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Open Access

ARTICLE

Control of Nozzle Flow Using Rectangular Ribs at Sonic and Supersonic Mach Numbers

Vigneshvaran Sethuraman1, Parvathy Rajendran1,*, Sher Afghan Khan2, Abdul Aabid3, Muneer Baig3
1 School of Aerospace Engineering, Universiti Sains Malaysia, Engineering Campus, Nibong Tebal, Pulau Pinang, 14300, Malaysia
2 Department of Mechanical and Aerospace Engineering, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, 53100, Malaysia
3 Department of Engineering Management, College of Engineering, Prince Sultan University, P.O. Box 66833, Riyadh, 11586, Saudi Arabia
* Corresponding Author: Parvathy Rajendran. Email: email
(This article belongs to the Special Issue: Computational Fluid Dynamics: Two- and Three-dimensional fluid flow analysis over a body using commercial software)

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2024.049441

Received 08 January 2024; Accepted 21 May 2024; Published online 01 July 2024

Abstract

This study deals with base pressure management in a duct for various values of the Mach number (M), namely, Mach number corresponding to sonic and four supersonic conditions. In addition to the Mach number, the nozzle pressure ratio (NPR), the area ratio, the rib dimension, and the duct length are influential parameters. The following specific values are examined at M = 1, 1.36, 1.64, and 2, and NPRs between 1.5 and 10. The base pressure is determined by positioning ribs of varying heights at predetermined intervals throughout the length of the square duct. When the level of expansion is varied, it is seen that the base pressure initially drops for overexpanded flows and increases for under-expanded flows. When ribs are present, the flow field in the duct and pressure inside the duct fluctuate as the base pressure rises. Under-expanded flows can achieve a base pressure value that is suitably high without experiencing excessive changes in the duct flow in terms of static pressure if a rib height around 10% of the duct height close to the nozzle exit is considered. Rectangular rib passive control does not negatively affect the duct’s flow field.

Keywords

Base pressure; internal flows; ribs; suddenly expanded flow; wall pressure

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