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采用数值计算软件CFX和Ansys对离心风机叶轮进行了流固耦合模拟研究,对叶轮的强度、模态和振动特性进行了计算和分析.结果表明:考虑流固耦合作用后,风机的气动性能几乎没有变化,但是叶轮最大总变形量减小2.5%,最大等效应力增大3.6%;考虑预应力效应后,叶轮的固有频率提高,且不同阶次条件下的提高幅度不同;在稳定运行工况下,叶轮周围气流压力的主要脉动频率与叶片通过频率相同;叶轮的固有频率部分落入局部共振区域,该区域的等效应力远小于叶轮材料的疲劳极限,不会导致叶轮疲劳破坏.
The numerical simulation software CFX and Ansys were used to simulate the centrifugal fan impeller, and the strength, mode and vibration characteristics of the impeller were calculated and analyzed.The results show that the aerodynamic performance of the centrifugal fan is nearly However, the maximum total deformation of the impeller decreased by 2.5% and the maximum equivalent stress increased by 3.6%. After considering the prestressing effect, the natural frequency of the impeller increased and the range of increase under different orders was different. The main pulsating frequency of the airflow pressure around the impeller is the same as the blade passing frequency. The natural frequency of the impeller partially falls into the local resonance region. The equivalent stress in this region is far less than the fatigue limit of the impeller, which will not lead to fatigue failure of the impeller.