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Title: Choking Pressure Ratio Guidelines For Small Critical Flow Venturis And The Effects Of Diffuser Geometry
Author: Michael S. Carter Bradford W. Sims, Charles L. Britton, Robert J. Mckee
Source: Flomeko 2013
Year Published: 2013
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 ( R e n t ) above 200,000. This paper will provide MBPR guidelines for operating CFVs below a R e n t of 200,000. Additionally this paper will examine the causes of premature unchoking and how diffuser geometry contributes to this effect

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