Numerical Simulation And Bionic Structure Design Of Microrotor Based On CFD

Unmanned aerial vehicle of gyroplane has been used widely in the field of military,civil and scientific research due to its flexibility and controllability,and the requirements of endurance and load capacity has been increased.But the noise generated during work hinders further expansion of the application of the unmanned aerial vehicle.The rotor is the main dynamic element of the unmanned aerial vehicle,and its aerodynamic performance affects the life and load capacity of the unmanned aerial vehicle.However,one of the main sources of noise is from its high-speed rotating process.Therefore,it is of great significance for structural design improvement to analyze the flow field and noise characteristics of the rotor.In this paper,taking DJ1045 rotor as the research object,the flow field characteristics are studied,and the improved structure schemes are proposed and the numerical simulation are carried out.Firstly,the research background and significance of this paper are reviewed,and the present situation of the research on the unmanned aerial vehicle of gyroplane at home and abroad is introduced.The main contents of this paper are presented.Secondly,the 3D model of the rotor is established by reverse engineering.According to the actual condition,the spatial computation domain is established,and the computational domain is discredited by the hybrid grid.Then the rotor flow fields under corresponding conditions are obtained through numerical simulation by Fluent software.Based on the calculation results,the basic working principle of the rotor is analyzed,which provides a basis for the structure design.Thirdly,combining the special structure of owl wings and the original rotor model,two improved rotor models are proposed,that is the raised leading edge and the serrated trailing one.The improved models are simulated,and the aerodynamic performance and noise characteristics are obtained.Then the results are compared with the original model.Finally,based on the theory of interaction of multiple structures of owl wings and the influence of two bionic structures on the rotor,the coupling bionic model is proposed.The two structures are applied to the same structure,and the numerical simulation is carried out.The results are compared with the original model,which indicates that the coupling bionic rotor not only improves the aerodynamic performance of the rotor,but also have good noise reduction effect.