Principle classification of turbine flowmeter

Turbine flowmeters are classified according to measurement principles: propagation time method, Doppler effect method, beam offset method, correlation method, and noise method. The propagation time method also includes the time difference method, the phase difference method and the frequency difference method, and the time difference method measures the principle of fluid flow. It uses the characteristics of different propagation speeds due to different fluid flow directions when the sound wave propagates in the fluid, and measures the difference between its downstream propagation time and countercurrent propagation time t2, thereby calculating the velocity and flow rate of the fluid flow. The advantages of the time-difference ultrasonic flowmeter are: (1) It is suitable for the measurement of various pipe diameters. The larger the flow velocity and pipe diameter, the higher the accuracy; (2) The measurement range (turndown ratio) is wide, generally 1:50 ;(3) No pressure loss, which can greatly reduce the cost of long-distance pipeline pressurization; (4) No moving parts, two-way measurement. However, there are also some deficiencies in the transit-time ultrasonic flowmeter. For example, there are many parameter settings, including: pipe diameter, wall thickness, lining, material, measurement medium, medium temperature, installation method, installation location, etc., and any parameter setting has a deviation All may have an impact on the flow coefficient of the ultrasonic flowmeter.

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