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首页> 外文期刊>Journal of visualization >Visualization of aluminum dust flame propagation in a square-section tube: comparison of schlieren, shadowgraphy and direct visualization techniques
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Visualization of aluminum dust flame propagation in a square-section tube: comparison of schlieren, shadowgraphy and direct visualization techniques

机译：方截面管中铝粉火焰传播的可视化：Schlieren，Shaplography和直接可视化技术的比较

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This paper presents the results of aluminum dust flame propagation inside a vertical prototype of 700 mm height and 150 × 150 mm square cross section. The study considers three visualization techniques. At first, direct visualization is employed to record the flame light with high speed camera. Special attention is given to collect images without saturation. This is especially important with aluminum flames as they are very luminous. To ensure that the exact delimitation of the flame is well defined, two additional optical techniques have been implemented: schlieren and shadowgraphy. For each explosion test, these three techniques were used simultaneously to compare the flame propagation and the burning velocity. The first one corresponds to the flame speed in the laboratory referential, determined from the obtained images, while the burning velocity corresponds to the consumption rate of the reactants by the flame front. The method used for the determination of burning velocity from the images obtained is exposed. A pulsating behavior of the light emitted by the flame is observed with the direct visualization technique. This behavior confused the determination of the flame front. This contour is easier to define with shadowgraphy images. Nevertheless, results of flame front propagation velocity are close for each technique. Burning velocity is then determined only from direct visualization and shadowgraphy images, to avoid uncertainties due to flame contour detection from schlieren images. Again, results of burning velocity are fairly close for both techniques.
机译：本文介绍了700毫米高度和150×150mm方横截面的垂直原型内铝粉火焰传播的结果。该研究考虑了三种可视化技术。首先，采用直接可视化来记录具有高速相机的火焰光。特别注意在没有饱和的情况下收集图像。这与铝火焰尤其重要，因为它们非常明亮。为了确保燃烧的精确界定很好，已经实施了两种额外的光学技术：Schlieren和Shadoshight。对于每个爆炸测试，同时使用这三种技术以比较火焰传播和燃烧速度。第一个对应于从所获得的图像确定的实验室参考的火焰速度，而燃烧速度对应于火焰前部的反应物的消耗率。用于确定从获得的图像确定燃烧速度的方法。通过直接可视化技术观察由火焰发出的光的脉动行为。这种行为困惑了火焰前面的确定。使用Shadosuge图像更容易定义此轮廓。然而，火焰前传播速度的结果对于每种技术接近。然后仅从直接可视化和影像图像确定燃烧速度，以避免由于来自Schlieren图像的火焰轮廓检测而导致的不确定性。同样，燃烧速度的结果对于两种技术相当接近。

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