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示踪气体在管道内的混合均匀性,对示踪法测量气体流量的准确性或者在线校准管道气体流量计的校准精度影响很大.在直径为300mm的90°弯曲管道内,对示踪气体CO与空气的混合情况进行了数值模拟研究,并与实验结果进行了对比分析.结果表明,五孔释放混合效果明显要好于单孔释放,且五孔释放时弯管下游9D处示踪气体与空气混合基本均匀.数值模拟结果和实测结果基本吻合,可为示踪法测量气体流量和在线校准管道气体流量计提供参考.
The homogeneity of the tracer gas in the pipe has a great influence on the accuracy of the tracer method for measuring the gas flow rate or on the calibration accuracy of the on-line calibrated pipe gas meter. In a 90 ° curved pipe with a diameter of 300 mm, CO and air were simulated and compared with the experimental results.The results showed that the release effect of five holes was obviously better than that of single hole.The release of tracer gas at 9D downstream of the bend Air mixing is basically uniform.The numerical simulation results are basically in line with the measured results, which can be used as a reference for tracer gas flow measurement and on-line calibration of pipeline gas flowmeter.