Investigation of the Effects of Nozzle Exit Mach Number and Nozzle Pressure Ratio on Axisymmetric Flow Through Suddenly Expanded Nozzles
Sher Afghan Khan1, M. Mohiuddin2, Ahmad Saleel C.3, Fharukh G. M.4

1Sher Afghan Khan, Department of Mechanical Engineering, International Islamic University Malaysia.
2M. Mohiuddin, Department of Mechanical Engineering, International Islamic University Malaysia.
3Ahmad Saleel C., Department of Mech. Engineering, King Khalid University, Abha, Saudi Arabia.
4Fharukh G. M., Research Scholar Department of Mechanical Engineering, Bearys Institute of Technology, Mangalore, Karnataka, India. and Assistant Professor Department of Mechanical Engineering, Government Engineering College, Huvinahadagali (Karnataka), India.

Manuscript received on 18 February 2019 | Revised Manuscript received on 27 February 2019 | Manuscript published on 28 February 2019 | PP: 570-578 | Volume-8 Issue-3, February 2019 | Retrieval Number: C5986028319/19©BEIESP
Open Access | Ethics and Policies | Cite | Mendeley | Indexing and Abstracting
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (

Abstract: Computational Fluid Dynamics simulations were carried out using ANSYS FLUENT for suddenly expanded flow through the convergent-divergent nozzle and a suddenly expanded duct. The Length-to-Diameter ratio of 10 for the duct was used in the analysis. Also, an Area Ratio between CD Nozzle exit area and Duct Area was used to be 1.6. The effects of Nozzle Exit Mach number and the Nozzle Pressure Ratios were evaluated by conducting the simulations for Nozzle Exit Mach numbers: 1.87, 2.25 and 2.58. For each Mach number then, Nozzle Pressure Ratios of 3, 5, 7, 9, and 11 were set respectively. Making a total of 15 cases. All the cases were simulated using the k-ω turbulence model. Simulated results agree with the experimental data. From the analysis, it is clear that the Nozzle Exit Mach number and Nozzle Pressure Ratio have a direct effect on the expanded flow exiting the nozzle.
Keywords: Base Pressure; Wall Pressure; Flow Characteristics; Nozzle Pressure Ratio.

Scope of the Article: Mechanical Design