Flow field disturbance impactultrasonic gas meter measurement
The measurement performance of a G16 ultrasonic gas meter from a certain manufacturer was tested,and the difference between the large flow error and the factory average was 1.62％.Analyze the reasons for the disqualification,and based on the measurement principle of ultrasonic gas meters,calcu-late using two parameters:line average flow rate and surface average flow rate.In this paper,the force analysis of laminar fluid with stable horizontal motion in the pipeline is carried out,and the velocity dis-tribution and their relationship are calculated.At the same time,the analysis of laminar fluid in bending motion shows that its velocity distribution is different from that of straight pipes.If the flow field disturb-ance is not considered for optimization design,calculating according to the horizontal straight pipe flow field will result in significant errors.By installing straight pipe sections with a diameter of 5 times the inlet and outlet of the gas meter,and then testing,the difference between the large flow error and the factory average is only 0.07％,which verifies the above analysis conclusion.Flow field disturbance,as an im-portant factor affecting its metrological performance,requires special attention in product development and design verification.
gas metermetrological performanceflow field disturbanceaverage flow ratestraight pipe flow fieldbend flow field
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