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在考虑耦合流场与旋转预应力条件下,建立了对应的叶片流固耦合系统的动力特性方程.采用ANSYS与FLUENT对整体叶片的耦合模态进行了计算,并利用实验获得气流压力脉动数据,对叶片振动进行了瞬态分析.结果表明:在旋转预应力与耦合流场压力作用下,叶片模态频率约有9 Hz的上升,模态振型的最大位移位置点转移,振动方向改变,前三阶相对振幅分别从29.128,19.400,44.566下降到28.945,19.285,44.562;叶片最大变形和加速度位于前缘的上端,最大应力点集中在叶片根部一侧.
Under the condition of coupled flow field and rotating prestress, the corresponding dynamic equations of the fluid-structure interaction system are established. Coupling modes of the whole blade are calculated by ANSYS and FLUENT, and the pressure pulsation data of the flow are obtained by experiments. The transient vibration analysis of the blade is carried out. The results show that the blade mode frequency increases about 9 Hz with the rotational prestress and the coupled flow field pressure. The maximum displacement of the mode shape changes and the vibration direction changes. The first three orders of relative amplitudes decreased from 29.128, 19.400 and 44.566 to 28.945, 19.285 and 44.562, respectively. The maximum deformation and acceleration of the blade were located at the top of the leading edge, and the maximum stress point was concentrated on the root side of the blade.