基于湍流涡模型的气动光学效应影响参数分析

Analysis of influence parameters of aero-optical effects based on turbulence vortex model

湍流是流体力学中公认的难题,目前仍缺乏可靠的湍流模型对复杂流场进行准确数值预测,使真实飞行器外绕流流场对所载光学系统的气动光学效应分析相当复杂和困难。在湍流球涡模型的基础上,结合湍流物理几何特性和计算流体力学结果,引入真实流场条件,建立了一个新的气动光学效应仿真模型,分析了部分光学系统参数、流场参数对气动光学效应的影响。该仿真模型能根据不同的湍流状况调整参数,并能得到气动光学效应的多种仿真输出。结果表明,该模型能直观快速地分析气动光学效应随光学系统参数和湍流部分动力学行为的变化规律,其结论能为系统设计、试验指导和后期图像校正提供理论依据。

Turbulence is a recognized problem in fluid mechanics, there＇s still no reliable turbulence model to compute numerical simulation for complicated flow accurately. So it＇s so difficult to analyze the aerooptical effects of flow around aircraft for its onboard optical system. Combining turbulence physical and geometrical features and computational fluid dynamics results, actual turbulence condition is imported to describe a new computer model for simulating aircraft aero-optical effects on the basis of turbulence sphere model. Then the influence of some optical and turbulence parameters on aero-optical effects are analyzed. The parameters can be adjusted by the model according to different turbulence conditions, and various simulation outputs can be obtained. The results show that this model can achieve the analysis of change discipline for aero-optical effects varying with optical system parameters and some turbulence dynamics behavior fast and intuitively, and is helpful for system design, test guiding and image correction.