Experimental Study of Metering Performance of Porous Orifice Plate Flowmeters
Standard orifice plate flowmeter in the industrial field,there are limitations of the scope of application and measurement accuracy.To adapt to the needs of field working conditions,porous orifice plate flowmeter has been widely used.According to the basic measurement principle of the standard orifice plate,the flow equation of the porous orifice plate is derived,and the linearity error and the outflow coefficient is introduced as an important characterization index for evaluating the metrological accuracy of the porous orifice plate.To study the influence of the structural parameters of the porous orifice plate and the pressure-taking method on the metering performance,test programs with different structural parameters and pressure-taking positions are designed respectively,and a flow test calibration platform is built to carry out the real-flow calibration test.The test results show that the method of reducing the throttle orifice index ratio and mid span pickup pressure of the porous orifice plate flowmeter can improve the metering accuracy and stability;throttle orifice outlet set 45° bevel cannot improve the accuracy of measurement,but will lead to a reduction of measurement accuracy when the flow is relatively large.The results of the study can provide reference for the structural design of porous orifice plate flowmeter and its installation and use in related projects.
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