论文部分内容阅读
通过水模型试验和数值模拟,研究了不同湍流控制器下两流非对称中间包内流体流动特性。数值模拟结果表明:湍流控制器几何结构对两流非对称中间包流体流动特性有明显影响。圆形湍流控制器内流场涡心靠近底部,出口处流体流速垂直向上;中间包流场涡心靠近长水口,涡心高度与挡墙高度基本相同,中间包表面波动大,容易发生卷渣现象。非对称长方形湍流控制器底部为不对称波浪形,流场涡心靠近出口,流体以一定角度从湍流控制器出口流出;其右侧出口面积大于左侧,水口右侧流体流量大于左侧;由于增大了出口面积,出口处流体速度减小,中间包表面平稳。水模型结果表明采用非对称湍流控制器中间包两流之间的平均停留时间差比圆形湍流控制器中间包减少1/4,算术平均值增加5.3%,说明非对称湍流控制器增强了中间包去除夹杂物能力且能有效缩小两流之间流体流动的差异。
Through the water model test and numerical simulation, the fluid flow characteristics of two-flow asymmetric tundish under different turbulent flow controllers are studied. Numerical simulation results show that turbulence controller geometry has obvious influence on the fluid flow characteristics of two-flow asymmetric tundish. The turbulent flow field in the circular turbulent flow controller is close to the bottom and the fluid velocity at the outlet is vertical upward. The flow field in the tundish is close to the shroud, and the height of the vortex core is almost the same as the height of the retaining wall. The surface of the tundish fluctuates greatly, phenomenon. The bottom of the asymmetric rectangular turbulent flow controller is asymmetric wavy. The flow field is near the outlet and the fluid flows out from the outlet of the turbulence controller at an angle. The outlet area on the right side is larger than the left side and the fluid flow on the right side of the outlet is larger than the left side. Increasing the exit area, exit the fluid speed decreases, tundish surface smooth. The water model results show that the average residence time difference between two flows in the tundish with asymmetric turbulence controller is reduced by 1/4 and the arithmetic mean is increased by 5.3% compared with the turbulent controller tundish, which shows that the asymmetric turbulence controller enhances the tundish The ability to remove inclusions and effectively reduce the difference in fluid flow between two streams.