CN114659569A - Channel flow determining method - Google Patents

Channel flow determining method Download PDF

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Publication number
CN114659569A
CN114659569A CN202210316110.3A CN202210316110A CN114659569A CN 114659569 A CN114659569 A CN 114659569A CN 202210316110 A CN202210316110 A CN 202210316110A CN 114659569 A CN114659569 A CN 114659569A
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channel
flow rate
roughness
calculation formula
flow
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谢冈伯
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel

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  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a channel flow Q calculation method in hydraulics, which comprises the following steps: s1: determining a channel type; s2: and calculating the flow of different channels. The channel flow determining method can calculate different channel flows by different channel types, simplifies the calculation process and effectively improves the accuracy and efficiency of the curve channel flow measurement.

Description

Channel flow determining method
Technical Field
The invention belongs to the technical field of channel flow in hydraulics, and particularly relates to a channel flow determination method.
Background
Measuring channel flow is an important issue in hydraulic engineering. The most common open channel section type in the irrigated area is a trapezoidal section, and the outstanding advantages of the channel are regular section, stable side slope, small difficulty in construction technology, strong applicability and the like. However, the trapezoidal section is generally weak in expansion and freezing resistance, and the curved channel section has excellent hydraulic conditions of large flow, strong sand transportation capability and remarkable seepage prevention effect. In particular, as various curved channel sections (such as circular, U-shaped, parabolic, etc.) have been popularized and applied to irrigation drainage engineering and municipal sewage treatment plants, the water flow motion law and hydraulic characteristics of open channels have become a hot spot of current research by technicians. In the conventional specification, the channel section is generally divided by a vertical line, and hydraulic information such as flow velocity of a fixed point on the vertical line is measured, the method is suitable for the conditions that the channel is regular and the channel environment is convenient to measure, and for a curve channel, a corresponding flow measuring method is lacked, and the calculation is carried out in 5-9 steps from a textbook.
Disclosure of Invention
The invention provides a channel flow determining method for solving the problems.
The technical scheme of the invention is as follows: a channel flow determining method comprises the following steps:
s1: determining a channel type;
s2: and calculating the flow of different channels.
Further, in step S1, the channel types include a rectangular channel, a trapezoidal channel, a U-shaped channel, a circular tube channel, and a reinforced concrete circular inverted siphon.
Further, in step S2, the flow rate Q of the rectangular channel1The calculation formula of (2) is as follows:
Figure BDA0003569062700000011
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the channel.
Further, in step S2, the flow rate Q of the trapezoidal channel2The calculation formula of (2) is as follows:
Figure BDA0003569062700000021
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, H represents the depth of the channel, and M represents the coefficient of the side slope of the channel.
Further, in step S2, the flow rate Q of the U-shaped channel3The calculation formula of (c) is:
Figure BDA0003569062700000022
wherein, N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the straight wall on the semi-circle of the cross section.
Further, in step S2, the flow rate Q of the circular tube channel4The calculation formula of (2) is as follows:
Figure BDA0003569062700000023
wherein, N represents the roughness of the pipeline, I represents the bottom slope ratio of the circular pipe, R represents the inner radius of the circular pipe, and F represents the water depth of the arched water section.
Further, in step S2, the flow Q of the reinforced concrete circular inverted siphon5The calculation formula of (2) is as follows:
Figure BDA0003569062700000024
wherein N represents the channel roughness, I represents the channel base slope ratio, H represents the water surface difference of the inlet and the outlet of the inverted siphon, 1.92 represents the water loss sigma coefficient, R represents the pipe radius, g represents the gravity acceleration, and L represents the length of the reinforced concrete circular inverted siphon.
The invention has the beneficial effects that: the channel flow determining method can calculate different channel flows by different channel types, simplifies the calculation process and effectively improves the accuracy and efficiency of the curve channel flow measurement.
Drawings
Fig. 1 is a flowchart of a channel traffic determination method.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a channel flow determining method, including the following steps:
s1: determining a channel type;
s2: and calculating the flow of different channels.
In the embodiment of the present invention, in step S1, the channel types include a rectangular channel, a trapezoidal channel, a U-shaped channel, a circular tube channel, and a reinforced concrete circular inverted siphon.
In the embodiment of the invention, in step S2, the flow Q of the rectangular channel1The calculation formula of (2) is as follows:
Figure BDA0003569062700000031
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the channel water.
In the embodiment of the invention, in step S2, the flow Q of the trapezoidal channel2The calculation formula of (2) is as follows:
Figure BDA0003569062700000032
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, H represents the depth of the channel, and M represents the coefficient of the side slope of the channel.
In the embodiment of the invention, in step S2, the flow Q of the U-shaped channel3The calculation formula of (2) is as follows:
Figure BDA0003569062700000033
wherein, N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the straight wall on the semi-circle of the cross section.
In the embodiment of the invention, in step S2, the flow rate Q of the circular tube channel4The calculation formula of (2) is as follows:
Figure BDA0003569062700000034
Figure BDA0003569062700000041
wherein, N represents the roughness of the pipeline, I represents the bottom slope ratio of the circular pipe, R represents the inner radius of the circular pipe, and F represents the water depth of the arched water section.
In the embodiment of the invention, in step S2, the flow Q of the reinforced concrete round inverted siphon5The calculation formula of (2) is as follows:
Figure BDA0003569062700000042
wherein N represents the channel roughness, I represents the channel base slope ratio, H represents the water surface difference of the inlet and the outlet of the inverted siphon, 1.92 represents the water loss sigma coefficient, R represents the pipe radius, g represents the gravity acceleration, and L represents the length of the reinforced concrete circular inverted siphon.
The invention has the beneficial effects that: the channel flow determining method can calculate different channel flows by different channel types, simplifies the calculation process and effectively improves the accuracy and efficiency of the curve channel flow measurement.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.

