双曝光全息干涉法用于风洞中激波流场的研究

TWO-EXPOSURE HOLOGRAPHY FOR STUDY OF SHOCKWAVE FLOW GENERATED BY A MODEL IN A SUPERSONIC WIND CHANNEL

本文论述了双曝光全息干涉法在激波流场研究中的应用．对于形状不规则模型在超音速风洞中产生的激波流场，由于对这种流场进行数值计算几乎不可能，从实验上对其进行定量测量就显得尤为重要．本文很好地解决了某种不规则模型超音速激波流场的定量测量问题，获得了激波流场的有限条纹全息干涉图，并利用图象处理技术对干涉图进行了细化处理，再用人机交互的方式采集数据计算出条纹的位移量，最后用拉普拉斯变换法计算出流场的密度分布值．

This article discusses the application of two-exposure holography to study shockwave flow.For irregular models,the numerical calculation of its shockwave flow is almost impossible, the experimentally quantitative measurement of the flow is particularly important. The paper successfully resolves the measurement problem of the shockwave flow generated by a certain irregular model in a supersonic wind channel,its finite-fringe hologram is obtained,by use of image processing technology,the hologram is skeletonized,and then fringe shift amount data are collected in man-computer fashion.Finally the density distribution of the flow is given through Laplacian transform method.