A unified computational model for surface texturing process of strip casting rollers
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摘要
A new unified computational method is proposed for modeling the relationship between the parameters of the high-speed particle-impact texturing process and the final surface morphology of the casting roller. The whole surface-texturing process is divided into three parts. The first part is the acceleration process of particles inside and outside the nozzle,which can be analyzed using the computational fluid dynamics method to obtain the particle impact velocities. The second part is a simulation of the bombardment process of particles onto the roller surface using the LS-DYNA software as the analysis tool and the results obtained in the first part as input parameters. The last part is the continuously random impact process of particles on the casting roller surface to form a functional surface,which is characterized by a simplified roughness model. Finally,the above three parts are combined to establish a unified computational model,the performance of which is successfully verified in a series of experiments.
A new unified computational method is proposed for modeling the relationship between the parameters of the high-speed particle-impact texturing process and the final surface morphology of the casting roller. The whole surface-texturing process is divided into three parts. The first part is the acceleration process of particles inside and outside the nozzle,which can be analyzed using the computational fluid dynamics method to obtain the particle impact velocities. The second part is a simulation of the bombardment process of particles onto the roller surface using the LS-DYNA software as the analysis tool and the results obtained in the first part as input parameters. The last part is the continuously random impact process of particles on the casting roller surface to form a functional surface,which is characterized by a simplified roughness model. Finally,the above three parts are combined to establish a unified computational model,the performance of which is successfully verified in a series of experiments.
A new unified computational method is proposed for modeling the relationship between the parameters of the high-speed particle-impact texturing process and the final surface morphology of the casting roller. The whole surface-texturing process is divided into three parts. The first part is the acceleration process of particles inside and outside the nozzle,which can be analyzed using the computational fluid dynamics method to obtain the particle impact velocities. The second part is a simulation of the bombardment process of particles onto the roller surface using the LS-DYNA software as the analysis tool and the results obtained in the first part as input parameters. The last part is the continuously random impact process of particles on the casting roller surface to form a functional surface,which is characterized by a simplified roughness model. Finally,the above three parts are combined to establish a unified computational model,the performance of which is successfully verified in a series of experiments.
引文
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[3] LI W Y,LIAO H L,WANG H T,et al. Optimal design of a convergent-barrel cold spray nozzle by numerical method[J]. Applied Surface Science,2006,253(2):708-713.
[4] MAO Z S. Knowledge on particle swarm:the important basis for multi-scale numerical simulation of multiphase flow s[J]. The Chinese Journal of Process Engineering,2008,8(4):645-659.
[5] ZHANG A F,ZHOU Z M,LI D C,et al. Numerical simulation of gas-solid tw o-phase flow field on coaxial pow der nozzle in laser metal direct manufacturing[J].Journal of Xi’an Jiaotong University,2008,42(9):1169-1173.
[6] JIA G Z,CAO W,NIE Z L,et al. Analysis of kinetic property of particles in pneumatic sand blasting nozzle[J].Journal of Daqing Petroleum Institute,2006,30(1):63-66.