Study of Effect of Convergence Section Geometric on the Performance of a Sonic Nozzle

Kassem, F. A.; Zahran, A. A.; Adel, M.

doi:10.47176/jafm.18.7.3294

Study of Effect of Convergence Section Geometric on the Performance of a Sonic Nozzle

Document Type : Regular Article

Authors

¹ Volume and Fluid Flow Metrology Laboratory, Mass and Force Division, National Institute of Standards (NIS), Giza 12211, Egypt

² Mechanical Power Engineering Department, Faculty of Engineering, Zagazig University, Zagazig 44519, Egypt

10.47176/jafm.18.7.3294

Abstract

Critical flow Venturi nozzles (toroidal, cylindrical, convergent–divergent, or C–D) nozzles) have discharge coefficients predicted through numerical and experimental investigations. Unfortunately, the imprecision of the critical-flow Venturi nozzle design makes it impossible to study the influence of inlet curvature R_c on the discharge coefficient in the laminar boundary layer area. This study examines how the inlet curvature affects the discharge coefficient, or C_d, in the laminar boundary layer area of a critical-flow Venturi nozzle with a cylindrical throat and toroidal shape. The inlet curvature has a range from one throat diameter to three and a half throat diameters. This range of inlet curvatures was obtained by throat the inlet of a high-precision nozzle that was primarily compliant with ISO 9300. The C-D nozzle showed the impact of the convergence angle on the discharge coefficient. The results showed that the highest discharge coefficient occurs at R_c= 2d_th for a throat diameter of 0.5588 mm, whereas for d_th= 3.175 mm, it occurs at R_c= 2.5d_th for toroidal nozzle. For this C-D nozzle, the highest discharge coefficient was observed to occur at a curvature of angle of 10°. Moreover, C_d increases significantly with increase of inlet stagnation pressure but with a small throat diameter.

Keywords

Main Subjects

Computational Fluid Dynamics

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