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瞬态三维流场的层析,需要拍摄多方向干涉图,然后利用计算机进行层析。高速摄影能够记录瞬态过程的外部形象变化,给予定性的观察而不能定量描述,即使利用纹影、阴影技术也只能给出流场冲击波的二维定性结构。人们曾利用漫射全息干涉法来获得多方向干涉图,从而进行流场的三维定量计算。在这种方法中,由于干涉条纹是空间地定域于一曲面上,从各方向难于翻拍到清晰的干涉图,观察角度由于受到测域区域的
Tomography of transient three-dimensional flow fields requires taking a multi-directional interferogram and then using a computer for tomography. High-speed photography can record the change of the external image of the transient process and give qualitative observation without quantitative description. Even if the use of the shadowing technology, the shadow technology can only give a two-dimensional qualitative structure of the shock wave of the flow field. People have used diffuse holographic interferometry to obtain a multi-directional interferogram, which allows for the three-dimensional quantitative calculation of the flow field. In this method, since the interference fringes are spatially localized on a surface, it is difficult to remake the image to a clear interference pattern in all directions. The angle of view