BOUNDARY LAYER TRANSITION IN HIGH PRECISION CRITICAL NOZZLES OF VARIOUS SHAPES

Masahiro Ishibashi, Tatsuya Funaki

Abstract

Calibration results of accurately machined critical flow Venturi nozzles are summarized and a single fitted curve of the discharge coefficient against the Reynolds number were obtained that covers from the laminar to the turbulent boundary layer regimes. Possibility to use critical flow Venturi nozzles with smaller inlet curvature such as <i>R</i> = 1.0 D is discussed. Effects of diffuser length, inlet curvature, inlet diameter and inlet shape are also discussed. It is shown that theories will fail to predict discharge coefficient correctly when <i>R</i> is small.

Keywords

CFVN, sonic nozzles, shapes

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IMEKO-TC9-2013-074.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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