摘要
Cooling strength is one of the important factors affecting microstructure and properties of gas cylinders during quenching process,and reasonable water spray volume can effectively improve the quality of gas cylinders and reduce production costs.To find the optimal water spray parameters,a fluid-solid coupling model with three-phase flow was established in consideration of water-vapor conversion.The inner and outer walls of gas cylinder with the dimensions of d914 mm×38 mm×12000 mm were quenched using multi-nozzle water spray system.The internal pressure,average heat transfer coefficient(have)and stress of the gas cylinder under different water spray volumes during quenching process were studied.Finally,the mathematical model was experimentally verified.The results show that both the internal pressure and have increase along with the increase of spray volume.The internal pressure increases slowly first and then rapidly,but have increases rapidly first and then slowly.To satisfy hardenability of gas cylinders,the minimum spray volume should not be less than 40 m^3/(h·m).The results of stress indicate that water spray quenching will not cause deformation of bottle body in the range of water volume from 40 to 290 m^3/(h·m).
冷却强度是影响气瓶淬火组织性能的重要因素,合理的喷水量可以有效提高气瓶质量,降低生产成本.为了寻找最佳的喷水参数,考虑了水-汽的转化,建立了三相流共存的流-固耦合模型.采用多喷嘴喷水系统对气瓶尺寸为d 914 mm×38 mm×12000 mm的内壁和外壁进行了淬火冷却,研究了气瓶淬火时不同喷水量下内部压强、平均换热系数和瓶体应力的分布规律,并最终对数学模型进行了实验验证.结果表明,随着喷淋量的增大,内部压强和平均换热系数都随之增大.内部压强先缓慢增长,之后迅速增加,而平均换热系数则相反,先急速增加,而后增长速率较平缓.为保证气瓶能被淬透,最小的喷水体积应不小于40 m^3/(h·m).应力结果表明,喷水量在40~290 m^3/(h·m)范围内淬火不会使瓶体发生变形.
作者
GAO Jing-na
GAO Ying
XU Qin-ran
WANG Ge
LI Qiang
高静娜;高颖;徐钦冉;王葛;李强(National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;School of Materials Science and Engineering,Hebei University of Technology,Tianjin 300130,China)
基金
Project(51674096)supported by the National Natural Science Foundation of China
Project(E2016203119)supported by Hebei Natural Science Foundation of China
Project(18211045)supported by the Key Research and Development Foundation in Hebei Province of China
