Influence of core box vents distribution on flow dynamics of core shooting process based on experiment and numerical simulation
Influence of core box vents distribution on flow dynamics of core shooting process based on experiment and numerical simulation
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DOI：
10.1007/s41230-016-5105-z
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发表时间：
2016-03
期刊：
影响因子：
1.6
通讯作者：
Chang-jiang Ni;Gao-chun Lu;Qing-dong Zhang;T. Jing;Jun-jiao Wu;Lin-long Yang;Qin-fang Wu
中科院分区：
文献类型：
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作者：
Chang-jiang Ni;Gao-chun Lu;Qing-dong Zhang;T. Jing;Jun-jiao Wu;Lin-long Yang;Qin-fang Wu
射芯过程对砂芯的质量起着决定性的作用，而芯盒通风口的分布是决定射芯效果的重要因素之一。通过对透明芯盒、高速摄像机和测压系统的现场实验观测，研究了芯盒排气口分布对射芯过程流动动力学的影响。重点研究了不同排气口分布对砂土流动特性和压力曲线的影响。同时考虑动应力和摩擦应力，建立了描述固相内部动量传递的动摩擦本构模型。然后进行了双流体模型(TFM)模拟，实验结果与模拟结果在沙子的流动特性和压力曲线上都得到了很好的吻合。研究发现，排气口的分布直接影响芯盒内不同位置的压差，决定了砂粒所受的浮力，并对芯砂的充填过程产生显著影响。
Core shooting process plays a decisive role in the quality of sand cores, and core box vents distribution is one of the most important factor determining the effectiveness of core shooting process. In this paper, the influence of core box vents distribution on the flow dynamics of core shooting process was investigated based on in situ experimental observations with transparent core box, high-speed camera and pressure measuring system. Attention was focused on the variation of both the flow behavior of sand and pressure curves due to different vents distribution. Taking both kinetic and frictional stress into account, a kinetic-frictional constitutive model was established to describe the internal momentum transfer in the solid phase. Two-fluid model (TFM) simulation was then performed and good agreement was achieved between the experimental and simulated results on both the flow behavior of sand and the pressure curves. It was found that vents distribution has direct effect on the pressure difference of different locations in the core box, which determines the buoyancy force exerting on the sand particles and significantly influences the filling process of core sand.