Passive Control of Base Pressure and the Flow Development in a Duct with Sudden Expansion at Sonic Mach Number

Nur Husnina  Muhamad Zuraidi; Sher Afghan Khan; Mohd Azan  Mohammed Sapardi; Saurav  Dixit

doi:10.37934/arfmts.123.2.111139

Authors

Nur Husnina Muhamad Zuraidi Department of Mechanical Engineering, Kulliyyah of Engineering, International Islamic University Malaysia, Malaysia
Sher Afghan Khan Department of Mechanical Engineering, Kulliyyah of Engineering, International Islamic University Malaysia, Malaysia
Mohd Azan Mohammed Sapardi Department of Mechanical Engineering, Kulliyyah of Engineering, International Islamic University Malaysia, Malaysia
Saurav Dixit Lovely Professional University, Phagwara, Punjab, India

DOI:

https://doi.org/10.37934/arfmts.123.2.111139

Keywords:

Base pressure, passive control, Computational Fluid Dynamics (CFD)

Abstract

The primary purpose of this research is to investigate the effectiveness of rib as a passive control to control the flow development around the circular duct at different levels of expansion using Computational Fluid Dynamics (CFD). The nozzle pressure ratio (NPR), rib size, and rib orientation were considered in this research. The L/D ratio is from 3 to 5; the simulated NPRs were 1.5, 2, 3, 4, and 5. The rib was designed with a quarter circular shape to see the method's effectiveness. The focus was on the duct’s base pressure and wall pressure. The results show that the rib size and orientation strongly influenced the base pressure. The base pressure for the model with rib keeps increasing while the base pressure for the model with plain duct shows opposite results as the NPR increases. The base wall's pressure was not affected by nozzle pressure ratio only. Still, other characteristics, such as rib size and orientation, are significant in manipulating the result. However, the rib does not adversely impact the flow in the duct.