| 引用本文: | 冯定华,潘沙,田正雨,等.含激波流场的光线追迹方法.[J].国防科技大学学报,2010,32(1):6-10.[点击复制] |
| FENG Dinghua,PAN Sha,TIAN Zhengyu,et al.Method of Ray Tracing through Shock Wave Flow Field[J].Journal of National University of Defense Technology,2010,32(1):6-10[点击复制] |
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| 含激波流场的光线追迹方法 |
| 冯定华, 潘沙, 田正雨, 李桦 |
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(国防科技大学 航天与材料工程学院，湖南 长沙 410073)
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| 摘要: |
| 高速流场中的激波会产生明显的气动光学效应，导致光线发生偏移、聚焦等。从理论上考察了在不同入射角条件下，光线经过激波后发生角偏移量与激波强度的关系；针对通过计算流体力学得到的激波流场，提出了追迹步长根据当地折射率梯度和网格几何尺寸自适应调节的光线追迹的思想和方法，以提高追迹的精度；对所建立光线追迹方法的精度进行了考察。结果表明，所建立的光线追迹方法适用于激波流场的光线追迹，具有较高的精度。 |
| 关键词: 激波 光线追迹 步长自适应 折射率梯度 |
| DOI： |
| 投稿日期：2009-09-23 |
| 基金项目:国防科技大学优秀研究生创新资助项目(B080103) |
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| Method of Ray Tracing through Shock Wave Flow Field |
| FENG Dinghua, PAN Sha, TIAN Zhengyu, LI Hua |
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(College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| In the high speed flow field, shock wave will cause obvious aero-optics effect, which can induce the excursion and focusing of the ray and so on. In this paper, the relationships of angle excursion and shock intensity are reviewed theoretically in the condition of different incidence angles. In application to actual problem, the shock field is usually simulated by computational fluid dynamics. In order to trace the ray through the simulated shock field, an idea and the matched method are carried out, which can improve the tracing precision. In this way, the tracing step distance is aimed to be self-adaptive to local refraction index gradient and grid geometry scale. At last, the ray tracing method is validated. The result shows that the method has high precision for ray tracing in the shock field. |
| Keywords: shock wave ray tracing step self-adaptive refraction index gradient |
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