射流倾斜角度对热轧无缝钢管冷却均匀性的影响

为了获得射流倾斜角度对热轧无缝钢管冷却效率及均匀性的影响规律,运用Fluent软件对单股倾斜射流冲击冷却热轧无缝钢管的流动特点及传热特性进行了有限元模拟。研究了不同射流倾斜角度下无缝钢管表面剪切力、湍流动能及压力分布特点,并获得冲击点处热流量及钢管1/2厚度处温度的变化曲线。结果表明,射流倾斜角度对钢管表面剪切力、湍流动能及温度分布具有显著的影响;随着射流倾斜角度的增加,钢管表面剪切力及湍流动能非对称性逐渐增加,且在顺流方向3°附近出现最大值;从钢管1/2厚度处温度分布发现,随着射流倾斜角度的增加,换热效率及温度均匀性得到了改善,先升高后降低;通过标准差计算,当入射角θ=10°时,冲击点两侧温度均匀性最佳。

Effect of jet tilt angle on cooling uniformity of hot rolled seamless steel pipe

In order to obtain the influence of the jet tilt angle on the cooling efficiency and uniformity of the hot rolled seamless steel pipe, a finite element simulation of the flow characteristics and heat transfer characteristics of a single tilt jet cooling hot-rolled seamless steel pipe was carried out by using fluent software.The surface shear force, turbulent flow energy and pressure distribution characteristics of the seamless steel tube under different jet tilt angles were studied, and the heat flux at the impingement point and the temperature change curve at 1/2 thickness of the steel pipe were obtained. The results show that the jet tilt angle has a significant effect on the shear force, turbulent flow energy and temperature distribution of surface; with the increase of tilt angle, the asymmetry of shear force and turbulent kinetic energy gradually increases, and the maximum value appears near 3° in the downstream direction; from the temperature distribution at 1/2 thickness of steel pipe, it is found that as the tilt angle increases, the heat exchange efficiency and temperature uniformity are improved, first increasing and then decreasing; by standard deviation calculation, when the tilt angle θ=10°, the temperature uniformity on both sides of the impingement point is the best.