EFFECTS OF VARIOUS GEOMETRIC PARAMETERS ON FLOW BEHAVIOR IN SONIC NOZZLES

E. von Lavante, A. Zachcial, D. Zeitz, B. Nath, H. Dietrich

Abstract

Numerical analysis of flow fields associated with sonic Venturi nozzles with various modifications of its basic geometry was carried out. The baseline nozzle, used for gas flow metering, was simulated at Reynolds number 1.5 &times; 10⁵. The modifications included a backward facing step in the nozzle wall just after the throat, suction through the wall and three different diffuser opening angles. The flow was simulated using compressible viscous flow solver ACHIEVE developed by the authors. ln some cases, a noticable improvement in the flowrate and, consequently, increase in the discharge coefficient <i>C</i>_d was achieved.

Keywords

critical nozzles, discharge coefficient, numerical simulation, boundary layer control, boundary layer suction

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IMEKO TC

TC9 - Flow Measurement

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