非对称温度场对高压转子系统碰摩响应的影响

实际作业的转子系统在发生碰摩故障的同时，经常要承受非对称、非稳定温度场的作用，势必要改变转子系统的碰摩响应特性。以某型航空发动机高压转子系统为研究对象，建立了高压转子停车后自然对流的流-热耦合模型，研究了高压转子不同停车时刻自然对流的流体速度和温度分布。在此基础上，建立了非对称温度作用下具有多自由度的连续转子碰摩响应的有限单元模型，对多种忽略和考虑自然对流温度场影响的碰摩响应结果进行了对比研究。结果表明，当考虑停车温度场影响时，高压转子的碰摩响应增大了系统振动响应的振幅，改变了轴心轨迹的分布，频谱图上的出现了丰富的由碰摩力和非对称温度场所激发的频率成分，振动情况更加复杂。

Effect of non-symmetric temperature field on the rubbing response of a high pressure rotor system

When the rubbing fault is occurred in the rotor system during practical operation, it is often endured the effect of asymmetric and non-steady temperature fields, which must changed the rubbing response characteristics of the rotor. In this paper, the flow and heat model of high pressure rotor (HPR) was established in condition of nature convection at different parking times. The flow and temperature fields of the HPR were studied by using CFD. Moreover, the continuous finite element model with multiple nodes of the rotor system was established with considering the asymmetric temperature effect. Comparison of different models between ignoring and considering temperature fields were employed in detail. The calculated results show that when the parking temperature field is considered for the HPR, the vibration amplitudes are increased and the orbits become disordered. In the frequency spectrum, there are abundance frequency components inspirited by temperature and rubbing force and the vibration characteristics considering temperature effect are more complicated than ignoring it for the HPR.