气-固两相流雾化喷嘴的磨损分析

发布时间：2018-03-31 11:10

本文选题：雾化法　切入点：气-固两相流　出处：《表面技术》2017年09期

【摘要】：目的为了解决雾化法磁性磨料制备过程中,雾化喷嘴容易发生冲蚀磨损而无法形成有效流场的问题,分析雾化喷嘴的冲蚀磨损机理,为雾化喷嘴的设计提供理论依据。方法选用Al2O3硬质磨料颗粒、Si C材料的喷嘴,运用理论分析与计算机模拟(CFD)相结合的方法,探究雾化喷涂冲蚀磨损的机理,并研究雾化压力与最大冲蚀磨损率的关系。结果运用理论分析,得出了雾化喷嘴的冲蚀磨损形式为脆性断裂与微切削两种。运用CFD计算机模拟分析,得出了雾化喷嘴的冲蚀磨损分布图,其冲蚀磨损率随着雾化压力的增加而增加。当雾化压力为3 MPa时,雾化喷嘴的最大冲蚀磨损率达到了5.3×10-7 kg/(m2·s);当雾化压力为5 MPa时,雾化喷嘴的最大冲蚀磨损率达到了1.3×10-6 kg/(m2·s),较3 MPa时增加了59%。结论可以采取将硬质磨料注入与雾化工序分离的方法来改进雾化喷嘴的结构,从而减少在制备磁性磨料过程中硬质磨料颗粒对雾化喷嘴内壁的冲蚀磨损。
[Abstract]:Aim in order to solve the problem that the atomizing nozzle is prone to erosion and can not form an effective flow field during the preparation of the atomized magnetic abrasive, the erosion wear mechanism of the atomizing nozzle is analyzed. To provide the theoretical basis for the design of atomizing nozzle. Methods the nozzle of Al2O3 hard abrasive particle / sic material was selected, and the mechanism of erosion wear of atomization spraying was explored by combining theoretical analysis with computer simulation. The relationship between atomization pressure and maximum erosion wear rate is studied. Results the erosion wear patterns of atomizing nozzle are brittle fracture and micro cutting by using theoretical analysis. The erosion wear distribution of atomizing nozzle is obtained, and the erosion wear rate increases with the increase of atomization pressure. When atomization pressure is 3 MPa, the maximum erosion wear rate of atomizing nozzle reaches 5.3 脳 10 ~ (-7) kg/(m2 ~ (-1), and when atomization pressure is 5 MPa, the maximum erosion wear rate of atomizing nozzle is 5.3 脳 10 ~ (-7) kg/(m2 ~ (-1). The maximum erosion wear rate of atomizing nozzle is 1.3 脳 10 ~ (-6) kg/(m2 ~ (-1), which is 59% higher than that of 3 MPa. Conclusion the structure of atomizing nozzle can be improved by separating hard abrasive injection from atomization process. Thus the erosion wear of hard abrasive particles on the inner wall of atomizing nozzle is reduced during the preparation of magnetic abrasive.
【作者单位】：山东理工大学精密制造与特种加工山东省重点实验室;
【基金】：国家自然科学基金面上项目(51375285)~~
【分类号】：TG73

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