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Title: Flow States of Critical-Flow Venturi Nozzles
Author: Blent nsal Esra Ko
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: Extensive numerical investigations were carried out to characterize critical back pressure ratio (CBPR), instability and boundary layer transition features of Critical Flow Venturi Nozzles (CFVN). For the investigations nozzle diameters were varied from 0.1 to 30 mm and two dimensional, axisymmetric, steady and unsteady calculations were performed over a broad range of back pressure ratios (BPR) which covers Reynolds number (Re) range of 103 to 107. Experiments were also carried out to determine CBPR of five nozzles. The results were summarized in terms of nozzle diameter, boundary layer thickness, Re and BPR. It was also possible to summarize the results in terms of flow maps to show various flow states of CFVNs

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