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Method for automatically measuring flow of open channel by use of radar speed indicator

A radar velocimeter and automatic measurement technology, applied in the measurement of flow/mass flow, measurement device, liquid/fluid solid measurement, etc., can solve problems such as inappropriate use of channels in gentle irrigation areas and large loss of channel water head, to avoid manual testing. The effect of rated flow rate coefficient

Active Publication Date: 2018-09-28
宁夏晟和科技有限公司
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Problems solved by technology

The weir and flume water level method is to set a standardized water measuring weir and flume in the open channel, and measure the water level at the specified position, so that the flow through the weir and flume has a single value relationship with the water level; measure the water level, according to the corresponding flow formula or empirical formula It is converted into a flow value. Although this method of measuring water is accurate, it will cause a large loss of water head in the channel, and it is not suitable for channels in gentle irrigation areas.

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  • Method for automatically measuring flow of open channel by use of radar speed indicator
  • Method for automatically measuring flow of open channel by use of radar speed indicator
  • Method for automatically measuring flow of open channel by use of radar speed indicator

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Embodiment Construction

[0047] Such as Figure 1~6 As shown, the Ningxia Huinong Canal is selected for the implementation of the Wujihui Channel. This channel is a supplementary renovation project for the continuation of the irrigation area in 2009. The channel is 2,000 meters long and is lined with concrete prefabricated slabs. The slope coefficient m is 1:1.0, the central angle θ of the arc-shaped bottom is 67.5°, the radius r of the arc-shaped bottom is 2.45 meters, the gradient of the channel is 1:3300, and the maximum design flow of the channel is 5m 3 / s. The water diversion of the channel is carried out by 4 water pumps, and the pumping capacity of a single pump sign is 1.05m 3 / s, using a single pump and a single pipeline to enter the canal. In May 2017, a pipeline electromagnetic flowmeter was installed on the outlet pipe of each pump, and a radar speedometer was installed on a fixed steel truss water measuring bridge 600 meters away from the outlet pool. There are three advantages in sele...

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Abstract

A method for automatically measuring flow of an open channel by use of a radar speed indicator comprises steps as follows: the radar speed indicator is arranged above the center of the open channel with a fixed section shape, the height hd of the radar speed indicator above the water surface of the open channel is measured through wave beams perpendicularly shot to the water surface by the radar speed indicator, the sectional area A and the water surface width B of water flow below the radar speed indicator as well as the radar wave covered water surface width s are further solved, a mathematical model is established through the surface flow velocity vsm corresponding to the radar wave covered water surface width s, the average flow velocity vc of the cross section of the whole water bodyis solved, and finally, the flow of the open channel is solved by use of A and vc. The flow velocity coefficient is automatically determined according to the mounting height of the radar speed indicator through the established mathematical model, the flow of the open channel is automatically measured through the radar speed indicator, and manual testing and calibration of the flow speed coefficient are avoided.

Description

Technical field: [0001] The invention relates to the technical field of water conservancy automation, in particular to a method for automatically measuring open channel flow by using a radar speedometer. Background technique: [0002] Open channels refer to open drainage channels and water delivery channels that are not open and under non-pressurized and non-full water conditions. The water in open channels flows due to the decrease in the potential energy of the free water surface formed by the gradient of the water delivery channel. Realizing automatic measurement of water in open channels is one of the directions of research at home and abroad. Realizing automatic water measurement in open channels (ditches) in irrigation districts is an urgent need for irrigation district managers, and it is a technical approach to realize water conservancy information automation. [0003] The measurement of open channel (ditch) flow includes automatic measurement and manual measurement....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/002G01F1/66
Inventor 李银才
Owner 宁夏晟和科技有限公司
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