A Real Time Method of Measuring Unsteady Flow Rate and Velocity Employing Differential Pressure in a Pipe : Fluids Engineering

概要

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This paper presents simplified approximate functions of the transfer functions of pressure gradient, mean flow velocity and centerline velocity in axially symmetrical laminar flow, and a new real time method of measuring unsteady flow rate and velocity by the use of an analog electronic circuit whose transfer characteristic is equivalent to the function. The simplified approximate functions are simple but highly precise, so their equivalent analog electronic circuits can be made easily. The unsteady flow rate and the centerline flow velocity obtained from the measured value of pressure difference in the pipe, by the use of the analog electronic circuit, are in good agreement with the results of numerical calculation and the value measured by LDA. The method presented in this paper makes simple but precise measurements of unsteady flow rate and velocity possible, and is very useful for practical application.
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