风扇叶片结冰对航空发动机不平衡响应影响研究

航空发动机风扇叶片结冰对转子不平衡具有显著的影响;并导致发动机推力的损失。针对风扇叶片结冰对转子不平衡的影响问题,采用结冰软件详细分析了商用航空发动机风扇叶片结冰情况。基于隐式动力学模型研究了风扇叶片结冰引起的整机转子不平衡。通过整机有限元模型研究了风扇叶片结冰对不同支撑轴承载荷和位移的影响;进一步研究了不平衡条件下转子和静子的间隙。研究结果表明风扇叶片结冰质量的最大工况为地面慢车状态,对一号轴承和二号轴承有一定的影响。提出的分析方法可以为风扇叶片防冰设计和验证提供指导。

The influence of fan blade icing on aero-engine rotor unbalance

The fan blade icing has significant influence on aero-engine rotor unbalance, which may induce the engine power loss. Based on the influence of fan blade icing, the mass of fan blade icing is analyzed by commercial software, and the implicit transient rotordynamic analysis is then conducted to simulate the unbalance of rotor. The influence of the icing on the rotor unbalance is analyzed in details by the whole engine finite element model. Furthermore, the closure of rotor and stator is analyzed, and the most critical condition of fan blade icing is obtained. The results show that the most critical condition of fan blade is idle, and there are influences on the 1# bearing and 2# bearing. This work provides useful design and test guidance for the fan blade icing.