约束喷射沉积过程中雾化气流场的模拟研究  被引量:2

Simulation of Atomization Gas Flow Field During Constrained Spray Deposition Process

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作  者:尹建成[1] 杨环[1] 刘英莉[2] 陈业高[1] 张八淇 钟毅[1] YIN Jian-cheng1 ,YANG Huan1 ,LIU Ying-li2 , CHEN Ye-gao1 ,ZHANG Ba-qi1 ,ZHONG Yi1(1 Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;2 Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650504,China)

机构地区:[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学信息工程与自动化学院,昆明650504

出  处:《材料工程》2018年第11期102-109,共8页Journal of Materials Engineering

基  金:国家自然科学基金项目(50874055);云南省教育厅科学研究基金项目(2016ZZX041)

摘  要:采用双旋转盘流型控制器约束雾化射流,利用计算流体动力学Fluent软件模拟分析不同雾化气体压力下约束喷射沉积的流场特性,并进行了实验验证。结果表明:随着雾化气体压力的增加,反向气流速度增大,导流管出口温度降低,极易出现堵塞现象。当雾化气体压力为2.5×10~5Pa、熔体入口压力为2.0×10~4Pa时,作用于熔体上的压强最小,约为8.99×10~3Pa,金属熔体可顺利流出,沉积坯没有明显的氧化现象,雾化效果最好,且沉积坯的宽度与连续挤压机轮槽的宽度一致。Double disks controller was used to constrain the size of spray plume.The flow field characteristics of the constrained spray technology under different gas inlet pressures were simulated by the computational fluid dynamics(CFD)software"Fluent",and the simulation result was experimentally verified.The results show that with the increase of atomization gas inlet pressure,the speed of reverse gas flow increases,and thus,the temperature of the nozzle tip decreases.In this case,solidification of the melt in the nozzle occurs.When the inlet pressures of the gas and metal are 2.5×10~5 Pa and2.0×10~4 Pa respectively,the pressure acting on the melt decreases to minimum value of about 8.99×10~3 Pa.At this condition,the molten metal flows out smoothly and no apparent oxidation phenomena appear in the deposition billet.Moreover,the effect of atomization is the best and the width of the deposition billet is exactly consistent with the width of the wheel groove of continuous extrusion machine.

关 键 词:喷射成形 喷射沉积连续挤压 气体压力 数值模拟 

分 类 号:TF124.36[冶金工程—粉末冶金]

 

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