基于Fluent的某型APU排气腔体内流场、温度与气动压力数值分析

Numerical analysis of flow field,temperature and aerodynamic pressure in an APU Exhaust Housing based on Fluent

为分析航空辅助动力装置(APU)排气腔体(Exhaust Housing)的气体温度、流速和气动压力因素对其部件损伤造成的影响,以某型号APU排气腔体为例,利用Solid Works构建三维实体模型并利用Design Modeler进行流体模型填充和前处理,把模型共享至Workbench中的Fluent,利用Simple压力修正算法和二阶迎风差分离散格式进行流体仿真计算。研究结果表明:在排气腔体平均进口温度为886.15 K、进口总压为109.8 kPa正常工作情况下,通过分析APU中排气腔体的气体流动特性以及温度、气动压力分布状况,得出理论损伤域与典型故障件的实际损伤部位基本吻合。研究结果对排气腔体做进一步的损伤分析和可靠性计算提供了流场环境依据。

In order to analyze the influence of the gas temperature,velocity and aerodynamic pressure of the Exhaust Housing of the Aviation Auxiliary Power Unit(APU)on its component damage,taking a certain type of APU Exhaust Housing as an example,the three-dimensional solid model was established by Solid Works and Design Modeler was used for fluid model filling and pre-processing,the model was shared to Fluent in Workbench.The fluid simulation was calculated by Simple pressure correction algorithm and second-order upwind.The research results show that the damage domain is basically consistent with the actual damage location of the typical faulty parts by analyzing the gas flow characteristics,temperature and aerodynamic pressure distribution of the exhaust chamber in the APU at normal working conditions of 886.15K average inlet temperature of the exhaust chamber and 109.8 kPa total inlet pressure.The research results provide a basis of the flow field environment for further damage analysis and reliability calculation of Exhaust Housing.