基于Kriging模型的数据拟合及多场耦合动力学特性分析

航空发动机日益向高负荷、高效率和高可靠性的趋势发展,使得多物理场耦合问题越来越受到重视.以某型航空发动机压气机的叶盘系统为研究对象,采用循环对称分析法,建立了其单扇区三维流场和结构模型.考虑前一级静叶尾迹的影响,模拟了压气机内部的三维流场.基于Kriging模型实现了流场气动、温度载荷向结构场的传递,并讨论了气动、温度、离心力的耦合作用对压气机叶盘系统的疲劳寿命的影响.结果表明:利用Kriging模型进行多场耦合界面载荷数据的传递可以满足多场耦合动力学的计算要求.在低压压气机中,离心力载荷对叶盘系统的变形、应力起到主要作用,气动压强、温度载荷引起的弯曲应力可以抵消一部分离心力载荷引起的弯曲应力,但温度载荷会使得叶盘系统的最大变形增加.

Multi-field Coupling Dynamic Characteristics and Data Fitting Based on Kriging Model

Aero-engine is increasingly to face the trend of higher load， efficiency and reliability， so that multi-field coupling problems are taken more and more attention. This research took the semal system of an aero-engine compressor as the research object， 3D flow field in the single sector and structural models were established by the method of cyclic symmetric. Considering the influence of former stator wakes， compressor flow field was simulated. Based on the Kriging model， load transfer of aerodynamic pressure and temperature achieved from flow field to blade structure. Then the coupling effects of aerodynamic pressure， temperature and centrifugal stress on compressor fatigue life were discussed. The results show that the load transfer with the Kriging model can meet the requirement of multi-field coupling dynamic calculation. In the low pressure compressor， centrifugal force plays a major role on deformation and stress of semal system， and bending stress induced by aerodynamic pressure and temperature can counteract part of bending stress induced by centrifugal force. However， temperature load makes the maximal deformation of blade-disc system increase.