特厚钢板阵列射流淬火的表面换热

发布时间：2018-04-01 16:01

本文选题：特厚钢板　切入点：多束阵列射流　出处：《工程科学学报》2017年09期

【摘要】：采用特厚钢板专用辊式射流淬火试验装置和多通道钢板温度记录仪,测试出射流速度3.39~26.8 m·s~(-1)、雷诺数12808~117340、水流密度978.7~6751.5 L·(m~2·min)~(-1)条件下,84 mm厚钢板淬火冷却曲线;进而基于反传热修正方法计算高温钢板淬火过程壁面温度和热流密度,描绘出沸腾曲线,分析多束圆孔阵列射流对特厚钢板淬火表面换热的影响.结果表明:射流速度、水流密度等参数影响钢板表面射流滞止区和平行流区换热机制,进而影响最大热流密度分布.射流速度较低时,壁面平行流区观察到混合换热和"热流密度肩"现象;随射流速度增大,膜沸腾换热机制消失,最大热流密度移至较低壁面过热度处.相关研究将对特厚钢板淬火过程温度场计算和组织性能调控提供有益的帮助.
[Abstract]:Based on the reverse heat transfer correction method, the wall temperature and heat flux during quenching process of high temperature steel plate are calculated, the boiling curve is described, and the effect of multi-beam circular hole array jet on the heat transfer on the quenched surface of ultra-thick steel plate is analyzed.The results show that the jet velocity and water density influence the heat transfer mechanism in the jet lag zone and the parallel flow zone on the steel plate surface, and then affect the maximum heat flux distribution.The mixing heat transfer and "heat flux shoulder" phenomenon were observed in the wall parallel flow region at low jet velocity, and the film boiling heat transfer mechanism disappeared with the increase of jet velocity, and the maximum heat flux moved to the lower wall superheat degree.The relevant research will be helpful to the calculation of temperature field and the control of microstructure and properties during quenching process of super thick steel plate.
【作者单位】：东北大学轧制技术及连轧自动化国家重点实验室;
【基金】：东北大学基本科研业务费重大科技创新资助项目(N160708001)
【分类号】：TG162.83

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