基于POD方法的复杂外形飞行器热环境快速预测方法

Fast aeroheating prediction method for complex shape vehicles based on proper orthogonal decomposition

使用CFD数值方法获得三维热环境数据库,利用本征正交分解对CFD数据库进行降阶处理,结合相应的基系数插值方法,快速预测出未知状态下满足精度要求的表面热环境参数。以Hermes外形为研究对象,建立热环境数据库,使用本文提出的方法预测未知来流状态下模型表面热流,并和CFD结果进行对比。结果表明,该方法可大幅提高计算效率,不损失预测精度。分析了数据库包络性对重构精度的影响。实现了沿给定弹道的三维热环境快速预测。该方法能够反映真实的热流空间分布特征,快速获得精确的激波干扰区热流,有力地弥补了工程算法的不足。

Based on three dimensional aeroheating database calculated by Computational Fluid Dynamics(CFD)and degenerated by Proper Orthogonal Decomposition(POD),the aeroheating parameters in unspecified flow conditions were rapidly predicted by a proper interpolation method.The heat flux was solved by the current method for the Hermes configuration.The result proves that the proposed method,compared with CFD methods,can greatly improve efficiency without losing accuracy.The aeroheating along agiven trajectory was predicted.The result shows that the proposed method can be applied to provide a relatively realistic aeroheating distribution on the surface of a whole vehicle,including the interfering regions of shocks.The proposed method overcomes the disadvantages in current empirical methods.