管内差圧を利用した非定常流量測定法における測定精度の検討

概要

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A real-time method of measuring an unsteady flow rate employing differential pressure in a pipe has been presented by the authors. In this measurement method, a distance between two points measuring a differential pressure is shown to have great influence on the measurement accuracy of an unsteady flow rate. This paper clarifies a standard for designing the measurement distance of a differential pressure. Relations between a true pressure gradient and an approximated pressure gradient using the differential pressure are presented. From investigations in frequency domain, very simple inequalities on a measuring distance, which assure an accuracy of measurement, are derived. The standard of a measurement distance is examined by numerical simulations for high-frequency oscillatory flow. The results of this study are very useful for practical applications of the real-time method of measuring unsteady flow rate in a pipe.
社団法人日本機械学会の論文
1988-07-25