TY - GEN
T1 - Investigation on transonic tone in supersonic nozzle
AU - Yonamine, Makiko
AU - Sungjae, Jung
AU - Aoki, Toshiyuki
PY - 2009
Y1 - 2009
N2 - The present paper describes experimental and numerical works to investigate noise phenomenon in supersonic flow that is discharged from a convergent-divergent nozzle. The noise phenomenon of flow is generated by an emission of 'transonic tone' that can be occurred independently of the general noise components at low pressure ratios that a shock wave arise within the divergent section of the nozzle. The results of obtaining show that the frequency of a transonic tone that differs from the frequency of a screech tone due to the shock-cell structures in a jet, and originates in the shock wave in the nozzle increases in proportion to the nozzle pressure ratio. The transonic tone of high-order has the directivity in the direction of the flow. Also the value of a predominant frequency of the wall static pressure fluctuation in the shock wave downstream is almost corresponding to the value of the frequency in which the transonic tone is shown.
AB - The present paper describes experimental and numerical works to investigate noise phenomenon in supersonic flow that is discharged from a convergent-divergent nozzle. The noise phenomenon of flow is generated by an emission of 'transonic tone' that can be occurred independently of the general noise components at low pressure ratios that a shock wave arise within the divergent section of the nozzle. The results of obtaining show that the frequency of a transonic tone that differs from the frequency of a screech tone due to the shock-cell structures in a jet, and originates in the shock wave in the nozzle increases in proportion to the nozzle pressure ratio. The transonic tone of high-order has the directivity in the direction of the flow. Also the value of a predominant frequency of the wall static pressure fluctuation in the shock wave downstream is almost corresponding to the value of the frequency in which the transonic tone is shown.
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M3 - Conference contribution
AN - SCOPUS:84871465246
SN - 9781615677368
T3 - 16th International Congress on Sound and Vibration 2009, ICSV 2009
SP - 2672
EP - 2678
BT - 16th International Congress on Sound and Vibration 2009, ICSV 2009
T2 - 16th International Congress on Sound and Vibration 2009, ICSV 2009
Y2 - 5 July 2009 through 9 July 2009
ER -