Experimental and numerical investigations on rotor noise in axial descending flight
Yuhong Li, Xiangtian Li, Han Wu, Peng Zhou, Xin Zhang, Siyang Zhong
Abstract
We investigate the aerodynamic and aeroacoustic characteristics of a small-scale drone rotor operating in axial descending flight. The integrated aerodynamic forces and the far-field noise are measured by wind tunnel experiments. Then, near-field flow structures and corresponding noise source analysis are presented based on computational aeroacoustics (CAA) simulations. We found the unique acoustic feature of descending flight is the haystacking-like spectral humps, possibly caused by the interaction between the blade leading edge and the rotor wake.
Topics & Concepts
AerodynamicsAeroacousticsWakeNoise (video)Rotor (electric)Wind tunnelAcousticsVortexPhysicsAerospace engineeringTrailing edgeLeading edgeMechanicsEngineeringComputer scienceSound pressureImage (mathematics)Artificial intelligenceQuantum mechanicsAerodynamics and Acoustics in Jet FlowsFluid Dynamics and Turbulent FlowsAerodynamics and Fluid Dynamics Research