气垫式退火炉内流场的数值模拟

Numerical simulation of flow field in air-cushion annealing furnace

为了研究气垫式退火炉内工件漂浮的情况,建立了三维湍流数学模型,运用计算流体动力学(CFD)的方法得到炉内的气体流场与压力场。通过流-固耦合的方法分析在不同的边界条件下工件表面产生的压力场对其在炉内稳定漂浮的影响。应用该模型通过控制变量的方式对其他不同规格的工件达到漂浮加热的所需风速及漂浮高度进行预测。结果表明,宽度为1050 mm的铜带在上、下出风口的速度分别为4 m/s和7 m/s时,距离上喷口60~70 mm处实现无接触加热及传送。

In order to research the floating condition of workpieee in an air-cushion annealing furnace, a three-dimension turbulence mathematic model was established. Aided by the eomputational fluid method （CFD） the furnace-air field and pressure field were obtained. The surface pressure field of workpiec and the influence of the floatation stahility in different boundary conditions were analyzed by means of fluid-solid coupling method. The other kind of workpiece floating height and velocity with control variable method were predicted by applying the model. The rsults show that when the wind velocity is 4 m/s and 7 m/s at the top and bottom respectively outlet of the copper strip which the width is 1050 mm, can aehieve non-contact heating and transmission at the distance 60-70 mm from the top nozzle.