Array experimental study on turbulent boundary layer fluctuation pressure wavenumber frequency spectrum of airfoil/plate in acoustic wind tunnel

DOI:	10.11809/bqzbgcxb2024.12.011
Keywords:	wavenumber frequency spectrum; airfoil; flat plate; surface array of pulsating pressure sensors; Chase Ⅰ mode
Abstract:	In the acoustic wind tunnel, embedded flush mounted pressure fluctuation sensors arranged in a surface array were used to measure and analyze the wavenumber frequency spectra of the turbulent boundary layer on a smooth plate and airfoils at different angles of attack. This study aimed to compare the wavenumber frequency spectra and evaluate the predictive performance of the Chase Ⅰ model. The experimental results demonstrated the measurement capability and accuracy of the surface array in assessing the wavenumber frequency spectra of both the smooth plate and the airfoils. The measured data for the smooth plate showed good agreement with the predictions of the Chase Ⅰ model, while the predictions for the airfoils exhibited some deviations, indicating that surface pressure gradients affect the wavenumber frequency spectra. Furthermore, variations in wind speed and angle of attack significantly influenced the wavenumber frequency spectra of the airfoils, highlighting the limitations of the Chase Ⅰ model in predicting such spectra for airfoils. The findings of this study can provide valuable references for applications and research in flow induced vibration and noise engineering.
Issue:	Vol. 45 No. 12 (2024)
Published:	2024-12-30
PDF HTML