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Base pressure control by supersonic micro jets in a suddenly expanded nozzle

Khan, Sher Afghan and Chaudhary, Zakir Ilahi and Shinde, Vilas B. (2018) Base pressure control by supersonic micro jets in a suddenly expanded nozzle. International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS, 18 (4). pp. 101-112. ISSN 2077-124X E-ISSN 2227-2771

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Experimental studies were conducted in sudden expansion axi-symmetric passage for controlling base pressure and their outputs were showcased in current paper. Micro jet active control techniques are used for controlling base pressure. These controls constitute four spaces around base and symmetric to nozzle axis. Mach numbers of the abruptly expanded flows studied for base pressure range from 1.1 to 2.8 and the obtained wall pressure distribution is depicted for Mach number 1.1, 1.5, 2.1, and 2.8 respectively. In this paper the area ratio of the study was 2.56 and the L/D ratios were up to 1 from 10 respectively. Nozzles working on the concerned inertia level were performed with NPR from 3 to 11. It is found that the active controls through the micro jets are capable of regulating the pressure in the recirculation zone. In the presence of favourable pressure gradient the control becomes effective. An appreciable 65% hike in the pressure at the base was accomplished for the above discussed parameters of the current research.

Item Type: Article (Journal)
Additional Information: 7395/66215
Uncontrolled Keywords: Base Pressure; Wall Pressure; Flow Control; Nozzle Pressure Ratio, Micro jets.
Subjects: T Technology > T Technology (General)
T Technology > TL Motor vehicles. Aeronautics. Astronautics
T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL500 Aeronautics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering
Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 13 Sep 2018 10:17
Last Modified: 15 Mar 2019 10:54
URI: http://irep.iium.edu.my/id/eprint/66215

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