基于CFD的地面颤振模拟试验非定常气动力重构方法研究  

Unsteady aerodynamic model reproduction method for ground flutter simulation test based on CFD

作　　者：宋巧治 王彬文[1] 李晓东[1] SONG Qiaozhi;WANG Binwen;LI Xiaodong(Laboratory of Vibration Technology for Aircraft Structures,Aircraft Strength Research Institute of China,Xi’an 710065,China)

机构地区：[1]中国飞机强度研究所飞机结构振动技术研究室,西安710065

出　　处：《振动与冲击》2022年第10期40-46,共7页Journal of Vibration and Shock

摘　　要：为满足地面颤振模拟试验中气动力计算的实时性以及插值点数量要求,提出一种基于计算流体力学(computational fluid dynamics,CFD)的非定常气动力重构方法。首先,通过模态激励的方式建立广义坐标下的气动力降阶模型(reduced order model,ROM),提高气动力计算效率;然后,利用提出的物理坐标与广义坐标物理量的转换关系将模型转换至物理坐标下,并基于优化算法对插值点进行缩聚处理;最终,采用标准模型AGARD445.6对建立的非定常气动力进行仿真。分析结果表明,基于重构的气动力模型获得的颤振边界与计算流体力学/计算固体力学(computational fluid dynamic/computational solid dynamic,CFD/CSD)直接耦合及风洞试验结果吻合较好,证实了该方案的可行性。In order to meet the requirements of real-time aerodynamic calculation and determine the number of interpolation points in ground flutter simulation test,an unsteady aerodynamic reconstruction method based on computational fluid dynamics(CFD)was proposed.Firstly,a reduced order aerodynamic model in generalized coordinates was established by means of the modal excitation method to improve the efficiency of aerodynamic calculation.Then the proposed coordinate transformation between physical and generalized coordinates was used to obtain the aerodynamic model in physical coordinates,and also the interpolation nodes were condensed through optimization.Finally,the standard model AGARD 445.6 was used to simulate the unsteady aerodynamic mode.The flutter boundary obtained from the reconstructed aerodynamic model is in good agreement with those of the direct computational fluid dynamic/computational solid dynamic(CFD/CSD)coupling result and wind tunnel test result,which proves the feasibility of the scheme.

关 键 词：地面颤振模拟试验 降阶模型(ROM) 气动力模型重构 坐标变换 

分 类 号：V215.34[航空宇航科学与技术—航空宇航推进理论与工程]