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.
关键词
波数-频率谱/翼型/平板/脉动压力传感器表面阵列/Chase/Ⅰ模型
Key words
wavenumber-frequency spectrum/airfoil/flat plate/surface array of pulsating pressure sensors/Chase Ⅰ mode
维普
万方数据