Design And Optimization Of Water-Air Propeller Blade

Unmanned weapons have been gradually used in the war with the rapid development of science and technology.Unmanned aerial vehicles(UAVs)which used under water and in air are playing a more and more important role in the war.Future marine will be intelligent battlefield,which is integrated,union and multidimensional.Fast Air UAVs and invisible underwater UAVs are all very significant for the war.The cross-domain UAVs is an unmanned system that can fly fast in the air and sneak under,meanwhile,it can realize multiple independent cross-domain functions.So it can’t be replaced in future war.The water-air dual-purpose propeller is the power device of the cross-domain UAV.It is very necessary and urgent to optimize the design of the water-air dual-purpose propeller.This paper focuses on optimizing the design of water-air dual-purpose propeller.The main work as follows:(1)the design method of propeller used under water and in air is introduced in detail.Based on the working conditions of cross-domain UAV propeller and the advantages/disadvantages of underwater and aerial propeller theory,an optimized design method of water-air dual-purpose propeller is proposed.In this paper,the lift theory is used to design the propeller structure,and the lift line theory is employed to analyze its performance in air.(2)the calculation process of the strip theory is described detailedly in this paper.Combined with the cubic spline curve,the distribution of the chord length of the propeller is optimized.According to the design conditions of the water-air dual-purpose propeller,the propeller is optimized and the design result is obtained.Using the 3D modelling software Solidworks,a three-dimensional mode is built for subsequent simulation and manufacture.(3)the performance of the propeller after optimization design can be calculated by STAR-CCM software.The geometric scene in the text includes the rotating area,the stationary area,and the interface.Meshing the propeller and the watershed using automatic mesh technology in STAR-CCM software.This method is simple to operate and has high calculation accuracy.We can calculate propeller performance calculate propeller performance.The comparison of simulation results and theoretical calculation results to verify the accuracy of theoretical calculations.(4)the experimental verification of the water-air dual-purpose propeller is carried out.Based on demand,the speed sensor,thrust sensor and torque sensor are selected.And airborne and underwater test platforms are designed based on sensor structure.After those things,underwater and aerial experiments are performed separately to record experimental results.And those experimental results are compared with CFD simulation data and theoretical calculation data to verify the accuracy of CFD method.