Effect of Area Ratio on Base Pressure and Control Effectiveness
Fharukh Ahmed G. M.1, Sher Afghan Khan2
1Fharukh Ahmed G. M., Reaersch Scholar, Department of Mechanical Engineering, Bearys Institute of Technology, Mangalore (Karnataka), India
2Sher Afghan Khan, Department of Mechanical Engineering, Bearys Institute of Technology, Mangalore (Karnataka), India
Manuscript received on 21 July 2019 | Revised Manuscript received on 03 August 2019 | Manuscript Published on 10 August 2019 | PP: 953-958 | Volume-8 Issue-2S3 July 2019 | Retrieval Number: B11790782S319/2019©BEIESP | DOI: 10.35940/ijrte.B1179.0782S319
Open Access | Editorial and Publishing 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 (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: Reducing the base drag and increasing the base pressure from aerodynamic devices involving suddenly expanded flows is of vital importance due to the higher rate of drag associated with them. The experimental effort put into understanding the variation in base pressure using active control of suddenly expanded flows employing microjets is reported in this article. The effect of tiny jets and nozzle pressure ratio (NPR), and length to diameter (L/D) ratio on the percentage change in base pressure is investigated at supersonic Mach numbers at 1.7, 2.3, and 2.7, for area ratios of 2.56, 5.06, and 7.56. Apart from NPR, the L/D ratio has an influential role in percentage change in base pressure at different Mach numbers. An improvement of up to 360 % in base pressure is obtained with the use of sonic micro jets at a particular Mach number and L/D ratio.
Keywords: Active Control, Microjets, Mach Number, Expanded Flows, Area Ratio.
Scope of the Article: Quality Control