Dr. Yanan Wang
Xi’an Jiaotong University, China
Title: Mechanism of the wavy leading edge in reducing airfoil noise at low Reynolds numbers
Abstract:
Humpback whales benefit from the wavy leading-edge protuberances on their flippers, which enable quiet predation. Inspired by this bionic structure, this study investigates the mechanism of wavy leading edges in reducing the self-noise from airfoils at low Reynolds numbers, employing both wall-resolved large-eddy simulations and wind tunnel measurements. The results demonstrate that both the tonal and broadband noise from the baseline airfoil can be suppressed promisingly by introducing the wavy leading edge. Subsequently, the noise reduction mechanisms related with the tonal and broadband components are explored thoroughly. It turns out that the streamwise vortices induced by the wavy leading edge can modify the boundary layer development and thereby disrupting the acoustic feedback loop responsible for the tonal noise generation. In addition, the convective velocity and the wall-pressure fluctuations are also decreased due to the wavy leading edge, leading to lower broadband noise.
Biography:
Dr. Yanan Wang is currently
an associate professor in the school of Mechanical Engineering at Xi’an
Jiaotong University. She got her PhD degree in 2020 from the Institute of Sound
and Vibration (ISVR) in the University of Southampton and then worked as a research
fellow at Rolls-Royce UTC in Propulsion Systems Noise in ISVR, before joining
Xi’an Jiaotong University. Her research interests include aerodynamics and
aeroacoustics induced by bluff bodies and turbomachinery, as well as noise
reduction methods. She has published more than 20 papers in top-tier
peer-reviewed journals such as JFM, PoF, C&F et al. and has more than 10 issued
or pending patents.