Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers
This study aims to assess the effect of rib size, shape, and location in a suddenly expanded flow at sonic Mach number. Flow from a converging nozzle is exhausted into a larger area of duct diameter of 18 mm. The geometric parameters considered are the area ratio, duct length, rib radius, and inerti...
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Elsevier
2024-11-01
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| Series: | International Journal of Thermofluids |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202724003483 |
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| author | Ambareen Khan Abdul Aabid Sher Afghan Khan Mohammad Nishat Akhtar Muneer Baig |
| author_facet | Ambareen Khan Abdul Aabid Sher Afghan Khan Mohammad Nishat Akhtar Muneer Baig |
| author_sort | Ambareen Khan |
| collection | DOAJ |
| description | This study aims to assess the effect of rib size, shape, and location in a suddenly expanded flow at sonic Mach number. Flow from a converging nozzle is exhausted into a larger area of duct diameter of 18 mm. The geometric parameters considered are the area ratio, duct length, rib radius, and inertia parameters, which are considered the level of expansion at critical Mach number. In the present study, duct lengths were from 1D to 6D, rib radii considered were 1 mm to 3 mm, and rib locations were 0.5D, 1D, 1.5D, 2D, and 3D. Results show that when the ribs are placed near the reattachment point with a 3 mm radius, they are efficient and capable of reducing the suction in the recirculation zone and the base pressure, which was lower than the ambient pressure in the absence of ribs, is assorted larger than the back pressure. If the requirement is to equate the pressure at the base to ambient pressure, then a 2 mm radius is the right choice. Furthermore, the 1 mm rib cannot reduce the suction in the base region, and base pressure remains sub-atmospheric for the entire range of rib locations, as well as the NPRs of the present study. When the orientation of the ribs is changed, and the flow interacts with the flat surface instead of the curved surface, there is a marginal change in the flow pattern, and there is no significant change in the base pressure values. |
| format | Article |
| id | doaj-art-c70514184a814c5cb5e204c914994c8d |
| institution | Kabale University |
| issn | 2666-2027 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | International Journal of Thermofluids |
| spelling | doaj-art-c70514184a814c5cb5e204c914994c8d2024-12-13T11:04:18ZengElsevierInternational Journal of Thermofluids2666-20272024-11-0124100908Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbersAmbareen Khan0Abdul Aabid1Sher Afghan Khan2Mohammad Nishat Akhtar3Muneer Baig4School of Aerospace Engineering, Universiti Sains Malaysia, Penang, MalaysiaDepartment of Engineering Management, College of Engineering, Prince Sultan University, PO BOX 66833, Riyadh 11586, Saudi Arabia; Corresponding author.Department of Mechanical and Aerospace Engineering, Faculty of Engineering, International Islamic University Malaysia, Kuala Lumpur, MalaysiaSchool of Aerospace Engineering, Universiti Sains Malaysia, Penang, MalaysiaDepartment of Engineering Management, College of Engineering, Prince Sultan University, PO BOX 66833, Riyadh 11586, Saudi ArabiaThis study aims to assess the effect of rib size, shape, and location in a suddenly expanded flow at sonic Mach number. Flow from a converging nozzle is exhausted into a larger area of duct diameter of 18 mm. The geometric parameters considered are the area ratio, duct length, rib radius, and inertia parameters, which are considered the level of expansion at critical Mach number. In the present study, duct lengths were from 1D to 6D, rib radii considered were 1 mm to 3 mm, and rib locations were 0.5D, 1D, 1.5D, 2D, and 3D. Results show that when the ribs are placed near the reattachment point with a 3 mm radius, they are efficient and capable of reducing the suction in the recirculation zone and the base pressure, which was lower than the ambient pressure in the absence of ribs, is assorted larger than the back pressure. If the requirement is to equate the pressure at the base to ambient pressure, then a 2 mm radius is the right choice. Furthermore, the 1 mm rib cannot reduce the suction in the base region, and base pressure remains sub-atmospheric for the entire range of rib locations, as well as the NPRs of the present study. When the orientation of the ribs is changed, and the flow interacts with the flat surface instead of the curved surface, there is a marginal change in the flow pattern, and there is no significant change in the base pressure values.http://www.sciencedirect.com/science/article/pii/S2666202724003483CD nozzleRibsBase pressureComputational fluid dynamicsHigh-speed flow control |
| spellingShingle | Ambareen Khan Abdul Aabid Sher Afghan Khan Mohammad Nishat Akhtar Muneer Baig Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers International Journal of Thermofluids CD nozzle Ribs Base pressure Computational fluid dynamics High-speed flow control |
| title | Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers |
| title_full | Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers |
| title_fullStr | Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers |
| title_full_unstemmed | Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers |
| title_short | Comprehensive CFD analysis of base pressure control using quarter ribs in sudden expansion duct at sonic Mach numbers |
| title_sort | comprehensive cfd analysis of base pressure control using quarter ribs in sudden expansion duct at sonic mach numbers |
| topic | CD nozzle Ribs Base pressure Computational fluid dynamics High-speed flow control |
| url | http://www.sciencedirect.com/science/article/pii/S2666202724003483 |
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