Factors Influencing The Standard Orifice Flowmeter Metering Accuracy Of Quantitative Analysis

The standard orifice flowmeter accounts for about50%of the entire trade measurement. The reason is that the structure of the standard orifice plate flow meter is simple, easy to operate, the technology is mature, stable performance and do not need calibration. These advantages make the standard orifice flowmeter has been widely used in the measurement of the gas pipeline. it is also widely used in gas enterprises, improve the measurement accuracy of the standard orifice flowmeter, control of gas input differential can bring huge economic benefits to the gas company.This subject in this context, carrying out the flow field simulation and analysis for the standard orifice flowmeter by fluent6.3. quantitative analysis of the accuracy of its measurement accuracy, Hope to provide some guidance and practical role is to improve the accuracy of orifice flowmeter.Proceed mainly from the aspects of the flow rate, the structural factors of the orifice itself, as well as installation conditions on the discharge coefficient of orifice flowmeter. Using computational fluid dynamics FLUENT simulation software to carry out a numerical simulation study on orifice flowmeter in the case of different velocity, For example,5m/s,10m/s,15m/s, and20m/s, under the premise of100mm caliber Equivalent diameter ratio β=0.4. Impact on orifice meter performance was simulated, For the change of edge of the orifice at right angles to the entrance,orifice diameter and orifice plate thickness.The research results obtained in this article are as follows:(1) When the flow rate of20m/s, the relative error of the discharge coefficient is a bit large, so as far as possible the flow rate limit below this value;(2) When the arc of the edge of the orifice at right angles to the entrance r> lmm Δ C/C relative error rapidly larger, Overhaul the orifice, the orifice plate at right angles to the entrance edge of the wear and tear is large, it should in a timely manner on the orifice plate to be replaced, otherwise can not guarantee the accuracy of the measurement of the orifice flowmeter;(3) when β=0.7, the relative error of the discharge coefficient is has been great, a great influence on the measurement accuracy of the orifice flowmeter;(4) When the orifice plate thickness E beyond5mm, the relative error of is relatively large;...