Active control of suddenly expanded flow
This paper presents the results of an experimental investigation carried out to control the base pressure in a suddenly expanded axi-symmetric passage. An active control in the form of microjets was employed to control the base pressure. Microjets at four locations in a pitch circle diameter at...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2000
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46689/ http://irep.iium.edu.my/46689/ http://irep.iium.edu.my/46689/1/46689.pdf |
| Summary: | This paper presents the results of an experimental investigation carried
out to control the base pressure in a suddenly expanded axi-symmetric
passage.
An active control in the form of microjets
was employed to control the base
pressure. Microjets at four locations in a pitch circle diameter at the base
was used as the active control. The jet Mach numbers
at the entry to the sudden expansion was varied from 1.25 to 3.0.
The area ratio of the present study is 3.24.
The enlarged duct length-to-diameter ratio was
varied from 10 to 1. The nozzle generating the above jet Mach numbers
were operated with nozzle pressure ratio (NPR) in the range from 3 to 11.
The wall pressure distribution in the enlarged duct was also measured to
account for the effect of the active control on the enlarged duct pressure
field.
It is found that the microjets act as an effective control for controlling the
base pressure field.
A maximum of 35 percent increase in
base pressure was achieved for certain combination of parameters.
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