Vortex flowmeter operating condition flow rate

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1. Will there be fluctuations during the blowing process of liquid flow using a vortex flowmeter?

Vortex flowmeters used for liquid flow measurement will inevitably experience fluctuations in flow readings during the blowing process, and the amplitude and frequency of the fluctuations are directly related to the pressure, flow rate, and residual impurities in the pipeline of the blowing airflow..

1. Core causes of fluctuations (1) Fluid working conditions deviating from normal production state 1 The vortex flowmeter calculates the flow rate by detecting the frequency of vortex shedding generated when the fluid passes through the vortex generator. Normally, when measuring liquids, the fluid is a continuous and stable flow, and the law of vortex shedding is fixed. When blowing, compressed air or nitrogen is generally used. The flow rate of the sliding airflow will quickly increase from low to the design value, and the supply pressure often fluctuates. The frequency of vortex shedding changes in real time with the flow rate, and the displayed value naturally fluctuates. 2. The blowing airflow will also carry residual condensate, rust slag, and welding slag in the pipeline, which will disrupt the stable generation of vortices and further amplify the fluctuation amplitude. （2） Intermittent characteristics of blowing operation 1 On site blowing mostly adopts the method of intermittent valve opening and closing, and the airflow for a single blow flows in a pulse like manner. The flowmeter reading will show intermittent peaks and drops with the interruption of air flow, forming regular fluctuations.

2. Actual Explanation of Fluctuations 1 If a stabilizing tank and a precision throttle valve are inst

2. How to convert the operating flow rate and standard flow rate of a vortex flowmeter? Firstly, you need to know what is the operating condition flow rate and what is the standard condition flow rate. The flow rate of a gas at an atmospheric pressure of 20 degrees Celsius (sometimes using 0 degrees Celsius as the standard condition) is usually considered as the standard flow rate. Because gases can be compressed, gases with the same standard flow rate have different volumes at different pressures and temperatures in a closed pipeline. The higher the pressure, the smaller the volume, and the smaller the volume flow rate. The flow rate of a gas with pressure (relative to one atmosphere) at a certain temperature is usually called the operating flow rate. The gas temperature and pressure compensation formula can be used to convert the operating flow rate to the standard flow rate. Standard condition flow rate=k * operating condition flow rate * P * 293.15/(t+273.15), where k is the compression coefficient, gas below 5MPa is approximately equal to 1P absolute pressure, and the unit kilogram force per square centimeter is t Celsius. From the formula, it can be seen that a

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