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1. Flow calculation of vortex flowmeter
The flow calculation of vortex flowmeter is mainly achieved through the following steps and formulas: measuring the frequency of vortex occurrence: The vortex flowmeter first measures the frequency of vortex occurrence, which is directly related to the average flow velocity of the measured medium. The formula for calculating frequency is: f=Sr * U1/d=Sr * U/m, where Sr is the Strouhal number, reflecting the strength of the vortex; U1 is the average flow velocity on both sides of the vortex generator; D is the width of the upstream face of the vortex generator; M is the ratio of the bow shaped area on both sides of the vortex generator to the cross-sectional area of the pipeline. Calculate volumetric flow rate: The formula for calculating volumetric flow rate Li Zao is: qv=π * D2 * U/4=π * D2 * md * f/4 * Sr, where D is the diameter of the body. By using this formula, the measured vortex frequency can be converted into actual volumetric flow rate. Determination of instrument coefficient: The instrument coefficient hall disturbance K, which corresponds to the number of pulses per cubic meter of flow, is an important parameter for vortex flowmeters. The formula for calculating the instrument coefficient K is: K=)? 1. It reflects the characteristics of the flow meter. Considering calibration and compensation under different conditions: In practical applications, vortex flowmeters need to measure different parameters under standard and working conditions, such as volume flow rate, absolute pressure, thermodynamic temperature, and gas compression coefficient. These data help calibrate and compensate for the performance of flow meters under different conditions, ensuring measur
2. Flow range of vortex flowmeter
The flow range of vortex flowmeter is mainly determined by the sensor diameter and fluid properties. The larger the diameter, the wider the measurable flow range.
. The conventional liquid measurement range is between 0.5m/s and 7m/s flow rate, and the gas measurement range is between 5m/s and 60m/s. 1. Correspondence between caliber and flow rate (under normal temperature water conditions) The flow range is directly related to the instrument caliber, and the following are typical parameters (referring to the product manuals of mainstream domestic manufacturers such as Chuanyi and Ganges in 2023): • DN15: minimum about 1.2 m ³/h, maximum about 15 m ³/h • DN25: minimum about 3 m ³/h, maximum about 40 m ³/h • DN50: minimum about 10 m ³/h, maximum about 150 m ³/h • DN100: minimum about 40 m ³/h, maximum about 650 m ³/h • DN200: minimum about 150 m ³/h, maximum about 2500 m ³/h • DN300: minimum about 300 m ³/h, maximum about 5500 m ³/h. 2. Influence of fluid medium • Liquid measurement (Water, oil, etc.): The flow rate range is usually 0.5-7 m/s, and liquids with viscosity higher than 30cP will significantly increase the measurement lower limit. Gas measurement (air search, steam, etc.): The flow rate range is usually 5-60 m/s, and low-pressure gases may have an increased lower limit flow rate due to low density. • Steam measurement: It is necessary to d