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In its measurement range, the volume flow rate of vortex street is not affected by changes in the properties of fluid temperature, pressure, density, viscosity, composition, etc., and therefore is accurate without any need for temperature and pressure compensation. However, when measuring steam flow in engineering, it is customary to measure with mass flow.
The steam density is directly affected by the steam working conditions such as temperature, pressure, etc. For example, the steam temperature is 190°C. When the pressure rises from 1.1MPa to 1.2MPa, the density increases by about 10%. It can be seen that the steam properties change or When operating conditions fluctuate, there will be some additional error.
Therefore, the temperature and pressure must be detected at the same time as the volume flow detection, that is, the P and P are compensated in real time to eliminate the additional error of the system and ensure the accuracy of the final required test result, that is, the mass flow, and these compensation operations are performed. Work is done automatically in the flow totalizer. Therefore, when using a vortex flowmeter to measure steam flow, temperature and pressure compensation is necessary.
The insufficiency of vortex flow is mainly due to the fact that the distribution of fluid velocity and pulsation flow will affect the accuracy of measurement. However, after the vortex generator is contaminated, it will also bring errors to the measurement results. These need to be further improved.
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