发动机流道气动分析的上下游边界替代降阶模型

为了解决航空发动机流道内上下游干涉带来的计算量大的问题,提出了一种边界替代降阶模型方法。该方法辨识出研究流域与相邻的上下游流域交界面的气动力降阶模型,并耦合到该研究流域仿真模型的交界面上,用以表征上下游对该流域的影响,由此将多流域计算转化为单流域计算,同时又考虑了上下游的影响。采用一阶Volterra级数降阶模型实现了该方法。结果表明,采用本文方法和所有流域都采用CFD得到的压力和速度一致;本文方法所用的网格更少,可以加速收敛和提高计算速度。

Boundary ROM method for replacing upstream or downstream domains in aeroengine flow passage aerodynamic analysis

To release the computational duties involving the upstream-downstream interaction in aeroengine flow passage simulations,a boundary ROM method is proposed.In the method,a ROM is identified for the upstream or downstream interface between the flow domain concerned and its upstream or downstream neighbor.The ROM is coupled with the concerned flow domain at the interface to include the upstream-downstream interaction effects.By these works,the multiple flow domains problem is converted into a single-domain problem while considering upstream-downstream interactions.One order Volterra series is used to build the ROM proposed.The results of an example show that the pressures and velocities calculated by the proposed method are the same as these fully calculated by a CFD method.The results also imply that the mesh used in the proposed method is less than the full CFD method and the proposed method is easer to converge and more efficient.