Grooved cavity as a passive controller behind backward facing step
A semicircular grooved cavity is designed for controlling the base pressure and hence the base drag in case of a backward facing step. This paper presents the effect of the continuous grooved cavity to control the base pressure for various compressible subsonic flow to minimize the base drag. The...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
Penerbit Akademia Baru
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/69634/7/69634%20Grooved%20Cavity%20as%20a%20Passive%20Controller.pdf http://irep.iium.edu.my/69634/8/69634%20Grooved%20Cavity%20as%20a%20Passive%20Controller%20%20SCOPUS.pdf http://irep.iium.edu.my/69634/ http://www.akademiabaru.com/doc/ARFMTSV53_N2_P185_193.pdf |
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| Institution: | Universiti Islam Antarabangsa Malaysia |
| Language: | English English |
| Summary: | A semicircular grooved cavity is designed for controlling the base pressure and hence
the base drag in case of a backward facing step. This paper presents the effect of the
continuous grooved cavity to control the base pressure for various compressible
subsonic flow to minimize the base drag. The grooved cavity of 1.5 mm radius at 45o along a pitch circle diameter of 23 mm in the base region is employed as a passive controller.
The test is conducted for Mach 0.6, 0.7, 0.8 and 0.9. The square nozzle of side 10 mm
with an angle of incidence as 150 on all four sides from which the flow suddenly expands
to a square duct of side 25 mm acts as backward facing step model. The experimental
investigation is carried out for three ducts of length equivalent to 4, 6 and 8 times
width. The results of this investigation provide grooved cavity at 45o as a very effective
passive control mechanism to regulate the base flows, further at higher Mach numbers
it may be associated with the minor effect on the main flow field. |
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