Turbulent Wall-Pressure Fluctuations in the CICLoPE Facility
Giulio Dacome (TU Delft - Aerodynamics)
Lorenzo Lazzarini (Alma Mater Studiorum Università di Bologna, Forlì)
Alessandro Talamelli (Alma Mater Studiorum Università di Bologna, Forlì)
G. 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.