Design And Characterization Of Tesla Runner With Flow Diodicity Property And Its Metamaterial Structure

Metamaterials have been the focus of research in recent years.With the rapid development of metamaterials at home and abroad,metamaterials with various functions emerge one after another.Taking Tesla channel as the basic structural unit,this paper designed a lightweight porous material with diodicity characteristics,that is,the reverse flow resistance of fluid is much greater than the forward flow resistance,and characterized its flow resistance.Firstly,the GMF(named after the initial letters of Gamboa,Morris and Forster)type Tesla runner is improved to design a new structure.The 3D printing technology was used to prepare the multistage flow passage specimen,and the turbulence model k-epsilon Realizable was determined for simulation.By comparing the numerical simulation results with the test results,the calculation errors were all within the acceptable range,which verified the reliability of the numerical simulation results.Secondly,a new dimensionless number is introduced in this paper to characterize the flow resistance performance of the Tesla flow passage.This dimensionless number is the ratio of the reverse flow time and the forward flow time of the fluid medium in the flow passage,which can be used to characterize the flow resistance performance of the Tesla flow under various inlet boundary conditions.The throttling efficiency of multistage Tesla runner under pressure boundary conditions and the decompression effect under velocity boundary conditions are studied.The temperature drop of various Tesla runner under the first type of boundary conditions is explored.The results show that the improved Tesla runner has higher temperature drop and pressure drop.Finally,based on the improved Tesla runner,a three-dimensional multi-channel structure is designed and analyzed numerically.The velocity field,pressure field and internal streamline distribution of the Tesla metamaterial are compared with that of the straight-hole channel structure.The results show that the Tesla metamaterial has better bipolarity than that of the straight-hole channel structure.