| 喷射成形工艺中限制型喷嘴雾化气流场的数值模拟 |
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| 引用本文： | 张勇,;李佩桓,;李正栋,;张国庆,;倪新雷.喷射成形工艺中限制型喷嘴雾化气流场的数值模拟[J].中国材料科技与设备,2014(5):19-22. |
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| 作者姓名： | 张勇 ;李佩桓 ;李正栋 ;张国庆 ;倪新雷 |
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| 作者单位： | [1]中航工业北京航空材料研究院,先进高温结构材料重点实验室,北京100095; [2]通用电气(中国)有限公司,北京100004 |
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| 基金项目： | 国家重点基础研究发展计划（973计划）资助项目（2011CB606303） |
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| 摘 要： | 利用CFD技术对在粉末冶金和喷射成形工艺中广泛使用的限制型雾化喷嘴的气体流场进行了计算。结果表明在限制型喷嘴中气流的会聚角度对金属液导流管前端的压力场和气体流场有很大的影响。平行气流可以在负压的作用下会聚到轴线上。随会聚角度增加，导液管前端的压力提高，金属导液管前端的压力场由负压向正压转变，气流沿导液管轴线方向速度的最大值也随会聚角的增加而增大，气流在会聚点处的动能也随之增加。限制型喷嘴的气体流场还受到金属导液管位置的影响，随导液管的伸出可以促进负压区的形成，提高抽吸力，保证金属液的顺利流出。
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| 关 键 词： | 数值模拟 CFD 气体流场 雾化喷嘴 |
Atomizing Gas Flow Field Simulation of Confined Nozzles Used in Spary Forming Technology |
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| Affiliation: | ZHANG Yong , LI Pei-huan , LI Zheng-dong, ZHANG Guo-qing, NI Xin-lei (1. Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials AVIC , Beijing , 100095, China; 2. GE CHINA, Beijing , 100004, China) |
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| Abstract: | Research through Computer Fluent Dynamic （CFD） was made on flow fields of confined nozzles which have been broadly used in powder metallurgy and spray forming technology. Results were found that the convergent angle and extrusion of guide tube greatly effected the flow field. Parallel gas flow can be converged at one point due to the negative pressure effect. With the increasing of convergent angle, negative pressure field was reduced and even extinguished. Maximum gas velocity and momentum was improved due to the increased convergent angle. Extrusion of guide tube may contribute to formation of negative pressure field and aspiration phenomenon~ thereby a negative pressure field can be kept at a wide range of convergent angle. |
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| Keywords: | Numerical simulation CFD Gas flow field Atomization nozzle |
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