Aerodynamic Calculation And Analysis Of Tail-sitter On CFD

Tail-Sitter type unmanned aerial vehicle(UAV)is one kind has the vertical take-off and landing of the helicopter and unmanned aerial vehicles capable of fixed-wing UAV level flight,it has a good environmental adaptability and flight efficiency and the significant value.Therefore,the analysis and research of the Tail-Sitter UAV has important theoretical and practical significance.This paper firstly introduces the characteristics and research status of the Tail-Sitter UAV at home and abroad,then the aerodynamic analysis and research of self-designed Tail-Sitter unmanned vehicle are carried out,The main research work includes the following aspects:In chapter 2,the governing equations required for this operation are constructed and dispersed.In this paper,the S-A model suitable for the movement of rotating machinery and the SIMPLE algorithm for solving the governing equations in a separate and uncoupled way are adopted for CFD numerical simulation.And parallel computing technology is introduced.And several different grid generation methods are introduced.Aiming at the characteristics of the physical model and flow field of the Tail-Sitter UAV and the requirements of the numerical simulation of the propeller using the moving reference frame and source momentum methods respectively,a set of grid generation methods suitable for the two different calculation methods are constructed.In chapter 3,the Blade Element Theory is analyzed and introduced in detail,and an example is introduced to divide the calculation model into mixed grids.The source momentum method model based on the Blade Element Theory is simulated numerically.The calculated value is compared with the experimental value to verify the effectiveness of the proposed method.In chapter 4,the moving reference frame calculation method is briefly introduced,the helicopter rotor calculation example is introduced,the non-structural grid is divided,the moving reference frame method is used for numerical simulation,The calculated value is compared with the experimental results,and the effectiveness of this method is verified.In chapter 5,the Tail-Sitter UAV is designed by myself.Numerical simulation of the takeoff andcruise flight of the Tail-Sitter is carried out by using sliding grid and source momentum two different methods to obtain its aerodynamic parameters,and the influence of the two different methods on the ground effect of the Tail-Sitter UAV is also used.