纺粘非织造窄狭缝牵伸器喷射流场的研究与分析

Analyse and study on of jet flow field of the narrow slot passage of drafting assembly in spunbonding process

建立了纺粘窄狭缝牵伸器喷射流场的理论模型,采用有限差分法对该模型求解,采用SIMPLE算法求解速度和压力耦合,用交错网格解决速度和压力的锯齿状分布问题,差分格式为二阶迎风格式,使用交替方向的逐线TDMA方法求得差分方程。数值计算得到了气流速度在x方向上的分量,与实验结果吻合较好。通过对几种纺粘牵伸器喷嘴的喷射流场进行了数值模拟,给出了相应的流场矢量图,显示了该研究在对纺粘设备进行计算机辅助设计方面的应用前景。

The theoretical model of the jet flow field of the flat narrow slot passage of drafting assembly in spanbonding process is established. The model is solved numerically with finite difference method. The preferred difference scheme for space independent variableis the second-order upwind difference scheme theme. The SIMPLE algorithim is used to solved the velocity-pressure coupling. The staggered grid is adopted to avoid the tooth-like distnibutions of the velocity pressure. The distributious of air velocity component in X direction along X-axis is obtained via numerical computation, the computation results agree with the experimentals date. The air jet flow fields of sevenal flat narrow slot passage of drafting assembly with different design parameters are simulated namericdly and the corresponding veetor diagrams of the jet flow fields are demonstrated.