TY  - EJOU
AU  - Zuraidi, Nur Husnina Muhamad 
AU  - Khan, Sher Afghan 
AU  - Aabid, Abdul 
AU  - Baig, Muneer 
AU  - Shaiq, Istiyaq Mudassir 

TI  - Passive Control of Base Pressure in a Converging-Diverging Nozzle with Area Ratio 2.56 at Mach 1.8
T2  - Fluid Dynamics \& Materials Processing

PY  - 2023
VL  - 19
IS  - 3
SN  - 1555-2578

AB  - In this study, a duct is considered and special attention is paid to a passive method for the control of the base pressure relying on the use of a cavity with a variable aspect ratio. The Mach number considered is 1.8, and the area ratio of the duct is 2.56. In particular, two cavities are examined, their sizes being 3:3 and 6:3. The used L/D spans the interval 1–10 while the NPRs (nozzle pressure ratio) range from 2 to 9. The results show that the control becomes effective once the nozzles are correctly expanded or under-expanded. The pressure contours at different NPR and L/D are presented. It is shown that the NPR and cavity location strongly influence the base pressure. The NPR, Mach number, and cavity aspect ratio have a strong effect on the base pressure in the wake region.
KW  - Base pressure; passive control; computational fluid dynamics (CFD); supersonic; aerodynamics; cavity

DO  - 10.32604/fdmp.2023.023246