Reasons for Fluctuations in Vortex Flowmeters

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What are the reasons for inaccurate measurement of vortex flowmeters?

The principle of inaccurate measurement of vortex street flowmeter may have the following factors

1. The selection of vortex street flowmeter is generally based on one diameter and one flow range. Therefore, when choosing a vortex street flowmeter, accurate and reliable parameters must be provided in order to select a suitable diameter vortex street flowmeter.

. If the diameter of the vortex street and the pipeline cannot match the stove god, it is recommended to use a variable diameter method to solve the problem.

2、 In the case of flow fluctuations, the flowmeter may experience large fluctuations during measurement. Firstly, when installing the vortex flowmeter, it is necessary to ensure that the installation method is correct in order to ensure the stability of flow measurement.

3、 The influence of accumulation on the upstream surface of the vortex generator in a vortex flowmeter. If there are viscous particles in the measured fluid, they may gradually accumulate on the upstream surface of the vortex generator, causing changes in its geometric shape and scale, and therefore the flow coefficient will also change accordingly. Therefore, attention should be paid to this in application.

2. Will there be data fluctuations when using a vortex flowmeter to measure liquid flow during purging?

When using a vortex flowmeter to measure liquid flow during purging, there is a high probability that data fluctuations will occur. The amplitude and duration of the fluctuations are directly related to the purging pressure, gas-liquid mixing ratio, and flow field stability.

1. Core reasons for fluctuations

Reasons for Fluctuations in Vortex Flowmeters

1 Flow field is directly interfered: The measurement principle of vortex flowmeter is based on the linear relationship between vortex shedding frequency and flow velocity in a stable single-phase flow field. During blowing, high-speed airflow will destroy the original laminar or stable turbulent state of the liquid, forming a turbulent flow field in the vortex shedding area, resulting in irregular changes in vortex shedding frequency and directly outputting fluctuating flow data. 2. Mismatch of two-phase flow conditions: Compressed air is mixed into the process liquid during blowing, forming gas-liquid two-phase flow, while the calibration parameters of vortex flowmeter are only suitable for single-phase liquid conditions. The flow resistance and vortex generation conditions of two-phase flow are significantly different from those of single-phase liquid, and the flowmeter cannot accurately match the working conditions, inevitably resulting in reading fluctuations. 3 Abnormal amplification of blowing pressure fluctuations: If the blowing gas source pressure is unstable, it will cause the gas-liquid mixing ratio to change constantly, further exacerbating the turbulence of the flow field and amplifying the amplitude of data fluctuations.

2. Fluctuations in Different Blowing Scenarios 1 Offline blowing (blowing after removing the flow meter): At this time, the flow meter is separated from the process pipeline, and the blowing airflow directly passes through the inside of the flow meter, causing more direct flow interference and more severe data fluctuations, even resulting in range jumps.

2. Online pressurized blowing: If the blowing pressure is strictly controlled slightly higher than the process liquid pressur

What are the reasons for inaccurate measurement of vortex flowmeters?

2. Will there be data fluctuations when using a vortex flowmeter to measure liquid flow during purging?

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