Counter clockwise rotation of cylinder with variable position to control base flows
Experimental study of supersonic base flow at Mach 2 has been carried out to see the effect of cylinder when rotated counter clockwise inside the dead zone at variable locations near its base to control base pressure for different level of expansion for area ratio 9. Active cylinder of 2 mm diame...
| Main Authors: | , , , |
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| Format: | Proceeding Paper |
| Language: | English English |
| Published: |
Institute of Physics Publishing
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/66499/ http://irep.iium.edu.my/66499/1/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_conference%20article.pdf http://irep.iium.edu.my/66499/2/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_scopus.pdf |
| _version_ | 1848786590110842880 |
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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 | Experimental study of supersonic base flow at Mach 2 has been carried out to see
the effect of cylinder when rotated counter clockwise inside the dead zone at variable locations
near its base to control base pressure for different level of expansion for area ratio 9. Active
cylinder of 2 mm diameter rotating counter clockwise when seen from top, is mounted as a
controller. Three locations are chosen from the side wall of square duct namely at 2, 4, 6 mm
respectively and 8 mm from square nozzle exit in the base region to mount the controller. Base
pressure in recirculation zone and wall pressure along the square duct length has been
measured with and without control. The experiments were carried out for NPR 2, 3, 6, 7.8 and
8.5. Cylinder when rotated counter clockwise as an active controller were found to reduce the
base drag as high as 62 percent at NPR 8.5 when located near to duct wall and 50 percent when
located away from duct wall for the same NPR. For perfectly expanded flows at NPR 7.8 the
reduction in base drag was 53 percent near duct wall and 44 percent near duct wall. The active
controller was up to 19 percentage effective for over expanded flows near to duct wall and up
to 12 percent when located away from duct wall. Also, the control did not adversely affect the
flow field. Key words: Wall pressure - base pressure - nozzle pressure ratio - active control |
| first_indexed | 2025-11-14T17:11:27Z |
| format | Proceeding Paper |
| id | iium-66499 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:11:27Z |
| publishDate | 2018 |
| publisher | Institute of Physics Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-664992018-09-25T04:01:01Z http://irep.iium.edu.my/66499/ Counter clockwise rotation of cylinder with variable position to control base flows Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin T Technology (General) TL Motor vehicles. Aeronautics. Astronautics Experimental study of supersonic base flow at Mach 2 has been carried out to see the effect of cylinder when rotated counter clockwise inside the dead zone at variable locations near its base to control base pressure for different level of expansion for area ratio 9. Active cylinder of 2 mm diameter rotating counter clockwise when seen from top, is mounted as a controller. Three locations are chosen from the side wall of square duct namely at 2, 4, 6 mm respectively and 8 mm from square nozzle exit in the base region to mount the controller. Base pressure in recirculation zone and wall pressure along the square duct length has been measured with and without control. The experiments were carried out for NPR 2, 3, 6, 7.8 and 8.5. Cylinder when rotated counter clockwise as an active controller were found to reduce the base drag as high as 62 percent at NPR 8.5 when located near to duct wall and 50 percent when located away from duct wall for the same NPR. For perfectly expanded flows at NPR 7.8 the reduction in base drag was 53 percent near duct wall and 44 percent near duct wall. The active controller was up to 19 percentage effective for over expanded flows near to duct wall and up to 12 percent when located away from duct wall. Also, the control did not adversely affect the flow field. Key words: Wall pressure - base pressure - nozzle pressure ratio - active control Institute of Physics Publishing 2018 Proceeding Paper PeerReviewed application/pdf en http://irep.iium.edu.my/66499/1/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_conference%20article.pdf application/pdf en http://irep.iium.edu.my/66499/2/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_scopus.pdf Asadullah, Mohammed and Khan, Sher Afghan and Asrar, Waqar and Sulaeman, Erwin (2018) Counter clockwise rotation of cylinder with variable position to control base flows. In: 1st International Conference on Aerospace and Mechanical Engineering, AeroMech 2017, 21 - 22 November 2017, Parkroyal HotelBatu Ferringhi, Penang; Malaysia. http://iopscience.iop.org/article/10.1088/1757-899X/370/1/012058/pdf 10.1088/1757-899X/370/1/012058 |
| spellingShingle | T Technology (General) TL Motor vehicles. Aeronautics. Astronautics Asadullah, Mohammed Khan, Sher Afghan Asrar, Waqar Sulaeman, Erwin Counter clockwise rotation of cylinder with variable position to control base flows |
| title | Counter clockwise rotation of cylinder with variable position to control base flows |
| title_full | Counter clockwise rotation of cylinder with variable position to control base flows |
| title_fullStr | Counter clockwise rotation of cylinder with variable position to control base flows |
| title_full_unstemmed | Counter clockwise rotation of cylinder with variable position to control base flows |
| title_short | Counter clockwise rotation of cylinder with variable position to control base flows |
| title_sort | counter clockwise rotation of cylinder with variable position to control base flows |
| topic | T Technology (General) TL Motor vehicles. Aeronautics. Astronautics |
| url | http://irep.iium.edu.my/66499/ http://irep.iium.edu.my/66499/ http://irep.iium.edu.my/66499/ http://irep.iium.edu.my/66499/1/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_conference%20article.pdf http://irep.iium.edu.my/66499/2/66499_Counter%20Clockwise%20Rotation%20of%20Cylinder_scopus.pdf |