Synchronous measuring system of concentration of silt and fluctuation velocity of water flow of low concentration muddy water

A pulsating velocity, synchronous measurement technology, applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc. Realize the effect of long-term measurement and pulse concentration measurement

Active Publication Date: 2014-04-23
HOHAI UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, regarding the influence of suspended matter on water flow energy loss, the existing research results have always been inconsistent. The important reason is that there is a lack of devices that can simultaneously measure sediment concentration and water flow velocity, and cannot effectively analyze suspended matter particles and water flow fluctuations. Interaction between speed

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  • Synchronous measuring system of concentration of silt and fluctuation velocity of water flow of low concentration muddy water
  • Synchronous measuring system of concentration of silt and fluctuation velocity of water flow of low concentration muddy water
  • Synchronous measuring system of concentration of silt and fluctuation velocity of water flow of low concentration muddy water

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Experimental program
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Effect test

Embodiment 1

[0033] The study of low-concentration muddy water is often carried out in a laboratory tank with a length of 12 m, a width of 0.42 m, and a height of 0.7 m. A constant and uniform flow of muddy water with a water depth of 15 cm and a stable concentration is formed in the tank. The concentration of sediment in the water depth direction is different, and the accurate concentration of sediment at different water depths can be determined by using the sediment sampling device. When the Acoustic Doppler Flow Meter 3 is working, the signal intensity in the water depth direction is also different. The correlation analysis between the sediment concentration and the signal intensity is carried out. The corresponding relationship between the two is as follows: figure 2 shown. From this, the functional relationship between the signal strength and the sediment concentration is determined, such as image 3 shown.

[0034] The correlation between the sediment concentration and the signal ...

Embodiment 2

[0036] The water flow conditions and the average concentration of sediment in the laboratory tank were changed to form a constant and uniform muddy water flow with a water depth of 12 cm and a stable concentration in the tank. Similarly, the concentration of sediment in the water depth direction is different, and the accurate sediment concentration value can be determined by the sediment sampling device. When the Acoustic Doppler Current Meter 3 works, the signal strength in the water depth direction is also different. The experimental results show that the corresponding relationship between the two is as follows: Figure 4 shown. From this, the functional relationship between the signal intensity and the sediment concentration can be determined, such as Figure 5 shown.

[0037] The correlation between the signal intensity and the sediment concentration reaches 0.987. The relationship between the signal intensity and the sediment concentration can be used to calculate the s...

Embodiment 3

[0039]When the Acoustic Doppler Velocimeter 3 works in muddy water, the scattering of the acoustic signal by the sediment concentration will weaken the signal strength, and if the sediment concentration is too high, it may even cause the Acoustic Doppler Velocimeter 3 to fail to work normally in muddy water. like Image 6 As shown, the working condition of the acoustic Doppler flow meter 3 was verified when the concentration of sediments with particle sizes of 0.089mm, 0.119mm, 0.234mm, 0.425mm, and 0.75mm was changed from small to large. During the test, fix the probe of the Doppler current meter underwater, keep the distance between the transmitting probe and the bed surface unchanged, gradually increase the sediment concentration, and observe the distance between the probe and the bed surface measured by the acoustic Doppler current meter 3 value.

[0040] When the sediment volume ratio concentration is less than about 0.014, the measurement result is stable, and when the ...

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Abstract

The invention discloses a synchronous measuring system of the concentration of silt and the fluctuation velocity of water flow of low concentration muddy water. The system comprises a silt sampling device and an acoustic Doppler velocimeter. In a measurement, the silt sampling device is adopted to accurately sample silt liquor and determine the average concentration value of silt; meanwhile, the acoustic Doppler velocimeter is adopted to measure the fluctuation velocity of water flow and output the average signal strength and the pulse signal strength; then, according to the average signal strength and the average concentration value of silt, a function relation between the signal strength and the silt concentration is established; corresponding silt concentration value is calculated by means of the established function relation and the pulse signal strength, so that the concentration of silt and the fluctuation velocity of water flow are synchronously measured. According to the system disclosed by the invention, synchronous information of the concentration of silt and the fluctuation velocity of water flow can be effectively obtained. In the measuring process, the water flow in a measuring point position is not disturbed, so that the long time measurement and the pulse concentration measurement of silt concentration can be realized.

Description

technical field [0001] The invention relates to a synchronous measurement system of sediment concentration and water flow pulsation speed in low-concentration muddy water, belonging to the technical field of water flow measurement. Background technique [0002] In terms of measuring the pulsating flow velocity of water flow, there are many mature instruments, such as laser Doppler flow meter, particle image velocimeter, acoustic Doppler flow meter, etc., which can obtain ideal pulsating flow velocity data. However, in the muddy water flow, due to the influence of suspended sediment, the optical signal is seriously attenuated in the water flow, and laser Doppler current meter, particle image velocimeter, etc., which rely on laser to measure the flow velocity, are difficult to apply. The Acoustic Doppler Velocimeter relies on ultrasonic signals to measure flow velocity. In low-concentration muddy water, the ultrasonic signal attenuation is small, which can realize long-term co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06G01N1/10G01P5/24
Inventor 吕升奇唐洪武陈红袁礼伟郭美娇白雪冰
Owner HOHAI UNIV
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