Flow meter
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Teachers, there is usually a necking area before and after the flow meter. What is the specific reason for this?
It is to ensure that the fluid flow rate meets the requirements for the flow meter to function properly
Not necessarily; certain types of flowmeters require the same diameter as the pipes before and after them (such as turbine flowmeters and ultrasonic flowmeters). The reduction in diameter is taken into account to ensure that the flow meter itself reaches a certain flow velocity in order to perform measurement. It is also possible that the current pipeline flow rate is low, and it is used as a reference measurement. I have been working in the field of volume and energy measurement for petroleum and natural gas for many years, and I have some experience with various types of flowmeters. Feel free to reach out if you need any information.
Generally, a flow meter requires a full pipe to provide accurate measurements.