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Entrained air concentration measuring device and method

A gas-entrainment concentration and measurement device technology, which is applied in the field of hydraulic parameter measurement and aeration concentration measurement devices, can solve the problems of poor measurement accuracy of the image method, difficulty in obtaining a clear image, difficulty in separating water and air bubbles, etc., and achieve high precision , The measurement method is simple and direct, and the effect of easy assembly

Active Publication Date: 2018-04-17
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

The image method can well reflect the actual movement of the bubbles, but when the aeration concentration is high and the bubble movement speed is too fast, it is difficult to obtain a clear image, and it is difficult to separate water and bubbles due to the overlap of the bubbles, making the image method The measurement accuracy is poor under the condition of high gas concentration

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  • Entrained air concentration measuring device and method

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with drawings and embodiments.

[0016] see figure 1 , a device for measuring aeration concentration, comprising a peristaltic pump 1, a clamping rod 2, a water collection bottle 3, an electronic balance 4, a stopwatch 5 and a video camera 6, and the hose 7 provided by the peristaltic pump 1 is connected to the clamping rod 2 at the inlet end , the clamping rod 2 is used to keep the inlet of the flexible pipe 7 on the measuring position (measuring point), and a water collecting bottle 3 is arranged under one end of the outlet of the flexible pipe 7, and the water collecting bottle 3 is placed on an electronic balance 4, and the electronic balance 4 A stopwatch 5 is arranged next to it, and a video camera 6 is arranged in front of the electronic balance 4 . In a model test, the present invention was used to measure the aerated concentration of different measuring points, wherein the peristaltic pump 1 ...

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Abstract

The invention discloses an entrained air concentration measuring device and method. The measuring device comprises a peristaltic pump, wherein a hose equipped on the peristaltic pump is connected witha clamping rod at one end of an inlet; a water collection bottle is arranged below one end of an outlet of the hose; the water collection bottle is arranged on an electronic scale; a second chronograph is arranged beside the electronic scale; and a camera is arranged in front of the electronic scale. The measuring method utilizing the measuring device comprises the following steps: continuously extracting entrained air water flow on a measuring point at a certain rotation speed by using the peristaltic pump, and calculating a mass flow rate Q1 of the entrained air water flow by utilizing readings of the electronic scale and the second chronograph; continuously extracting non-entrained air water flow at the same rotation speed by using the same peristaltic pump, and calculating a mass flowrate Q2 of the non-entrained air water flow; and finally, calculating an entrained air concentration C at the measuring point by utilizing the mass flow rates Q1 and Q2, wherein the calculation formula is C=1-Q1 / Q2. The measuring device and method disclosed by the invention are easy and convenient to use and can well adapt to conditions of high entrained air concentrations.

Description

technical field [0001] The invention relates to the measurement technology of hydraulic parameters in the field of water conservancy engineering, in particular to an aeration concentration measurement device and a measurement method. Background technique [0002] Water flow aeration often occurs in hydraulic jumps, falling water flows, projecting water flows and high-speed open channel water flows. Aeration concentration is an important hydraulic parameter in aerated water flow. The basic measurement method of aeration concentration is the sampling method, which generally uses a negative pressure sampler, and then the sample is subjected to water and gas separation treatment, and the air volume and water volume are measured respectively, and the aeration concentration is obtained according to the definition. The sampling method is accurate in measurement, but the equipment is complex and the measurement process is cumbersome. [0003] At present, the measurement of the aer...

Claims

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Application Information

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IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 肖柏青张红梅张政戎贵文
Owner ANHUI UNIV OF SCI & TECH
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