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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.
The jet flow velocity of 3.39 ~ 26.8 m · s -1, Reynolds number of 12808 ~ 117340, water flow density of 978.7 ~ 6751.5 L · (m) were measured by the special roll-shaped jet quenching test equipment and the multi-channel steel temperature recorder. ~ 2 · min -1), the cooling curve of 84 mm thick steel plate was obtained. Then the wall temperature and heat flux density of the high temperature steel plate during quenching process were calculated based on the heat transfer correction method, and the boiling curve was drawn. The results show that the parameters such as jet velocity and water flow density affect the heat transfer mechanism in the stagnant zone and the parallel flow zone on the steel plate surface and thus affect the maximum heat flux distribution.When the jet velocity is low, The phenomenon of mixed heat transfer and “heat flux density shoulder” were observed in the parallel flow area of the wall. With the increase of the jet velocity, the membrane boiling heat transfer mechanism disappeared and the maximum heat flux density moved to lower wall superheat. Steel quenching process temperature field calculation and organizational performance regulation provide useful help.