基于流固耦合的密炼机动力学特性分析

采用单向与双向流固耦合计算方法，对密炼机在3种不同工况下的内流场及结构场进行分析，得到流场瞬态剪切率和结构场最大应力位置与最大位移位置的等效应力，以及最大位移的波动情况。计算结果表明，流场剪切率变化由转子几何外形决定，剪切率波动主频为1倍转子棱倍频，且双向耦合计算结果高于单向耦合计算结果；2种耦合计算得到的转子棱部应力、变形分布具有一致性，波动主频以转子棱顶啮合产生的低频为主；转子外轮廓结构是最大应力波动的主要因素，最大应力位置的自转频率对应力波动影响很小，但最大位移位置的自转频率对应力波动影响较大。

Analysis of Dynamic Characteristics of Internal Mixer Based on Fluid-solid Coupling

The internal flow field and structure field of internal mixer were analyzed under three different conditions usinga calculation method based on one way and two way fluid solid coupling.The equivalent stress in the maximum stress position and maximum displacement position of structure field were achieved, and the transient shear rate and fluctuation of maximum displacement were also obtained.The results indicated that the shear rate of flow field could be determined by the geometrical shape of rotor.The main frequency of shear rate fluctuation was one times of the rotor edge frequency.The results from the two way coupling calculation were higher than those from the one way coupling one.The stress of rotor edge and the distorted distribution were consistent with the two coupling calculation, and the main frequency of the fluctuation is mainly determined by the low frequency generated by rotor edge meshing.The rotor geometry was considered as a main influence factor of maximum stress wave.The stress wave had little effect on the rotation position frequency in the maximum stress point, but it had great effect on the maximum displacement position.