Abstract
It is well known that screech tones of supersonic jet are generated by a feedback loop driven by the instability waves. Near the nozzle lip where the supersonic jet mixing layer is receptive to external excitation, acoustic disturbances impinging on this area excite the instability waves. This fact implies that the nozzle lip thickness can influence the screech tones of supersonic jet. The objective of the present study is to experimentally investigate the effect of nozzle-lip thickness on screech tones of supersonic jets issuing from a convergent-divergent nozzle. A baffle plate was installed at the nozzle exit to change the nozzle-lip thickness. Detailed acoustic measurement and flow visualization were made to specify the screech tones. The results obtained obviously show that nozzle-lip thickness significantly affects the screech tones of supersonic jet, strongly depending on whether the jet at the nozzle exit is over-expanded or under-expanded.
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Abbreviations
- D :
-
ozzle exit diameter, jet diameter
- f :
-
Frequency
- M :
-
Mach number
- OASPL:
-
Overall sound pressure level
- ρ :
-
Pressure
- ρ :
-
Radial distance from the nozzle exit
- SPL:
-
Sound pressure level
- S t :
-
Strouhal number
- T:
-
Temperature
- t :
-
Nozzle lip thickness
- t b :
-
Baffle plate thickness
- u :
-
Jet velocity
- γ :
-
Ratio of specific heats
- θ :
-
Angle with respect to the jet axis
- 0 :
-
Stagnation state in the plenum chamber
- b :
-
Ambient state
- d :
-
Design condition at the nozzle exit
- j :
-
Fully expanded condition of the jet
- ρ :
-
Peak spectrum value for the broadband shock-associated noise
- s :
-
Screech tone
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Aoki, T., Kweon, YH., Miyazato, Y. et al. An experimental study of the nozzle lip thickness effect on supersonic jet screech tones. J Mech Sci Technol 20, 522–532 (2006). https://doi.org/10.1007/BF02916483
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DOI: https://doi.org/10.1007/BF02916483