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A sensor and measurement method for measuring water flow aeration concentration

An air-entrained concentration and sensor technology, which is applied in the field of hydropower engineering survey and design, can solve the problems that the rectangular pole piece sensor cannot adapt to the change of the water flow direction, the sensitivity is difficult to improve, and the linear length is increased. The effect of perimeter

Active Publication Date: 2020-02-07
POWERCHINA ZHONGNAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the condition of a certain outer peripheral size of the sensor, it is difficult to effectively increase the linear length of the rectangular electrode sheet, and it is difficult to improve the sensitivity; the rectangular electrode sheet sensor has strong directionality, and the long side direction of the electrode sheet should be parallel to the water flow direction when installing the sensor. For a measuring point, due to different hydraulic conditions, the direction of water flow is not exactly the same, and the rectangular electrode sensor cannot adapt to the change of water flow direction; the measurement area of ​​the sensor is the area surrounded by the outer envelope of the two electrode pieces , the area is narrow and long, and the representation is not strong

Method used

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  • A sensor and measurement method for measuring water flow aeration concentration
  • A sensor and measurement method for measuring water flow aeration concentration
  • A sensor and measurement method for measuring water flow aeration concentration

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A sensor for measuring the aeration concentration of water flow, such as Figure 3 to Figure 4 As shown, including a central electrode 2, an annular electrode 3, a lead wire 4, and a body 1, the diameter of the central electrode 2 is 30 mm, the inner diameter of the annular electrode 3 is 40 mm, and the outer diameter is 50 mm. Made of stainless steel; the lead-out wires 4 are respectively connected to the bottom of the central electrode 2 and the ring-shaped electrode 3; flush, and the central axes of the two coincide; the body 1 is made of insulating PVC gray plastic board, with a diameter of 96mm and a thickness of 14mm, and a screw hole 5 is opened on the panel for fixing the sensor. This embodiment can be used for hydraulic prototype observation. Table 1 compares the conductivity values ​​measured by the traditional rectangular pole piece sensor used for hydraulic prototype observation with Example 1 for solutions with different electrolyte contents, and the measu...

Embodiment 2

[0043] In this embodiment, under the same situation as that of Embodiment 1, the diameter of the central electrode 2 is set to 20mm, the inner circle diameter of the annular electrode 3 is set to 24mm, and the outer circle diameter is set to 30mm. become. This embodiment can be used for hydraulic model tests. Table 2 is the comparative measurement value of the traditional rectangular pole piece sensor used for hydraulic model tests and embodiment 2, and obtains the comparative measurement relationship between the sensor measurement value of the present embodiment and the model rectangular pole piece sensor by linear fitting, Such as Figure 6 As shown, the measured value of embodiment 2 is 1.661 times that of the traditional sensor. It can be seen that compared with the traditional sensor, the measured value of the conductivity of the present embodiment changes more sensitively, so the sensor of the present embodiment can sense the conductance of the aerated water flow. The ...

Embodiment 3

[0047] The sensor for measuring the aeration concentration of water flow in this embodiment, such as Figure 7 , Figure 8 As shown, it includes a sensor body 1, a center electrode 2, a circular electrode 3, and a lead wire 4; the sensor body 1 is a cylinder with a diameter of 60mm and a height of 60mm, and is made of insulating material; the center electrode 2 is a cylindrical electrode , with a diameter of 30mm; the inner diameter of the annular electrode 3 is 40mm, the outer diameter is 50mm, and the electrode height is 30mm. Both the central electrode 2 and the annular electrode 3 are made of graphite with a Shore hardness (HSD) of 60 The central axes of the two are coincident; the lead-out wires 4 are connected to the bottoms of the central electrode 2 and the circular electrode 3 respectively. When in use, the sensor is embedded in the measurement area, and the upper surface of the sensor is flush with the surface to be measured.

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Abstract

The invention relates to a sensor for measuring the concentration of entrained air in water flow. The sensor comprises a body (1). A central electrode (2) and a ring-shaped electrode (3) are arranged in the body (1), the central axis of the ring-shaped electrode (3) coincides with the central electrode (2), and the central electrode (2) and the ring-shaped electrode (3) are connected with two corresponding outgoing lines (4). The sensor has the advantages that the sensor is convenient to mount, and the mounting directions do not need to be considered during mounting; the sensor is high in measurement regional representativeness and reaction sensitivity, low in measurement error and favorable for acquiring accurate measurement results.

Description

technical field [0001] The invention belongs to the field of hydropower engineering survey and design, and in particular relates to a sensor and a measurement method for measuring the aeration concentration of water flow. Background technique [0002] For drainage structures of water conservancy and hydropower projects, the chute is a channel to restrict and guide the water flow. When the flow rate of the chute is high, the concrete surface of the drainage structure is prone to cavitation damage. The usual solution is to Bottom aeration facilities and side wall aeration facilities are installed inside, and the function of aeration facilities is used to force the high-speed water flow to aerate, so as to achieve the purpose of reducing cavitation damage. The aeration concentration of water flow is an important index to measure the effectiveness of aeration facilities. According to the working principle of the conductivity measuring instrument, we can measure the conductivity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/07G01N27/10
CPCG01N27/07G01N27/10
Inventor 戴晓兵
Owner POWERCHINA ZHONGNAN ENG
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