轴对称流场的计算流动显示算法

讨论了全息干涉、纹影、阴影的计算光学原理 ,对数值计算的结果进行图形处理以模拟光学仪器的工作过程。针对轴对称流场的特殊性 ,对三维的光程积分计算进行简化 ,采用环带法用二维的计算网格计算出三维的沿光线的积分结果 ,发展了一套轴对称流场的计算流动显示的快速算法。通过计算流场图像与试验流场图像的直接比较 ,可以验证数值计算的有效性。示例给出了弹道靶中高超声速钝锥流动的应用

Computational Flow Imaging of Axis-symmetric Flow

The optical modeling of computational shadowgraph, schlieren and interferometry is discussed. The results of CFD (computational fluid dynamics) and transmission of optical waves through theoretical flowfield are used to generate digital pictures that simulate real observations. Concerning the specialty of the axis symmetric flow, the integral calculation in the equations of the optical model is simplified. A ring belt method is developed to obtain three dimensional integral results from two dimensional CFD results to process graphic rendering of computational flow imaging for axis symmetric flow. This technology provides a better insight into the flow physics and is extremely useful to experimentally validate CFD codes. An example for hypersonic blunted cone flow in ballistic range is illustrated.