The Effect Of Divergent Angle On A Convergent-Divergent Nozzle Using CFD

Badrul Hisham, Muhamad Bazli Nabil (2021) The Effect Of Divergent Angle On A Convergent-Divergent Nozzle Using CFD. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The work focuses on the numerical simulation on the fluid performance of converging diverging nozzles through nozzle dimension. In the present work, 3 models of convergent-divergent nozzles with divergent angle of 7º, 13º, and 19º are numerically investigated using a software Ansys Fluid Fluent. Computational work is carried out using a double precision method at the solution in Ansys, two-dimensional modelling, and implicit scheme of linear method. The nozzle has a throat diameter of 0.509 m, convergent length of 0.64 m, and a convergent angle of 21º. The inlet boundary conditions were specified as such the fluid used in this study s ideal gas, mass flow rate of fluid to be 826 kg/s, and atmospheric pressure of 101.325 kPa. The main objectives of this study is to design 3 models of convergent-divergent nozzle with different divergent angles, and to analyze and compare maximum Mach number, exit velocity, pressure drop, and thrust force for the 3 models of convergent-divergent nozzle. Numerical findings show that there are changes in Mach number, exit velocity, pressure drop, and thrust force in 7º, 13º, and 19º models. Model 1 with 7º divergent angle has a maximum Mach number of 2.231, exit velocity of 2287 m/s, pressure drop of 3479.9 kPa, and thrust force of 1889.062 kN. Model 2 with 13º divergent angle has a maximum Mach number of 2.328, exit velocity of 2376 m/s, pressure drop of 3568.6 kPa, and thrust force of 1962.576 kN. Model 3 with 19º divergent angle has a maximum Mach number of 2.376, exit velocity of 2396 m/s, pressure drop of 3590.9 kPa, and thrust force of 1979.096 kN Numerical results show that there is no choking flow that reduces the performance of fluid flow in the nozzles in terms of Mach number, velocity, pressure drop, and thrust force

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