Passive control of base pressure with static cylinder at supersonic flow
An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder...
| Main Authors: | , , , |
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| Format: | Proceeding Paper |
| Language: | English English |
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Institute of Physics Publishing
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf |
| _version_ | 1848786380306513920 |
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| author | Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin |
| author_facet | Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin |
| author_sort | Asadullah, Mohammed |
| building | IIUM Repository |
| collection | Online Access |
| description | An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder of 2 mm diameter at 2 mm from the side wall of a square duct and 8 mm from the square nozzle exit in the base region is installed as a passive control device. Base pressures in the wake flow after sudden expansion of jets in to a square nozzle have been measured. The length width ratio of the duct is 10. The jets were operated at different nozzle pressure ratios in the range from 2 to 9. The flow field in the square duct was also observed for all cases. Static cylinder as a passive controller was found to reduce the base drag as high as 59 percent at NPR = 9 and 14 percent at NPR = 6. The base pressure depends on Mach number, area ratio, length to width ratio, and nozzle pressure ratio (NPR). When flow from the nozzle is over expanded, the static control is ineffective till NPR is 6. The level of expansion plays a vital role. The flow flux in the square duct remains almost identical with and without control for most of the cases. However, at higher NPRs namely 6, 7.8, and 9 the control results in an increase as well as a decrease in the wall pressure along the duct. Passive control of the base flow is effective for higher NPRs. The flow field for perfectly expanded nozzle is dominated by the shock waves. © Published under licence by IOP Publishing Ltd. |
| first_indexed | 2025-11-14T17:08:07Z |
| format | Proceeding Paper |
| id | iium-65383 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:08:07Z |
| publishDate | 2018 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-653832018-08-03T01:33:41Z http://irep.iium.edu.my/65383/ Passive control of base pressure with static cylinder at supersonic flow Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin TJ241 Machine construction (General) An experimental investigation for over expanded, perfectly expanded and under expanded supersonic jets is presented to study the effectiveness of a static cylinder to reduce base drag at Mach 2 through a converging diverging nozzle for a cross-sectional duct nozzle area ratio of 9. A static cylinder of 2 mm diameter at 2 mm from the side wall of a square duct and 8 mm from the square nozzle exit in the base region is installed as a passive control device. Base pressures in the wake flow after sudden expansion of jets in to a square nozzle have been measured. The length width ratio of the duct is 10. The jets were operated at different nozzle pressure ratios in the range from 2 to 9. The flow field in the square duct was also observed for all cases. Static cylinder as a passive controller was found to reduce the base drag as high as 59 percent at NPR = 9 and 14 percent at NPR = 6. The base pressure depends on Mach number, area ratio, length to width ratio, and nozzle pressure ratio (NPR). When flow from the nozzle is over expanded, the static control is ineffective till NPR is 6. The level of expansion plays a vital role. The flow flux in the square duct remains almost identical with and without control for most of the cases. However, at higher NPRs namely 6, 7.8, and 9 the control results in an increase as well as a decrease in the wall pressure along the duct. Passive control of the base flow is effective for higher NPRs. The flow field for perfectly expanded nozzle is dominated by the shock waves. © Published under licence by IOP Publishing Ltd. Institute of Physics Publishing 2018 Proceeding Paper PeerReviewed application/pdf en http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf application/pdf en http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf Asadullah, Mohammed and Khan, Sher Afghan and Asrar, Waqar and Sulaeman, Erwin (2018) Passive control of base pressure with static cylinder at supersonic flow. In: 1st International Conference on Aerospace and Mechanical Engineering (AeroMech 2017), 21st-22nd Nov. 2017, Pulau Pinang. http://iopscience.iop.org/article/10.1088/1757-899X/370/1/012050 10.1088/1757-899X/370/1/012050 |
| spellingShingle | TJ241 Machine construction (General) Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin Passive control of base pressure with static cylinder at supersonic flow |
| title | Passive control of base pressure with static cylinder at supersonic flow |
| title_full | Passive control of base pressure with static cylinder at supersonic flow |
| title_fullStr | Passive control of base pressure with static cylinder at supersonic flow |
| title_full_unstemmed | Passive control of base pressure with static cylinder at supersonic flow |
| title_short | Passive control of base pressure with static cylinder at supersonic flow |
| title_sort | passive control of base pressure with static cylinder at supersonic flow |
| topic | TJ241 Machine construction (General) |
| url | http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/ http://irep.iium.edu.my/65383/1/65383_Passive%20control%20of%20base%20pressure.pdf http://irep.iium.edu.my/65383/2/65383_Passive%20control%20of%20base%20pressure_SCOPUS.pdf |