There are significant differences between turbine flow meters and vortex street flow meters in terms of working principles, structures, measurement accuracy, applicability, as well as price and maintenance. ‌

working principle

Vortex flowmeter: Using the Karman vortex principle, when the fluid flows through the vortex flowmeter, two columns of vortices proportional to the flow velocity will be alternately generated up and down behind the vortex generator in the triangular column. By measuring the frequency of these vortices, the flow rate of the fluid can be calculated. ‌12

Turbine flowmeter: based on the principle of fluid impacting turbine blades to rotate them. When fluid passes through a pipeline, it generates a driving torque on the turbine, causing it to rotate. Within a certain flow range, the rotational angular velocity of the turbine is directly proportional to the fluid flow velocity. By detecting the speed of the turbine, the flow rate of the fluid can be calculated.

structure

Vortex flowmeter: composed of vortex generator, fluid channel, and detector. There is a vortex street set in the center of the flow channel, with a circular cross-section and a narrow opening in the middle. ‌2

Turbine flowmeter: composed of turbine, guide vane, housing, and transmitter. The two ends of the turbine are supported by bearings and usually include a preamplifier and display instrument.

measurement accuracy 

Vortex flowmeter: The measurement accuracy can generally reach an error range of ± 1% to ± 2%. Although its accuracy is slightly lower than that of a turbine flowmeter, it has lower requirements for fluid properties and a wider range of applications.

Turbine flowmeter: With high measurement accuracy, it can generally achieve an error range of ± 0.5% to ± 1%. But there are certain requirements for the physical properties of the fluid, such as paying attention to changes in parameters such as viscosity, temperature, and pressure of the fluid.

Scope of application

Vortex flowmeter: suitable for measuring various media such as gas, liquid, and steam. Low requirements for fluid properties, suitable for fluids containing impurities, dust, and particulate matter.

Turbine flowmeter: also suitable for measuring fluids such as gases, liquids, and vapors. However, it is necessary to pay attention to changes in the physical properties of the fluid during use to avoid affecting the measurement results.