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Effect of wall roughness changes on ultrasonic gas flowmeters

机译：壁面粗糙度变化对超声波气体流量计的影响

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摘要

A theoretical flow model has been developed to describe accurately a fully developed velocity profile of a gas flow in pipe lines with wall roughness as parameter. The model applies the Colebrook and White skin friction correlation which has been adjusted based on experimental data from Princeton SuperPipe facilities. This has resulted in a flow profile model in line with the latest views. The model has shown a significant flow profile variation for wall roughness changes. An ultrasonic ray propagation model of a single path meter has been developed to study the influence of the mentioned flow profile variations on ultrasonic meters. The model has been applied for various cases with different Reynolds number and wall roughness. The results of the study confirm field data that ultrasonic meters are affected by wall roughness changes. To quantify the effect for multipath ultrasonic meters the flow meter algorithm and path position is required.
机译：已经开发出理论流量模型来准确描述以壁粗糙度为参数的管道中气流的完全展开速度曲线。该模型应用了Colebrook和White皮肤摩擦的相关性，该相关性已根据普林斯顿SuperPipe工厂的实验数据进行了调整。这样就形成了与最新视图一致的流量剖面模型。该模型显示出壁粗糙度变化时明显的流量分布变化。已经开发了单路径流量计的超声波传播模型，以研究上述流量分布变化对超声波流量计的影响。该模型已应用于雷诺数和壁粗糙度不同的各种情况。研究结果证实了现场数据，即超声波仪表受到壁面粗糙度变化的影响。为了量化多径超声流量计的效果，需要使用流量计算法和路径位置。

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