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Shandong Weikong Instrument Technology Co., Ltd
WK-LUGB Pipeline Vortex Flow Meter
NegotiableUpdate on 12/11
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Overview
The LUGB vortex flowmeter measures the volumetric flow rate, standard condition volumetric flow rate, or mass flow rate of gases, vapors, or liquids based on the Karman vortex principle. And it can be used as a flow transmitter in applications and automation control systems.
Product Details
Product types and scope of application:
1. LUGB/E series full tube vortex flowmeter
2. LUGB/E series plug-in vortex flowmeter
LUCB/E type vortex flowmeter is widely used in industries such as petroleum, chemical, metallurgical, thermal, textile, paper, etc. for measuring superheated steam and saturationSteam, compressed air and general gases (oxygen, nitrogen, hydrogen, natural gas, coal gas, etc.), water and liquids (such as water, gasoline, alcohol, benzene, etc.)Measurement and control of (etc.)
working principle:
If a non streamlined vortex generator (fluid barrier) is set up in the fluid, two regular vortices are alternately generated from both sides of the vortex generator, which are called Karman vortices, as shown in Figure (1).
Figure (1)
Form alternating and regular vortex columns downstream of the vortex generator. Assuming the frequency of vortex occurrence is f and the average velocity of the incoming flow of the measured medium is V,The width of the upstream face of the vortex generator is d. According to the principle of Karman vortex street, there is the following relationship:
f=StV/dFormula (1)
In the formula:The frequency of the Karman vortex generated on one side of the f-body is HZ
St Strouhal number (dimensionless number)
Average flow velocity of V-fluid (m/s)
The width of the vortex generator (m)
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).
Figure (2)
In the straight part of the curve table with St=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 detected, the flow velocity of the fluid inside the pipe can be obtained, and the volumetric flow rate can be calculated from the flow velocity V. The ratio of the measured number of pulses to the volume is called the instrument constant (K), as shown in equation (2)
Formula (2) for K=3600f/Q (1/m ')
In the formula: K=instrument constant (m ").
F=number of pulses
Q=volumetric flow rate (m2)
Main technical indicators:
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