This paper proposes two different noise cancelation techniques for cleaning wallpressure fluctuations signals. These fluctuations are measured around a circular cylinder with laminar and turbulent flow separation. The noise cancelation techniques are based on Wiener and adaptive filters and use the signals of pressure transducers mounted in a cross section of the cylinder and the signal of a free-field sensor opportunely located upstream. First, synthetic signals are used in order to validate the procedure. Then, both techniques are applied to the experimental data. Specific attention is paid to the filter order, optimized by a method introduced in this paper. Both filter types showed a selective behavior preserving the essence of the fluid dynamic phenomena characterizing the flow fields at each Reynolds number tested, especially when laminar separation occurs.
|Titolo:||Noise Filtering for Wall-Pressure Fluctuations in Measurements Around a Cylinder With Laminar and Turbulent Flow Separation|
|Data di pubblicazione:||2016|
|Digital Object Identifier (DOI):||10.1115/1.4032034|
|Appare nelle tipologie:||1.1 Articolo in rivista|
File in questo prodotto:
| Noise cancellation for wall pressure fluctuations JFluid Engineering 138.pdf||versione dell'autore||2. Post-print||Non Pubblico - Accesso privato/ristretto||Administrator Richiedi una copia|