Noise Reduction of UAV Using Biomimetic Propellers with Varied Morphologies Leading-edge Serration  

作　　者：Yuliang Wei Feng Xu Shiyuan Bian Deyi Kong 

机构地区：[1]State Key Laboratory of Transducer Technology,Key Laboratory of Biomimetic Sensing and Advanced Robot Technology of Anhui Province,Institute of Intelligent Machines,Chinese Academy of Sciences,Hefei 230031,China [2]Science Island Branch of Graduate School,University of Science and Technology of China,Hefei 230009,China

出　　处：《Journal of Bionic Engineering》2020年第4期767-779,共13页仿生工程学报（英文版）

基　　金：the National Natural Science Foundation of China(No.11774355).Special thanks are extended to the Wildlife Park,Hefei,Anhui,China for providing the feathers of owls and hawks.

摘　　要：The Leading-Edge(LE)serrations on owls'wings are known to be responsible for silent flight.However,this design has rarely been applied to reduce the noise of rotational rotor propellers and the morphologies of the existing serration designs are diverse.Here,we present a comparative study ofLE serrations with different morphologies in terms of the effectiveness in suppressing noise and promoting thrust forces.The performances of biomimetic propellers are investigated by Computational Fluid Dynamics(CFD)simulations and rotation experiments.The simulation results reveal that LE serrations could reduce velocity fluctuations and change the lamina-turbulent transition and turbulence distribution on the suction surface of propeller,but the morphology of the serrations influences its effectiveness.Rotation testing results indicate that the sawtooth propeller has the best performance on noise reduction(on average 2.43 dB and in maximum 4.18 dB)and simultaneously enhancing the thrust forces(3.53%).The largest practical noise reductions(4.73 dB and 3.79 rdB)using the sawtooth propeller are observed when the quad-rotor Unmanned-Aerial Vehicle(UAV)is hovering at heights of 5 m and 8 m,respectively.Our results indicate the robustness and usefulness of owl-inspired biomimetic serration devices for aero-acoustic control and aerodynamic performance promotion on propeller designs.This finding is expected to con^bute to suppressing the sound of propeller and the rotor-based aircraft.

关 键 词：unmanned-aerial vehicle BIOMIMETIC noise reduction LE serration rotor propeller 

分 类 号：U66[交通运输工程—船舶及航道工程]