaft of the arc gate; R is the radius of the arc gate; a 0 , b 1 , b 2 , b 3 is a parameter related to the gate form. The parameters related to the gate form can only be determined after the specific analysis of various gate forms in the design of the gate. The gate shape includes: single-hole gate, or multi-hole gate, and rela...

Example Embodiment

[0108] Embodiment three:

[0109] This embodiment is an improvement of the above-mentioned embodiment, and is a refinement of the gate parameters of the above-mentioned embodiment. The flow coefficient described in this implementation μ is the flow coefficient for a single-hole gate with gate width equal to the downstream channel width:

[0110] Flow Coefficient of Free Orifice Flow μ 01 :

[0111] ;

[0112] Discharge coefficient of submerged orifice flow with high Froude number μ s11 :

[0113] ;

[0114] Discharge coefficient of submerged orifice flow with low Froude number μ s21 :

[0115] .

[0116] In this embodiment, a single-hole gate with the gate width equal to the downstream channel width is used as an example, and the least squares method is used to estimate the model parameters to obtain the flow coefficient relational expressions of different flow states.

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Abstract

The invention relates to a flow state identification-based radial gate overflow calculation method. The method comprises the following steps of: calculating an after-jump conjugate depth of water jumpbehind a gate; calculating an energy consumption ratio; judging a flow state of a lockage water flow; establishing a flow coefficient calculation model; and calculating a gate overflow. According tothe method, flow states of gate hole submerging effluents are subdivided into a high Froude number area and a low Froude number area, the energy consumption ratio is taken as a judging parameter, andthe judging condition is that the flows, the energy consumption ratios Er of which are higher than 1, are submerging effluents of low Froude number and the flows, the energy consumption ratios Er of which are smaller than 1, are submerging effluents of high Froude number. Through the establishment of the judging, theoretical support is provided for the accurate calculation of lockage flows. According to the method, different flow states of lockage water flows are divided through identifying parameters, calculation models of corresponding flow states are established, and test data is used for fitting parameters in the models so as to give an accurate lockage flow calculation method.

Description

technical field [0001] The invention relates to an arc gate overcurrent calculation method based on flow state identification, which is a hydraulic calculation method and an engineering calculation method for arc gate overcurrent. Background technique [0002] Arc gate is a widely used gate type, and this type of gate can be seen in many water conservancy projects. The cross-sectional shape of this gate body is characterized by a smooth curved curve extending from the water surface to the bottom of the water. It has the characteristics of small opening force, good flow state, and convenient operation. It is a relatively excellent gate gate. shape. In the existing flow calculation methods of arc gates, the empirical coefficient model of the outflow from the gate hole can be used for free flow and the submerged flow with high Froude number in the contraction section, but for the flow with low Froude number The calculation accuracy of submerged outflow is poor, and the maximu...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 刘之平郭永鑫郭新蕾胡玮朱锐冯晓波陈清付辉王涛李甲振黄伟马慧敏
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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