Abstract
In order to clarify the measuring error on differential-pressure-type flowmetering under the conditions of compressible flow with pulsation, the effects of fluid compressibility, beta ratio, upstream pipe length, pulsation intensity and Strouhal number on the error have been investigated respectively, by experiment and unsteady compressible flow analysis. The characteristics of the error E with the Strouhal number, St, are plotted indirectly and compactly, by introducing the variation of MR (ratio of mass flow amplitude in an unsteady flow case to that of quasi steady flow case) with St. This curve makes it possible to estimate the error curves qualitatively.
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