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...
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| Main Authors: | , , , |
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| 格式: | Conference or Workshop Item |
| 語言: | English English |
| 出版: |
Institute of Physics Publishing
2018
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| 主題: | |
| 在線閱讀: | 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 http://irep.iium.edu.my/66499/ http://iopscience.iop.org/article/10.1088/1757-899X/370/1/012058/pdf |
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| 總結: | 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 |
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