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Wall Pressure Measurements Beneath the Supersonic Jets in an Abruptly Augmented Nozzle

Bashir, Musavir and Khan, Sher Afghan and Choudhary, Zakir Ilahi and Shinde, V. S. (2020) Wall Pressure Measurements Beneath the Supersonic Jets in an Abruptly Augmented Nozzle. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 66 (2). pp. 20-31. ISSN 2289-7879

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Abstract

The ballistic research has introduced the requirements for obtaining aerodynamic data including base and wall pressures over a very wide range of Mach number, Reynolds number, and manipulation of these forces by applying both active and passive control strategies. The manipulation of base and wall pressure plays a significant role in bluff body aerodynamics and control of aerodynamic forces is essential in the reduction of drag and improving the overall performance of such bodies. In this study, an experimental investigation was conducted in sudden expansion axis-symmetric passage for controlling wall pressure. Micro jets constituting four micro-holes around base and symmetric to nozzle axis are used as active control to manipulate the wall pressure. Wall pressure distribution is depicted for Mach numbers 1.25 and 1.3 respectively. Length-to-diameter (L/D) ratios of current investigation range from 10 to 5 with area ratios of 2.56. It is found that wall pressure is highly impacted by the microjet flow control at certain Mach numbers and geometrical parameters like the area ratio and L/D ratio also play a significant role in flow control and 50 % to 60% increase in the wall pressure is found at L/D = 10. It is also shown that the nozzle pressure ratio (NPR) also influences the wall pressure. However, the wall pressure distribution of the ducts is found fluctuating in nature in case of correctly expanded flows and remains ineffective even with microjet control.

Item Type: Article (Journal)
Additional Information: 7395/79456
Uncontrolled Keywords: aerodynamic data : axis-symmetric ; Supersonic JetsBase pressure; wall pressure; flow control; nozzle pressure ratio; microjets
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL780 Rockets
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof. Dr. Sher Afghan Khan
Date Deposited: 19 Mar 2020 12:01
Last Modified: 19 Mar 2020 12:02
URI: http://irep.iium.edu.my/id/eprint/79456

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