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1. Doppler open channel flowmeter
2. What parameters are related to the speed of the vortex flowmeter
The measured slip amount speed (i.e. instrument display or output frequency) of the vortex flowmeter (usually referring to vortex flowmeters) is mainly directly related to the following parameters
1. Fluid physical parameters • Flow rate: Flow rate is proportional to the source flow rate, and the faster the flow rate, the higher the frequency generated by the vortex flowmeter.
. • Fan collapse density: affects the thrust generated by the vortex body, indirectly affects the signal strength, but does not directly change the frequency. • Viscosity: High viscosity fluids can weaken the stability of vortex streets, leading to measurement errors or signal loss in the low-frequency range2. Instrument structural parameters • Shape and size of vortex street generators: The Strouhal number (St) of different shapes such as triangular and trapezoidal columns varies, directly affecting the conversion relationship between frequency and flow velocity. • Pipeline diameter: The larger the diameter, the lower the flow velocity at the same flow rate, and the corresponding output frequency decreases
3. Working environment parameters • Temperature: affects fluid density and viscosity, indirectly changing instrument coefficients (temperature compensation is required). • Pressure: High pressure may alter pipeline deformation and fluid density, requiring pressure compensation calibration
4. Signal processing parameters • Amplifier filtering settings: Improper cutoff frequency of high/low-pass filters can suppress effective signals. Sensitivity threshold: If the threshold is too high, it will miss l
3. How to set the frequency of a vortex flowmeter
The frequency setting of a vortex flowmeter is not directly performed, but is automatically generated based on the principle of fluid oscillation.
. The following is an explanation about the frequency of the vortex flowmeter: Frequency generation principle: The vortex flowmeter works based on the principle of fluid oscillation. When the fluid passes through the vortex flowmeter leakage transmitter, alternating vortices will be generated under specific structures. The release frequency of these vortices is related to the average velocity of the fluid and the characteristic width of the vortex generator. Frequency calculation formula: The release frequency f of the vortex can be calculated using the formula f=Stv/d, where f represents the release frequency of the vortex, v represents the average velocity of the fluid flowing through the vortex generator, d is the characteristic width of the vortex generator, and St is the Strouhal number. The relationship between frequency and flow velocity: In a vortex flowmeter, the vortex frequency f is directly proportional to the average fluid