A Theoretical Method of Determining Discharge Coefficients for Venturis Operating at Critical Flow Conditions

Abstract

A venturi designed to operate at critical flow conditions and to provide accurate measurement of flow rates of compressible fluids is described. A theoretical method of determining the discharge coefficients for this venturi is presented, and a comparison of the theoretically and experimentally determined coefficients for one venturi is shown (working fluid—air). The values of discharge coefficient were in the range of 0.992 to 0.994, and the theoretically and experimentally determined coefficients agreed within ±0.06 per cent over the range of conditions investigated.