| Wear,corrosion and surface oxidation are common problems that faced by theworld’s industrial production, and how to improve the wear and corrosion resistance ofparts of the surface can improve the life of parts, and is a key factor in improving thesurface properties. Take effective surface treatment technology can reduce surfacewear of parts,and improve the service life of parts. Cold Spray technology is anemerging coating technology, in order to improve the efficiency of spraying, the paperdesigned the core component of cold spray technology structure of the supersonicnozzle, and numerically simulated the flow field inside the nozzle, and improved thedesign of the nozzle based on the simulation results so that the solid particles can reacha maximum injection speed.Firstly,this paper designes a supersonic cold spraying nozzle that meets therequirements depends on cold spray nozzle technical requirements and relevantknowledge of hydrodynamics and aerodynamics;Secondly,the software FLUENT is used to numerically simulate single gas phaseflow and gas-solid flow within the nozzle,and the distribution of single gas phase flowfield within the nozzle and the speed distribution of different diameter of particles thatalong the axis of the nozzle are obtained.Thirdly,changing the entry state parameters,research the effects of different inletparameters on the flow field within the nozzle,and the flow field distributions thatunder different condition parameters are obtained,and some helpful suggestions indesign are provided.Finally, change the nozzle structure, the effects of different structures on thenozzle exit velocity are studied,and the nozzle is structurally improved based on it. |
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