摘要
为了研究某型APU排气腔体模态及振型,首先利用UG软件对排气腔体进行等比例建模,通过Fluent软件进行流场仿真计算,然后运用流固耦合计算分析排气腔体应力场,最后对排气腔体进行有预应力的模态分析,得到排气腔体的前八阶固有频率和振型。结果显示:排气腔体外壳体比内椎体受到更大应力,最大应力在支柱与外壳体交接处;前八阶固有频率逐渐增加,前三阶固有频率相差较小,第四阶固有频率之后显著增加;一阶模态为排气腔内椎体及支柱的扭转振型,二阶模态为内椎体及支柱y方向的弯曲振型,三阶模态为内椎体及支柱x方向的弯曲振型,四阶模态为内椎体及支柱z方向的弯曲振型;排气腔的六个支柱、支柱与外壳体交接处以及支柱与内椎体交接处有最大形变。研究结果可为APU排气腔体动力学分析及设计提供参考。
In order to study the exhaust chamber mode and vibration mode of an APU, UG software is used to carry out equal proportion parametric modeling of the exhaust chamber, then Fluent software is used to carry out flow field simulation calculation, and then the fluid-structure coupling is used to calculate and analyze the stress field. Finally, prestressed modal analysis is carried out to obtain the first eight natural frequencies and modes of the exhaust chamber. The results show that the external shell of the exhaust chamber is subjected to greater stress than the inner body, and the maximum stress is at the junction between the pillar and the outer shell. The first eight-order natural frequencies increase gradually, the first three-order natural frequencies have little difference, and the fourth order natural frequencies increase significantly. The first mode is the torsional mode of the vertebral body and the pillar in the exhaust chamber, the second mode is the bending mode of the inner vertebral body and the pillar in the y direction, the third mode is the bending mode of the inner vertebral body and the pillar in the x direction, and the fourth mode is the bending mode of the inner vertebral body and the pillar in the z direction. The six pillars of the exhaust chamber, the junction between the pillar and the outer shell, and the junction between the pillar and the inner cone have the maximum deformation. The results can provide reference for the dynamic analysis and design of APU exhaust chamber.
作者
陈振中
王震
王璐璐
张弛
CHEN Zhen-zhong;WANG Zhen;WANG Lu-lu;ZHANG Chi(School of Civil Aviation,Shenyang Aerospace University,Shenyang 110000,China;Shenyang Maintenance Base,China Southern Airlines Co.,Ltd.,Shenyang 110136,China)
出处
《西安航空学院学报》
2022年第3期13-18,共6页
Journal of Xi’an Aeronautical Institute
关键词
APU
排气腔体
模态分析
流场仿真
固有频率
振型
APU
exhaust chamber
modal analysis
flow field simulation
natural frequency
vibration mode