从流场干涉图定量计算冲击波传播速度和压力

QUANTITATIVE CALCULATION OF PROPAGATION VELOCITY AND PRESSURE OF SHOCK WAVES FROM THE INTERFEROGRAMS OF FLOW FIELD

研究了含冲击波流场干涉图的图像处理方法。首先利用快速条纹细化算法细化干涉条纹,并利用条纹追踪算法提取冲击波波阵面,然后根据配准算法把序列冲击波波阵面配准在同一幅画面上。根据上述算法,在PC-VISION100图像处理机上开发了应用软件。实验结果表明,该方法不但可用于从流场干涉图中提取冲击波波阵面,更重要的是可用于从含冲击波流场干涉图中定量计算冲击波的传播速度和压力分布。

In this paper,the image processing method of flow field interferograms containing shock waves has been investigated. In the first,a rapid fringe thinning algorithm is used to thin fringes and a fringes tracing algorithm is used to extract shock wave-fronts,then a registering algorithm is used to register time-serial shock wave-fronts onto a single image. An applicable software based on the methods mentioned above is developed for use with the PC-VISION 100 image processing system. The experimental results show that the method not only can be used to extract shock wave-fronts but also can be used to calculate the propagation velocity and pressure distribution of shock waves from the interferograms of transient flow field.