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Title: Influence Of Upstream Shape Factors On Discharge Coefficient Of Critical Flow Venturi Nozzles
Author: Ernst Von Lavant Bodo Mickan Harun Kaya Davut Gler
Source: Flomeko 2016
Year Published: 2016
Abstract: The influence of the shape upstream of a throat of critical flow Venturi nozzles on the discharge coefficient in general and the transition of the character of boundary layer from laminar to turbulent in particular has been studied experimentally as well as numerically. Several nozzles of various throat diameters with intake radius of curvature of 2 D and 1 D (D being the throat diameter) have been investigated experimentally by the High Pressure Piston Prover of the Physikalisch - Technische Bundesanstalt (PTB) located in Dorsten, Germany, at pressures up to 50 bar, resulting in Reynolds numbers larger than 2 10 6 . Two of the nozzles consisted of two parts divided axially to allow the visualization of the flow transition. Subsequently, the nozzle geometry was measured at the PTB and calibrated using low pressure air. In parallel effort, the flow field in the nozzles was simulated using different boundary layer treatment. The effect of the nozzle geometry on the transitional behaviour was discussed

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