轧辊离心铸造钢液流动和传热的计算机数值模拟

Computer Numerical Simulation of Melt Flow and Heat Transfer in Centrifugal Casting Roller

建立了轧辊离心铸造的三维模型。利用Fluent软件对钢液的流动、传热和相变进行了模拟,得到了离心铸造过程中钢液的速度场、压力场、温度场和固液相分布规律。结果显示,在离心力和重力双重作用下,离心铸造的钢液会形成分层流动,越靠近自由表面的位置速度越大,在铸型内壁的位置沿重力方向上存在0.16 MPa的压力差;铸型与钢液接触位置有一个温度阶跃,越靠近铸型内壁的区域,凝结速度越快,并且随着时间逐渐降低;钢液在150 min时完全凝固。

A three-dimensional model of centrifugal casting rolls was established. The flow of liquid steel, heat transfer and phase transition were simulated by using the Fluent software. The velocity field, pressure field and temperature field of liquid steel and solid-liquid phase distribution in centrifugal casting process were gotten. The results show that in the dual role of the centrifugal force and gravity, the centrifugal casting of molten steel can form stratified flow, the closer the position of the free surface is, the greater the speed is. The position of the inner wall of the mould along direction of gravity has the pressure difference of 0.16 MPa; the temperature of position in mould contacting with liquid steel has a jump, the closer to the area of the mold inner wall is, the faster the coagulation is, and decreases with time. The solidification of liquid steel is competed in the 150 min.