turbulentsivoolumõõturi

A turbulent flow meter, or turbulentsivoolumõõturi in Estonian, is a type of flow meter that measures the rate of fluid flow by detecting the turbulent eddies created by an obstruction in the flow path. These devices are commonly known as vortex flow meters. When a fluid flows past a bluff body, such as a shedder bar or a Von Kármán vortex street generator, it sheds alternating vortices on either side. The frequency at which these vortices are shed is directly proportional to the velocity of the fluid flow.

Turbulent flow meters typically consist of a sensor and a bluff body. The bluff body is installed in the pipeline, and as the fluid passes it, it generates vortices. The sensor, often a piezoelectric crystal, strain gauge, or hot-wire anemometer, is positioned downstream of the bluff body to detect the pressure fluctuations caused by the shedding vortices. These pressure variations generate an electrical signal whose frequency is then analyzed by the meter's electronics. This frequency is then converted into a volumetric or mass flow rate, depending on the meter's calibration and the fluid properties.

The advantages of turbulent flow meters include their robust construction, lack of moving parts (other than the fluid itself), and wide rangeability. They are suitable for measuring the flow of liquids, gases, and steam. They generally do not require frequent calibration and can operate across a broad spectrum of temperatures and pressures. However, they can be susceptible to vibration and may not be ideal for very low flow rates or highly viscous fluids. Their accuracy can also be affected by upstream flow disturbances, necessitating proper installation with sufficient straight pipe runs.