A Drag Plate Flowmeter for Pulsating Flow

Abstract

A survey of recent articles shows that drag plate flowmeters, in one form or another, have been about the most popular devices for indicating transient flows. Design principles are given and features discussed, which affect performance in transient or pulsating flow. Where a transient flowmeter has an electrical output it is quîte easy to process the output signal so as to obtain the average flow under pulsating conditions of flow. Thus the drag plate flowmeter is of interest for this important application. Up to the present the transient performance of these flowmeters has been inferred from the examination of the output waveform and from the comparison of the indicated flow with true average flow under pulsating conditions. Details of frequency analysis tests of a drag flowmeter are given.