Journal of Applied Science and Engineering

Published by Tamkang University Press


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Md. Mahbubur RahmanThis email address is being protected from spambots. You need JavaScript enabled to view it., Ved Prakash, Sunil Chandel, and D. G. Thakur

Department of Mechanical Engineering, Defence Institute of Advanced Technology (DU), Girinagar, Pune - 411025, India


Received: July 8, 2023
Accepted: November 24, 2023
Publication Date: December 29, 2023

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

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In the present study, a 3-D analysis of the aerodynamic coefficients of the ejection seat system is performed using Computational Fluid Dynamics (CFD) software ANSYS-Fluent. For this investigation, an unstructured grid of polyhedral cells is created. The Reynolds Averaged Navier-Stokes (RANS) equations are solved with the standard k − ε turbulence model to calculate the aerodynamic coefficients. Before this analysis, a simple blunt bodylike sphere is analyzed to understand the physics and the boundary conditions suitable for external flow aerodynamics at subsonic speed.The drag coefficient (Cd) on the sphere is calculated and matched with the experimental results at Mach number (Ma) = 0.6, 0.46, and 0.33 . Later on, for validation purposes, the analysis of the ejection seat system is performed at Ma = 0.6. Finally, the aerodynamic coefficients are measured for angle of attack (α) = −75, −60, −45, −30, −15, 0, 15, 30, 45, 60, and 75 at Ma = 0.7 and yaw angle (β) = 0 . It is observed that with the increase of α the magnitude of the axial force coefficient (Cx) is increasing up to α = −15 and after that, it decreases with the increase of α. The normal force coefficient (Cz) is decreasing with the increase of α and at α = −75 , the maximum value of the Cz is found. The minimum value of the pitching moment coefficient (Cm) is found at α = 0, whereas the value of the Cm increases as the α changes from 0.


Keywords: Blunt body; sphere; ejection seat system; aerodynamic coefficients; Mach number; angle of attack

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