胡云飞,李景昊,周香林,杜开平,马尧,于月光.FeNiCrSiMoMnC 合金气雾化熔滴的 运动与传热行为模拟分析[J].热喷涂技术,2019,11(2):19~23.
FeNiCrSiMoMnC 合金气雾化熔滴的 运动与传热行为模拟分析
Simulation and Analysis of Motion and Heat Transfer Behavior of FeNiCrSiMoMnC Alloy Droplets in Gas Atomization
  
DOI:10.3969/j.issn.1674-7127.2019.02.004
中文关键词:  雾化  铁基合金  热交换  数学模型  数值模拟
英文关键词:Gas atomization  Iron-based alloy  Heat transfer  Mathematical model  Numerical simulation
基金项目:
                 
作者单位
胡云飞 北京科技大学 新金属材料国家重点实验室
李景昊 加拿大麦吉尔大学 机械工程系
周香林 北京科技大学 新金属材料国家重点实验室
杜开平 北京矿冶科技集团有限公司
马尧 北京矿冶科技集团有限公司
于月光 北京矿冶科技集团有限公司
摘要点击次数: 68
全文下载次数: 93
中文摘要:
      气雾化过程中合金液流被高压气流破碎后,要飞行一段距离才开始冷却凝固,这称为熔滴的飞行过程。本 文以重载耐磨耐腐蚀激光熔覆涂层用 FeNiCrSiMoMnC 合金为对象,通过建立熔滴飞行过程的模型,并对该过程 进行数值模拟,计算讨论了雾化气体初始速率、熔滴直径对熔滴的速度、传热系数等参数的影响。结果表明,熔滴速度呈现先增大至最大值后逐渐减小的趋势,且随熔滴直径的增大,熔滴速度最大值点逐渐降低;传热系数与 速度曲线相反,呈先下降后上升的趋势,极小值为 2kg/d,熔滴直径越大,与气体速度差越小,传热系数越小; 随气体初始速率的增大,熔滴最大速度点上移,同时传热系数也逐渐增大。
英文摘要:
      In gas atomization, the broken droplets usually experience a short flight before their solidification. The flying process of a wear and corrosion resistant FeNiCrSiMoMnC alloy designed for the laser cladding coatings under heavy-duty condition is studied in this work. By a model established based on this process and numerical simulation, the influence of the initial gas velocity and droplet diameter on droplet velocity and heat transfer coefficient was investigated. The result shows that the fused droplet velocity increases with the flight distance at the first stage and then decreases gradually, and the maximum droplet velocity points decrease with the incremental of droplet diameter. On the contrary, the heat transfer coefficient declines sharply before it rises, the minimum value is 2kg/d. An increasing droplet diameter leads to a smaller velocity difference between the droplet and gas, thus a smaller heat transfer coefficient. The maximum droplet velocity moves up along with the initial gas velocity, at the same time, the heat transfer coefficient also increases.
查看全文  查看/发表评论  下载PDF阅读器
关闭