Research On Drag Reduction Performance Based On Diamond Imprinting Microstructure

With the rapid development of science and technology,non-renewable energy sources such as oil and natural gas have been exploited and used in large quantities by people.The energy problem has become an urgent problem that people need to solve at this stage.In order to solve the energy problem,it is necessary to reduce the resistance of fluids in the fields of pipeline transportation,aerospace and navigation,so as to effectively improve the utilization rate of energy and alleviate the current energy crisis.In this environment,the research on drag reduction of bionic non-smooth surfaces has gradually attracted attention.Bionic nonsmooth surface drag reduction is a hot spot in the current bionics research.After decades of development,good research results have been achieved.However,most of the current research directions are for groove-type non-smooth surfaces.Research on the shape of the drag-reducing microstructure is still relatively small.Therefore,this paper proposes a new type of drag reduction microstructure based on the principle of bionics,applies it to the field of fluid drag reduction and studies its drag reduction performance and processing methods,supplements the existing types of bionic drag reduction microstructures,The development and application of smooth surface drag reduction is of great significance.First,based on the basic methods of engineering bionics research,and inspired by hydraulic machinery and desert surface morphology and biological surface pits on the basis of existing drag reduction microstructures,the characteristics of drag reduction information on ecological surfaces are extracted,thereby establishing fish-scale pits.Pit model.On this basis,FLUENT is used for numerical simulation research.In order to further analyze the drag reduction mechanism of fish-scale pits,the principle of drag reduction is studied in detail from the three aspects of velocity field,wall shear stress and turbulence statistics.In order to obtain the drag reduction effect of fish-scale pits with different pit sizes and arrangements,this paper adopts the orthogonal experiment method to carry out simulation experiments under different conditions.Through the analysis of variance and range analysis,the degree of influence of each factor on the drag reduction rate of the fish-scale pit nonsmooth surface is finally obtained,and the optimal fish-scale pit non-smooth surface size parameter within the preset size range is obtained according to the test results.Finally,the diamond imprint microstructure platform was designed and developed according to the experimental processing requirements,and the key components of the angle adjustment device and the precision drive spindle were analyzed and designed in detail.The tool size model was established according to the size of the pits to be processed,and the mathematical model was established for the eccentricity phenomenon in the stamping process,and the expression of the indentation angle of the indenter was calculated,and the fish scales that were consistent with the theoretical model were processed on the copper sheet.-Type pit microstructure.Finally,an experimental platform was built to verify the drag reduction performance of the non-smooth surface of the fish-scale pits,which proved the correctness of the theoretical analysis and simulation experiments.The research results of this paper provide a reference for the engineering and practical application of the bionic non-smooth surface drag reduction technology,and promote the development of the future non-smooth surface drag reduction technology.