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『Vortex flowmeter data』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Technical parameters of vortex gas flowmeter
The technical parameters of vortex gas flowmeter are as follows: caliber range: from DN15 to DN3000mm, even larger, with rubber liquid resistance and wide applicability. Nominal pressure: covering 0.6MPa to 42MPa, ensuring stable operation under various working conditions. Working temperature: ranging from 200 ℃ to+500 ℃, and can even withstand higher temperature conditions. Accuracy control: Control within the range of ± 0.2% to ± 1.5% FS to ensure the accuracy of measurement results. Range ratio: 1:10, able to adapt to flow changes and provide a wide measurement range. Shell material: Available in carbon steel and stainless steel, or with fluorine lining. Power supply method: Equipped with a built-in 3.6VDC lithium battery, with a replacement cycle of two years; Simultaneously supporting external 24VDC power supply, providing flexibility. Output signal: Provides standard 4-20mA two-wire signal and pulse output 0-1000Hz; supports RS232/RS485 interface, can be customized according to Liang Chuns needs. Protection level: IP65, ensuring safe operation of the equipment in various environments. Safety performance: Compliant with explosion-proof standards, certified with intrinsic safety ExiallCT4 and explosion-proof ExdllCT4. Header display function: including cumulative flow rate, instantaneous flow rate, operating temperature, operating pressure, and self inspection of buried rubber barriers, providing comprehensive real-time and long-term operating information. Connection methods: including taper pipe thread type, clamp type, and double flange type, ensuring seamless connection with various pipeline systems.
2. Introduction to the principle of vortex flowm
Vortex flowmeter works based on the principle of fluid oscillation, and its core is to calculate the flow rate by detecting the frequency of vortices generated in the fluid.
. The specific principle is as follows: Vortex generation mechanism: When the fluid flows through the triangular column vortex generator of the vortex flowmeter, it will alternately produce two rows of symmetrical vortices (Karman vortex street) behind it. The release frequency of vortices is directly related to the fluid flow velocity and the characteristic width of the vortex generator. The relationship between vortex frequency and flow velocity. The formula for vortex release frequency is: f=St · v/df: vortex release frequency (Hz); v: Average fluid velocity (m/s); d: Characteristic width of vortex generator (m); St: Strouhal number (dimensionless), ranging from 0.14 to 0.27, is a function of Reynolds number (Re) (St=f (l/Re)). When the Reynolds number Re is between 102 and 10? When within the range, St≈0.2， At this point, the frequency formula is simplified as: f=0.2 · v/d. Flow velocity derivation during flow calculation process: By measuring the vortex frequency f and combining it with known values of d and St, the average fluid velocity v (v=f · d/St) can be deduced. Flow calculation: According to the volumetric flow formula q=v · A (A is the cross-sectional area of the fluid flowing through the vortex generator), the final flow value q is obtained. Signal detection and conversion piezoelectric sensor function: When vortices alternate on both sides of the generator, they will cause alternating lift perpendicular to the fluid flow direction. The piezoelectric sensor detects the periodic variation of lift and converts it into the