Claims (7)

1. A channel flow determining method is characterized by comprising the following steps:
s1: determining a channel type;
s2: and calculating the flow of different channels.
2. The channel flow rate determination method as claimed in claim 1, wherein in the step S1, the channel types include a rectangular channel, a trapezoidal channel, a U-shaped channel, a circular tube channel, and a reinforced concrete circular inverted siphon.
3. The channel flow rate determination method as claimed in claim 1, wherein in the step S2, the flow rate Q of the rectangular channel1The calculation formula of (c) is:
Figure FDA0003569062690000011
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the channel water.
4. The channel flow rate determination method according to claim 1, wherein in the step S2, the flow rate Q of the trapezoidal channel2The calculation formula of (2) is as follows:
Figure FDA0003569062690000012
wherein N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, H represents the depth of the channel, and M represents the coefficient of the side slope of the channel.
5. The channel flow rate determination method as claimed in claim 1, wherein in the step S2, the flow rate Q of the U-shaped channel3The calculation formula of (c) is:
Figure FDA0003569062690000013
wherein, N represents the roughness of the channel, I represents the bottom slope ratio of the channel, B represents the width of the channel, and H represents the depth of the straight wall on the semi-circle of the cross section.
6. The channel flow rate determination method as claimed in claim 1, wherein the flow rate Q of the circular pipe channel in the step S24The calculation formula of (2) is as follows:
Figure FDA0003569062690000021
wherein, N represents the roughness of the pipeline, I represents the bottom slope ratio of the circular pipe, R represents the inner radius of the circular pipe, and F represents the water depth of the arched water section.
7. The channel flow rate determining method of claim 1, wherein in step S2, the flow rate Q of the reinforced concrete circular inverted siphon5The calculation formula of (c) is:
Figure FDA0003569062690000022
wherein N represents the channel roughness, I represents the channel base slope ratio, H represents the water surface difference of the inlet and the outlet of the inverted siphon, 1.92 represents the water loss sigma coefficient, R represents the pipe radius, g represents the gravity acceleration, and L represents the length of the reinforced concrete circular inverted siphon.
CN202210316110.3A 2022-03-28 2022-03-28 Channel flow determining method Pending CN114659569A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117824788A (en) * 2024-03-05 2024-04-05 河海大学 Water level monitoring and analyzing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117824788A (en) * 2024-03-05 2024-04-05 河海大学 Water level monitoring and analyzing system
CN117824788B (en) * 2024-03-05 2024-05-28 河海大学 Water level monitoring and analyzing system

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