基于流固耦合的密炼机转子瞬态工作特性研究

Research on Transient Performance of Internal Mixer Rotor Based on Fluid-Structure Coupling

采用双向流固耦合计算方法,对密炼机转子系统进行瞬态模拟分析。转子应力从转子棱顶到转子根部逐渐增大,最大值出现在轴肩部位,而此部位并没有发生转子形变;最大变形出现在棱顶部位;转子棱部等效应力的最大值远小于转子轴部,最大等效应力出现在长棱和短棱相接区域;棱部最大变形的部位是流体具有最大速度的区域。通过对转子瞬态变形曲线分析发现异向转子更稳定,两种转向转子最小变形值趋势一致,但最大变形量差距较大,异向转子变形量较同向转子波动范围更小且异向转子应力分布相对集中,这也有利于提高转子的使用寿命。

The transient simulation analysis of internal mixer rotor system was carried out by using two-way fluid-structure coupling calculation method.The rotor stress increases gradually from the top of the rotor edge to the root of the rotor,and the maximum stress appears at the shoulder of the shaft,but there is no rotor deformation in this position.The maximum deformation appears at the top of the edge.The maximum equivalent stress of the rotor’s edge is far less than that of the rotor’s shaft,and the maximum equivalent stress appears in the region where the long edge and the short edge meet.The maximum deformation of the edge is the region where the fluid has the maximum velocity.By analyzing the transient deformation curve of the rotor,it is found that the opposite rotor is more stable.The trend of the minimum deformation of the two steering rotors is the same,but the difference of the maximum deformation is large.The fluctuation range of the deformation of the opposite rotor is smaller than that of the same rotor,and the stress distribution of the opposite rotor is relatively concentrated,which is also beneficial to improve the service life of the rotor.