Turbulent Wall-Pressure Fluctuations in the CICLoPE Facility
G. Dacome (TU Delft - Aerodynamics)
L.L. Lazzarini (Alma Mater Studiorum Università di Bologna, Forlì)
A. Talamelli (Alma Mater Studiorum Università di Bologna, Forlì)
Gabriele Bellani (Alma Mater Studiorum Università di Bologna, Forlì)
W.J. Baars (TU Delft - Aerodynamics)
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Abstract
Wall-pressure spectra and coherence between wall-pressure and streamwise velocity in a turbulent pipe flow are presented. An experimental investigation was conducted in the CICLoPE long-pipe facility at friction Reynolds numbers in the range of 4700≲Reτ≲46000. Wall-pressure energy spectra reveal an alignment of the inner-spectral peak location in terms of λx+≈250, as well as an increase in overall energy content with increasing Reτ. Linear coherence spectra between wall-pressure and streamwise velocity in the logarithmic region follow a Reynolds-number-independent wall-scaling. Identification of such a universal scaling contributes to compelling evidence that wall-pressure sensing, as an input for real-time flow control, is a feasible approach for implementation in practical engineering systems.