激光转塔跨声速流动特性及气动光学效应
收稿日期: 2024-11-04
修回日期: 2024-11-25
录用日期: 2024-12-10
网络出版日期: 2024-12-12
基金资助
西北工业大学博士论文创新基金(CX2025031)
Flow feature and aero-optical effect for laser turret in transonic flow
Received date: 2024-11-04
Revised date: 2024-11-25
Accepted date: 2024-12-10
Online published: 2024-12-12
Supported by
Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(CX2025031)
采用改进的延迟脱体涡模拟（IDDES）方法计算跨声速来流下激光转塔绕流流场，并采用几何光线追迹方法计算不同光束发射角下的气动光学效应，揭示不同流场特征结构对气动光学效应的影响。结果表明，转塔表面压力分布呈现对称的“呼吸”模态和反对称的“交替”模态两种主特征，其特征频率范围分别为0.26~0.41和0.11~0.22，这两种主特征在频域中呈现出连贯性。转塔阻力的波动主要由剪切层振荡导致，侧向力的波动主要由激波抖动导致，而轴向力的波动则受激波抖动和剪切层振荡共同作用和影响。光束穿过附着流区域时的高阶光程差较小且波动幅值很小，而光束穿过激波区域和湍流尾迹区时的高阶光程差很大，其时均高阶光程差约为附着流区域的4倍，而其峰值高阶光程差则是附着流区域的13倍。通过本征正交分解（POD）分析发现，光束穿过剪切层和湍流尾迹涡后的高阶光程差各阶模态能量分布近似，而光束穿过激波后的光程差能量分布集中在前5阶模态。
关键词： 改进的延迟脱体涡模拟; 跨声速流动; 气动光学效应; 本征正交分解; 动力学模态分解
谭小童 , 许和勇 . 激光转塔跨声速流动特性及气动光学效应[J]. 航空学报, 2025 , 46(14) : 131493 -131493 . DOI: 10.7527/S1000-6893.2024.31493
Improved Delayed Detached Eddy Simulation （IDDES） is used to calculate the flow field around the turret in transonic flow. The ray tracing method is employed to calculate the aero-optical effect at different beam emission angles. The aero-optical effect affected by different flow structures is analyzed. The results indicate that the pressure distribution on the turret exhibits two main characteristics： a symmetric “breathing mode” and an antisymmetric “shifting mode”. Their peak frequency are at 0.26–0.41 and 0.11–0.22， respectively， and these two main features exhibit coherence in the frequency. The drag force of the turret is primarily determined by shear layer oscillation， the lateral force is largely due to the shock wave jitter， and the axial force is influenced by both shock wave jitter and shear layer oscillation. The high-order Optical Path Difference （OPD） is relatively small with little fluctuation when the beam passes through the attached flow region. However， when the beam traverses the shock wave region and the turbulent wake zone， the high-order OPD is significantly large， with the time-averaged OPD being about four times that of the attached flow region， and the peak OPD being 13 times greater than that of the attached flow. The high-order OPD of the beam passing through the shear layer and turbulent wake vortices shows similar energy ratio using Proper Orthogonal Decomposition （POD） analysis. In contrast， the OPD energy of beams passing through the shock wave is more concentrated in the first five modes.
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