Numerical Simulation of Suddenly Expanded Flow at Mach 2.2
Abdul Aabid1, Ambareen khan2, Nurul Musfirah. Mazlan3, Mohd Azmi. Ismail4, Mohammad Nishat Akhtar5, S. A. Khan6
1Abdul Aabid Department of Mechanical Engineering, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, Malaysia.
2Ambareen khan, Department of Aerospace Engineering, University Sains Malaysia, Nibong Tebal, Penang, Malaysia.
3Nurul Musfirah. Mazlan, Department of Aerospace Engineering, University Sains Malaysia, Nibong Tebal, Penang, Malaysia.
4Mohd Azmi. Ismail, Department of Mechanical Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal, Penang, 14300, Malaysia
5Mohammad Nishat Akhtar, Department of Aerospace Engineering, University Sains Malaysia, Nibong Tebal, Penang, Malaysia.
6S. A. Khan, Department of Mechanical Engineering, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, Malaysia.
Manuscript received on 18 February 2019 | Revised Manuscript received on 27 February 2019 | Manuscript published on 28 February 2019 | PP: 457-462 | Volume-8 Issue-3, February 2019 | Retrieval Number: C5973028319/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: A numerical simulation has been performed to investigate the control of base pressure with microjets in a suddenly expanded duct. Microjets placed at the pitch circle diameter (PCD) of 13 mm, two micro jets of 1 mm orifice diameter located at 900 for active control. The flow Mach number of the investigation was M = 2.2, the L/D ratio of the enlarged duct considered is 6, and the area ratio is 3.24. The convergent-divergent (CD) nozzle geometry has been modeled and simulated employing K-ε turbulence model for standard wall function. From the code independently was checked with the commercial computational fluid dynamics software. The numerical simulations carried for nozzle pressure ratio’s (NPR) 3, 5, 7, 9 and 11. From the present numerical investigation, it is observed that the NPR, Mach number, and area ratio plays a vital role in fixing the base pressure values. NPR’s of the present study is such that the flow mostly remained over expanded. Despite jets being over-expanded the control is effective in decreasing the base suction and hence the base drag.
Keywords: M = 2.2, 3.24. 3, 5, 7, 9 and 11. NPR, Mach Number
Scope of the Article: Cryptography and Applied Mathematics