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How to understand the working principle of vortex flowmeter
figure vortex flowmeter is one of the condition of flowmeter is commonly used in industry, it is mainly used for measuring gas pipeline and the new type of steam flowmeter, has been gradually replaced the development trend of orifice meter.
We are to the vortex.
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How to understand the working principle of vortex flowmeter figure vortex flowmeter is one of the condition of flowmeter is commonly used in industry, it is mainly used for measuring gas pipeline and the new type of steam flowmeter, has been gradually replaced the development trend of orifice meter.
Then we how much do you know about the working principle of vortex flowmeter?
Today jet instrument we in-depth discussion and research on this issue.
In the flow of the specific conditions, some of the fluid kinetic energy is converted to fluid vibration, the vibration frequency and velocity of flow (
Have a certain proportion relations, based on the principle of work of the flowmeter is called fluid vibration meter.
At present there are three types of fluid vibration meter, vortex flowmeters, the precession (
Flow meter and fluidic flowmeter.
Vortex flow juice (
Hereinafter referred to as VSF)
Set in the fluid vortex occurred (
, from the vortex occurs on both sides of the alternately with the rules of the vortex, the vortex is called the karman vortex street, as shown in figure 1.
Downstream asymmetric vortex column in spiral body is arranged.
Sets the frequency of vortex to f, to flow the average speed of measured medium for U, spiral body right against the face width is d, table body sizes for d, according to the principle of the karman vortex street, has the following equation f = SrU1 / d = SrU/md (
U1 - type
Vortex occurred on both sides of the average flow velocity, m/s;
Spiral body on both sides of the bow area and the ratio of the pipe cross section area of figure 1 karman vortex street and working principle of vortex flowmeter volume flow chart the pipe qv for qv = & PI;
K = f / qv = [
老D2md / 4)
K - type
The instrument coefficient of flow meter, pulse number/m3 (
P / m3)
K in addition to the associated with the geometry size of spiral body, pipeline, also related to strouhal number.
Strouhal number for the dimensionless parameter, it is associated with spiral body shape and Reynolds number, as shown in figure 2 to cylindrical spiral body the strouhal number of diagram with pipe Reynolds number.
The figure shows, ReD = 2 & times;
104 ~ 7报;
106 range, Sr can be regarded as constant, this is the normal work of the instrument.
When measuring gas flow rate, VSF flowmeter formula for (
Figure 2 strouhal number and Reynolds number qVn relation curve type, qV -
Respectively for the standard conditions,
0 oc or 20 oc, 101.
And working conditions of traffic volume, m3 / h.
Pn, P -
Respectively for the standard conditions and conditions of absolute pressure, Pa.
Tn, T -
Respectively under standard state and thermodynamic temperature, in the cases of K;
Respectively and the compressibility of gas under the condition of standard condition.
By visible on type, VSF output pulse frequency of the signal is not affected by fluid physical properties, and composition change, namely the instrument coefficient in only within a certain range of Reynolds number and swirl through the body and the shape size and so on.
But as flow meter need to be detected in the material balance and energy metering mass flow rate, the flow meter should be monitored at the same time the output signal of the volume flow rate and fluid density, fluid property and has a direct influence on flow metering or components.
Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.
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