UNCERTAINTY ESTIMATION OF SHOCK TUBE PRESSURE STEPS

Stephen Downes, Andy Knott, Ian Robinson

Abstract

In this paper we describe the work performed at the National Physical Laboratory (NPL) to develop dynamic pressure standards based on shock tube techniques, including the checks carried out to ensure that the ideal gas theory, used to predict step pressure changes, is valid in our circumstances. We go on to consider the major uncertainty contributions to the calculated step pressure, suggest ways to minimise these, and conclude by calculating a target uncertainty for NPL’s new 7.0 MPa steel shock tube.

Keywords

shock tube, dynamic pressure, uncertainty

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IMEKO-WC-2015-TC16-336.pdf

DOI

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IMEKO TC

TC16 - Pressure and Vacuum Measurement

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