Research And Experiment On Non-smooth Surface Drag Reduction Technology

Today,underwater autonomous vehicles have been widely used in various fields,and their wide applicability can bring great convenience to underwater detection,scientific research,accident rescue and other fields.As a branch of the underwater self-propelled aircraft,the bionic underwater robot uses the fish-like movement method to better solve the problems of low efficiency,high energy consumption,and high disturbance of the traditional propeller aircraft,which is the future industry.The focus of research.In order to improve the motion efficiency of the underwater robot and reduce the resistance it receives is the focus of the design.For the drag reduction problem of the underwater robot,from the perspective of drag reduction of the non-smooth surface,this paper has conducted a study using simulation analysis tools.The drag reduction effect of the drag reduction structure was compared and analyzed.This article first summarizes the current main methods of wall drag reduction and research status,and further elaborate on the main research content of this article,that is,non-smooth surface drag reduction technology,and compares the advantages and disadvantages of several mainstream methods.The movement characteristics and movement environment determined that the center of gravity of the drag-reducing structure research is rib-like structure,traveling wave structure and pit bulge structure.Secondly,the resistance of the underwater robot in the flow field environment is analyzed,and the relevant mathematical models are constructed based on the characteristics of its navigation,including the governing equations and turbulence models in fluid dynamics,and the discrete method and solution method are determined.Aiming at the above several drag reduction structures,Fluent software was used for CFD simulation,combined with the swimming characteristics of the bionic underwater robot,and simulations were conducted respectively.After comparing the simulation results,it was found that the pit structure can better meet the demand.Combined with the results of comparative simulation analysis,further simulation research was carried out,and the drag reduction effect of the pit structure in the range of inflow angle0-30°and speed 1m/s-20m/s was obtained,and further pit structure was carried out Optimal design of the size parameters of the system,and the optimal drag reduction scheme is obtained after the optimization design.In order to carry out further experiments in combination with the simulation results,a bionic dolphin-type underwater robot was designed and manufactured,and a bionic dolphin with a pit surface drag reduction structure and a bionic dolphin with a smooth surface were subjected to an underwater comparison experiment,drag reduction effect good.