What is the working principle of a compressed air vortex flowmeter?

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1. Will there be fluctuations when the vortex flowmeter for measuring liquid flow is blown?

When the vortex flowmeter is blown without isolation, there is a high probability that there will be fluctuations in the flow signal, and in severe cases, it may even output false flow readings..

1. Core reasons for fluctuations 1 Turbulent changes in flow state: The vortex flowmeter operates based on the Karman vortex principle and only has a stable measurement output for stable single-phase continuous fluids. When blowing the liquid pipeline, the pipeline will quickly switch from a single-phase liquid flow of Zhibi to a two-phase flow of gas-liquid, or even to a pure compressed air flow. Bubbles will interfere with the stable generation and detection of vortex streets, disrupt the signal acquisition logic of the flowmeter, and cause output fluctuations. 2. Sudden changes in medium properties: The flow coefficient of the vortex street flowmeter is calibrated separately for the measured liquid, and the density and viscosity of the compressed air/nitrogen used for blowing are much lower than those of the measured liquid. Even if the flow state is stable, the output of the flowmeter will experience abnormal jumps due to mismatched physical properties, manifested as fluctuations. 3. Unstable flow velocity of the blowing airflow: If there are fluctuations in the pressure of the blowing gas source, the flow velocity of the airflow in the pipeline will continue to fluctuate. The frequency of vortex streets is strongly positively correlated with fluid flow velocity, and flow velocity fluctuations are directly transmitted as fluctuations in flow signals.

2. Practical Methods to Avoid Fluctuations 1 Priority s

hould be given to using bypass blowing to blow through the pipeline, closing the upstream and downstream shut-off valves of the vortex flowmeter, isolating the flowmeter from the blowing airflow, and avoiding signal fluctuations at the root. If bypass blowing cannot be used, most of the liquid in the pipeline should be drained through the drain valve first to reduce the probability of gas-liquid two-phase mixing; At the same time, stabilize the blowing gas source pressure, control the blowing flow rate within the range of the flowmeter, and ensure that the gas source pressure meets the rated pressure requirements of the pipeline to avoid pipeline leakage or deformation. After the blowing is completed, the pipeline needs to be refilled with the measured liquid and left to stand for a period of time until the flow state is stable before resuming normal measurement of the flowmeter.

2. What is the working principle of vortex flowmeter that must be learned for beginners?

The vortex flowmeter is a fluid natural oscillation instrument developed based on the principle of "Karman vortex street". Its core is to calculate the flow rate by detecting the vortex frequency generated by the fluid when it bypasses obstacles.. The following is a detailed explanation of its working principle.

1. Definition of Karman vortex street phenomenon: When a fluid (gas or liquid) passes around a non streamlined obstacle (such as a triangular column or cylinder), two columns of vortices are alternately generated on both sides downstream of the obstacle. The arrangement of vortices is similar to the street lights on both sides of the street, hence it is called "vortex street". Discoverer: This phenomenon was mathematically

1. Will there be fluctuations when the vortex flowmeter for measuring liquid flow is blown?

2. What is the working principle of vortex flowmeter that must be learned for beginners?

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