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本文分析了探头式电磁流量计的基本原理。根据电磁学和流体力学的理论求得了圆柱二电极、圆柱四电极、椭圆柱以及流线型柱体探头感应电动势的解析解。文中还讨论了边界层绕流圆柱探头和有限区间对探头输出信号的影响。从理论解可以看出,探头电极间的感应电动势与来流速度之间呈明显的线性关系。此外,文中还推荐了几种延迟或避免探头表面发生边界层分离的方法。对于圆柱和椭圆柱样机的实验证实了理论分析的结果。
This paper analyzes the basic principle of the probe-type electromagnetic flowmeter. According to the theory of electromagnetics and fluid mechanics, the analytic solutions of the induced electromotive force of cylindrical two-electrode, cylindrical four-electrode, elliptic column and streamline cylindrical probe are obtained. The paper also discusses the influence of the boundary layer flow around the cylindrical probe and the finite interval on the probe output signal. It can be seen from the theoretical solution that there is an obvious linear relationship between the induced electromotive force and the incoming velocity of the probe electrode. In addition, several methods to delay or avoid boundary layer separation on the probe surface are also recommended. Experiments on cylindrical and elliptical prototypes confirm the theoretical analysis results.