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首页> 外文会议>41st AIAA fluid dynamics conference and exhibit 2011 >Velocity of large-scale, cavity shear layer structures through time-resolved schlieren images
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Velocity of large-scale, cavity shear layer structures through time-resolved schlieren images

机译：通过时间分辨的纹影图像分析大型空腔剪切层结构的速度

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摘要

Time-correlated schlieren photographs of a resonating cavity shear layer revealed large-scale convective structures within the shear layer. An analysis of the image time series showed that the density gradients associated with structures move across the cavity opening at a fraction of the freestream speed, typically between 0.25U_∞ and 0.6U_∞. The analysis also revealed that the typical time associated with the formation of a structure at the upstream end of the cavity and its eventual passage over the downstream edge of the cavity corresponded to an "effective" velocity around 0.4U_∞. The empirically derived Rossiter coefficient, k, in these cases typically ranged between 0.55 and 0.6. The results, therefore, contradict the dated but somewhat conventional notion that k in Rossiter's equation represents the convective velocity fraction of large-scale structures in the shear over the length of the cavity.
机译：谐振腔剪切层的与时间相关的schlieren照片揭示了剪切层内的大规模对流结构。对图像时间序列的分析表明，与结构相关的密度梯度以自由流速度的一部分（通常在0.25U_∞和0.6U_∞之间）流过腔体开口。分析还显示，与腔体上游端结构形成以及最终通过腔体下游边缘的时间有关的典型时间相当于大约0.4U_∞的“有效”速度。在这些情况下，根据经验得出的Rossiter系数k通常在0.55至0.6之间。因此，结果与过时但有些传统的观念相矛盾，后者认为Rossiter方程中的k代表了在空腔长度范围内的剪切中大型结构的对流速度分数。

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