Low-Wavenumber Wall Pressure Measurements in Zero-Pressure Gradient Boundary Layer Flow

View Video Presentation: https://doi.org/10.2514/6.2022-1795.vid Low-wavenumber pressure fluctuations generated by turbulent boundary layers are the source of both flow-generated sound and structural vibration in many applications. However, the form and origin of these fluctuations are poorly understood, not least because measurement of this component of the wall pressure spectrum is especially challenging. This paper describes a new method for low-wavenumber pressure measurement using arrays of resonating sensors inspired by acoustic metamaterials. Measurements are made using the array in high Reynolds number turbulent boundary layers and shows the sub-convective components of the wall pressure spectrum in a zero-pressure gradient turbulent boundary layer flow.