INTERACTION OF A SLOT-TONE WITH A PIPE

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Presentation transcript:

INTERACTION OF A SLOT-TONE WITH A PIPE Alexis Billon, Vincent Valeau and Anas Sakout L.E.P.T.A.B., University of La Rochelle, France

Summary Experimental apparatus Overview of the operating range of the self-sustained tones Evolution of the slot-tone with the jet velocity and the system geometry Identification of the amplified instability Comparison of the acoustic fields within and outside the pipe Conclusion

Experimental apparatus Length parameter: Fundamental frequency of the tones

Overview of the self-sustained tones Typical pressure spectrum f0 2f0 f0/2 f0+f0/2 Operating range of the self-sustained tones: Velocity : from Re0=2400 Geometric : 1.1<L/H<7.5 S.P.L.max = 115 dB

Influence of the plate distance (Re0=11.104)

Calculation of the shear-layer natural frequency Michalke’s formula : Where : fn = 1350 Hz Calculated frequency : Conclusion : same order of magnitude than the self-sustained tones

Influence of the jet velocity (L/H=3.0)

Comparison of the radiated acoustic field with the acoustic field inside the duct Coherence Radiated acoustic field

Comparison of the radiated acoustic field with the acoustic field inside the duct Coherence Radiated acoustic field

Conclusion Strong self-sustained tones occur over Re0=2400 and 1.1<L/H<7.5 The self-sustained tones are the result of the shear-layer instabilities Below Re0~7000, the inner and the outer acoustic fields of the duct are weackly coupled. The hydrodynamic feedback is dominant. Above Re0~7000, the pipe acoustic field reinforces and controls the self-sustained tones. The acoustic feedback is dominant.