下铸过程中注管旋流定子对流场及气泡行为的影响

Effect of swirl stator in central runner on flow field and bubble behavior in uphill teeming process

提出了在下铸过程中注管内安装旋流定子产生流体旋流的方法,以此控制浇道流场状态及铸模内驼峰高度.利用水模型实验研究了中注管内定子的放置位置、扭转角度及厚度对流场和气泡行为的影响.结果表明:在中注管内放置旋流螺旋定子能产生流体旋流,并且合适的放置位置能让中注管内气液交界面最高;螺旋定子扭转角度和厚度的增大均会使流体旋流增强,气泡更容易向中注管中心聚集并上浮,气液交界面的最大深度比无螺旋定子时分别降低46.3%和43.3%,同时铸模内的驼峰高度也减小.

A swirl stator is proposed to install in the central runner during the uphill teeming process to generate swirling flow,for controlling the flow field state in the runner and the hump height in the mold.Water model experiments are carried out,in which the installation position in the central runner,the twist angle and the thickness of the stator are changed to study their influence on the flow field and the bubble behavior.The results show that the swirl stator placed in the central runner can produce swirling flow,and the proper position of the stator may lead to the highest gas⁃liquid interface level in the central runner.With the increases of the twist angle and the thickness of the swirl stator,the swirling flow is enhanced,more bubbles are forced to gather toward the center of the central runner and float upward more quickly.The maximum gas⁃liquid interface depth can be reduced by 46.3%and 43.3%respectively,compared with the case without the stator,and it also can reduce the hump height in the mold.