Steam flow meter working principle
Steam flow meter working principle
At present, there are two types of steam flow meters used in the domestic market. One steam flow meter is electronic, and the other is mechanical. The mechanical products are eliminated products. The accuracy is poor, and the temperature is low. Now I will explain it to everyone. , AK-LUGB intelligent steam flow meter works,
When a non-streamlined vortex generator (baffle) is placed in the fluid, two rows of regular vortices are generated alternately from both sides of the vortex generator. This vortex is called a Karman vortex, as shown in Figure (a).
Figure (a)
Alternating vortex trains are formed downstream of the vortex generators. Let the frequency of vortices be f, the mean velocity of the incoming medium to be measured be V, and the width of the incoming surface of the vortex generating body be d. According to the principle of Karman vortex street, there are the following relationships:
f=StV/d Formula (1)
In the formula:
f - Karman vortex frequency HZ generated on the side of the generator
St-Strouhal number (dimensionless number)
V-fluid average flow rate (m/s)
d-Width of vortex generator (m)
It can be seen that the instantaneous flow rate can be calculated by measuring the Karman vortex street separation frequency. Among them, the Strouhal number (St) is a dimensionless unknown,
Figure 2 shows the relationship between the Strouhal number (St) and the Reynolds number (Re).
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Figure II)
In the flat part of St.=0.17 in the curve table, the frequency of the vortex release is proportional to the flow rate, which is the measurement range of the vortex flow sensor. As long as the frequency f is detected, the flow rate of the fluid in the tube can be obtained, and the volume flow rate can be obtained from the flow rate V. The ratio of the measured number of pulses to the volume is called the meter constant (K), see equation (2)
K=3600f/Q(1/m3) Formula (2)
Where: K = meter constant (m-3).
f = number of pulses
Q = volume flow (m3)
So it seems that the working principle of this steam flow meter we all know, in the future procurement process can be better to help you group selection, steam flow meter AK-LUGB this, excellent quality, high precision. Won the reputation of market consumers.
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