IGTC-29 Theoretical and Experimental Study : Effects of Acoustic Perturbation on Turbulent Pipe Flows(Session A-9 UNSTEADY AERODYNAMICS III)

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This paper describes the study of a complex turbulent flow with direct application in noise generation, turbulence supression, aeronautics and gas turbine technology. A laboratory produced, subsonic turbulent flow, artificially disturbed by acoustic waves, was forced through a horizontal pipe (3000mm long, 50.8mm in diameter). Measurements of the pressure field and hot-wire/phase locked measurements have been conducted at flow Reynolds Number of the order of 70000 and Strouhal Number around 0.13. Experiments were performed at the resonant frequency of the system (56Hz) and normalized wave amplitude intensity of 3%, in order to qualify the analytical model developed and also to supplement a new data set to support future developments. The model accurately describes the phase and amplitude (fundamental and high order harmonics) of the disturbing wave propagating through the turbulent flow. According to the analysis performed, neither the wave seems to affect the structure of the turbulent flow and vice-versa, therefore suggesting a linear type approach based upon a superposition technique which must be adequate to properly describe the overall disturbed turbulent flow.
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