Pipe section flange connected vortex flowmeter

OneTypes and scope of application of products

1. TDZC-LUGB series full tube piezoelectric vortex flowmeter

2. TDZC-LUGB series plug-in piezoelectric vortex flowmeter

3. TDZC-LUGE series full tube capacitive vortex flowmeter

4. TDZC-LUGE series plug-in capacitive vortex flowmeter

5. TDZC-LUGB/E series battery powered vortex flowmeter

6. Submersible/Split Vortex Flow Meter (Protocol Order)

7. Multi functional curve recording integrator with P/T compensation function and Chinese LCD display

8. Intelligent traffic integrator with digital display

The TDZC-LUGB/E vortex flowmeter is widely used in industries such as petroleum, chemical, metallurgical, thermal, textile, and papermaking for measuring and controlling superheated steam, saturated steam, compressed air, and general gases (oxygen, nitrogen, hydrogen, natural gas, coal gas, etc.), water, and liquids (such as water, gasoline, alcohol, benzene, etc.)

IIworking principle

If a non streamlined vortex generator (flow resistant fluid) is set up in the fluid, two columns of regular vortices are alternately generated from both sides of the vortex generator. This type of vortex is called a Karman vortex street, as shown in Figure (1).The vortices are arranged asymmetrically downstream of the vortex generator. Let the frequency of vortex occurrence bef， The average velocity of the incoming flow of the measured medium is V, and the vortex generator is upstreamThe width of the face isd， The diameter of the body is D. According to the principle of Karman vortex street, there is the following relationship:

Formula (1) for f=StV/d

Where:

F - frequency of Karman vortex generated on one side of the body

St Strouhal number (dimensionless number)

V - Average flow velocity of fluid

D - width of vortex generator

From this, it can be seen that the instantaneous flow rate can be calculated by measuring the separation frequency of the Karman vortex street. Among them, Strouhal number (St) is an dimensionless unknown variable,

Figure (2) shows the relationship between Strouhal number (St) and Reynolds number (Re).

In the curve tableSt＝The straight part of 0.17, the frequency of vortex release is proportional to the flow velocity, which is the measurement range of the vortex flow sensor. As long as the frequency f is detectedThe flow velocity of the fluid inside the pipe can be obtained by measuring the flow velocityCalculate the volumetric flow rate for V. The ratio of the measured number of pulses to the volume is called the instrument constant (K), as shown in equation (2)

K=N/Q (1/m ³) formula (2)

In the formula: K=instrument constant (1/m ³).

N=number of pulses

Q=Volume flow rate (m ³)

IIIMain technical indicatorsTable (1)