Open Channel Flow Meter Types and Interpretation

Abstract: The types and interpretation information of open channel flow meters are provided by excellent flowmeter and flowmeter manufacturers. Types and explanations of open channel flow meters 1: Overview A waterway that is not full of pipes is called an open channel (open channel I), and an instrument that measures the flow of water in an open channel is called an open channel flowmeter. In addition to circular, open channel circulation cross-sections are also U-shaped, trapezoidal, and rectangular. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the types of open channel flowmeters and the details of the explanation articles. Types and explanations of open channel flow meters: Overview A waterway that is not full of pipes is called an open channel (open channel I), and an instrument that measures the flow of water in an open channel is called an open channel flowmeter. In addition to the circle, the open channel circulation section also has U-shaped, trapezoidal, rectangular and other shapes. Waterways are classified according to their forms, and each form is shown in Figure 1. ISO usually refers to a full water pipe as a closed pipe, and the flow is forced flow under the action of pump pressure or high tank energy. Open channel flow is a free surface flow formed by the slope of the waterway itself. Open channel flowmeters are used in urban water supply diversion channels, thermal power plant cooling water diversion and drainage channels, sewage treatment inflow and discharge channels, industrial and mining enterprise wastewater discharge, and water conservancy projects and agricultural irrigation channels. This article focuses on the flow measurement methods and instruments used in the previous industries and utilities, excluding larger water conservancy projects and flow measurement methods for agricultural irrigation. Some foreigners estimate that in 1995, the number of open channel flowmeters sold in the global industry and public utilities accounted for about 1.6% of the total flow meters, about 35,000 units; if users such as simpler weirs are included, they can make their own meters that have not been purchased from the market. Actually use more. There are no estimates for domestic applications. Two: Types of open channel flow meters commonly used in industry and public utilities can be roughly divided into weir method, flow measurement groove method, flow velocity-water level calculation method and electromagnetic flowmeter method according to the measurement principle. 1) Weir method A baffle is installed at the appropriate position of the open channel, the water flow is blocked, the water level rises to the upper weir (missing) mouth of the baffle, and then flows out from the weir mouth. The flow of water just outflow is less than the original flow in the channel, the water level continues to rise, and the outflow flow increases accordingly, until the outflow is equal to the original flow of the channel, the water level stabilizes at a certain height, and the flow can be obtained by measuring the height of the water level. 2) The flume (flume for short) method reduces a section of the channel into a throat section, the flow velocity increases due to the reduced area of ​​the throat, and the upstream water level is raised to increase the kinetic energy required for the flow velocity (that is, the increased kinetic energy is determined by The raised water level can be converted), measure the raised water level to obtain the flow. 3) Flow velocity-water level calculation method (referred to as flow velocity-water level method) Measure the flow velocity of a certain part (point, line or small area) of the circulation channel, which represents the average flow velocity, and then measure the water level to obtain the flow area, and multiply the local flow velocity and the average flow velocity. The coefficient is calculated to obtain the flow rate. 4) Electromagnetic flowmeter method It is further divided into two types: submersible electromagnetic flowmeter and non-full pipe electromagnetic flowmeter, the latter has not yet been developed in China. The submersible electromagnetic flowmeter is to set a baffle in the channel to intercept the flow, and the baffle has a hole near the bottom and is equipped with a submersible electromagnetic flow sensor. The sensor of the electromagnetic flowmeter with a non-full pipe is directly installed on the pipeline with a circular underdrain of the same diameter. The principle of measuring the flow rate is the same as that of the traditional electromagnetic flowmeter, but it also has the function of measuring the water level in the instrument. The electrode, magnetic circuit and measuring circuit have big difference. The above is the whole content of this article. 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