Active control of base pressure with counter clockwise rotating cylinder at Mach 2
The effect of dynamic cylinder as an active controller to control the base pressure for different level of expansion have been experimentally investigated at Mach 2 through CD nozzle for area ratio 9. Solitary counter clockwise rotating cylinder of 2 mm diameter when seen from top, at 2 mm from...
| Main Authors: | , , |
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| Format: | Conference or Workshop Item |
| Language: | English English English |
| Published: |
Institute of Electrical and Electronics Engineers Inc.
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/67151/ http://irep.iium.edu.my/67151/ http://irep.iium.edu.my/67151/ http://irep.iium.edu.my/67151/1/67151_Active%20Control%20of%20Base%20Pressure%20with%20Counter_complete.pdf http://irep.iium.edu.my/67151/2/67151_Active%20Control%20of%20Base%20Pressure%20with%20Counter_scopus.pdf http://irep.iium.edu.my/67151/13/67151_Active%20Control%20of%20Base%20Pressure%20with%20Counter%20_wos.pdf |
| Summary: | The effect of dynamic cylinder as an active
controller to control the base pressure for different level of
expansion have been experimentally investigated at Mach 2
through CD nozzle for area ratio 9. Solitary counter clockwise
rotating cylinder of 2 mm diameter when seen from top, at 2 mm
from side wall of square duct and 8 mm from square nozzle exit in
the base region is mounted as a controller. Base pressure in the
wake area after sudden expansion of jets from the exit of nozzle
has been measured. The length-to-width ratio of sudden expansion
duct taken is 10. The experiments were carried out by operating
jets for different nozzle pressure ratios (NPR). The wall pressure
distribution was also measured for with and without control cases
in the duct to see that the amplitude of oscillations does not
adversely influence the flow field in the duct. Counter clockwise
rotating cylinder as an active controller were found to increase the
base pressure as high as 62 percent at NPR 8.5 and 53 percent at
NPR 7.8. The control effectiveness is marginal for over expanded
nozzles. The wall pressure flow field with and without control are
identical with minor fluctuations. |
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