Vortex Flow Meter
Vortex flow meter can be used for measuring gas, and it has price edge, and the temperature of gas can reach to -50-250C.
Working Principle
To install a vortex generator (bluff body) in the fluid, which can produce regular vortex at both sides of the vortex generator alliteratively. Such vortex is called Karman Vortex. Vortex trains are asymmetrically arranged at the downstream of the vortex generator. Suppose the generating frequency of the vortex is f, the average speed of the incoming flow of the tested medium is V, the head-on width of the vortex generator is d, and the diameter of the flowmeter is D, and base on the principles of Karman Vortex, the following relations will be obtained:
cart（1）
f=StV/d Formula (1)
Note: f- Suppose the generating frequency of the vortex
St-Strouhal number
V-average flow velocity at both sides of the vortex generator
d- the vortex generator body width
Details
Thus, by measuring the Carmen frequency of vortex separation of instantaneous flow rate can be calculated. Among them, Strouhal number ( St ) is a dimensionless unknown, Figure ( two) said the Strouhal number ( St ) and Reynolds number ( Re ) relationship.
In the curve St = 0.17straight section, whirlpool release frequency and velocity proportional to, namely the vortex flow sensor measurement range. As long as the detected frequency f can be obtained within the tube by the flow rate of the fluid, flow velocity and volume flow rate V. The measured pulse number and volume ratio, called the instrument constant ( K ), see type (2)
K＝N/Q（1/m³） Formula (2)
K＝Instrument constant（1/m³）
N＝Pulse number
Q＝Volume flow（m³）
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