BRADFORD SIMS - CHOKING PRESSURE RATIO GUIDELINES FOR SMALL CFVS

Bradford W. Sims, Michael S. Carter, Charles L. Britton, Robert J. McKee,

Abstract

The ratio of maximum exit static pressure to inlet stagnation pressure that maintains sonic velocity at the throat of a Critical Flow Venturi (CFV) is referred to as the Maximum Back Pressure Ratio (MBPR). Current standards only provide MBPR equations for CFVs operated at throat Reynolds Numbers (Rent) above 200,000. This paper will provide MBPR guidelines for operating CFVs below a Rent of 200,000. Additionally this paper will examine the causes of "premature unchoking" and how diffuser geometry contributes to this effect.

Keywords

sonic, CFVN, Maximum Back Pressure Ratio, MBPR, premature unchoking

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IMEKO-TC9-2013-075.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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