Statistical quantification of drop deformation behaviour and breakup initiation time in high speed air flow
Statistical quantification of drop deformation behaviour and breakup initiation time in high speed air flow
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DOI：
10.1299/transjsme.20-00318
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
T. Kamiya;M. Asahara;T. Miyasaka;K. Asato
中科院分区：
文献类型：
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作者：
T. Kamiya;M. Asahara;T. Miyasaka;K. Asato
本文在相同的条件下，重复拍摄了激波后高速气流中单个水滴的破碎过程。采用激光破碎法，具有较好的冲击波产生时机。对图像的强度值进行平均，以进行液滴投影、图像厚度和体积的统计量化。在早期，由平均强度分布得到的液滴投影图像的厚度和体积与从原始图像获得的液滴投影图像的厚度和体积几乎相同。此外，我们还发现，在破裂开始时，水滴投射图像体积迅速增加。因此，我们提出了一种利用液滴投影图像体积来测量破裂起始时间的方法。将该破裂起始时间与经验公式进行了比较。由此可见，本文提出的测量方法是有效的。
In this paper, single water drop breakup in a high-speed gas flow behind shock wave, which is generated by shock tube, are repeatedly photographed under the same conditions. The laser rupture method, which have good shock wave generation timing, is adopted. The intensity values of the images are averaged to conduct statistical quantification of drop projection image thickness and volume. In early stage, drop projection image thickness and volume obtained from average intensity distribution are almost the same to drop projection image thickness and volume obtained from the original image. Additionally, we found that drop projection image volume increase rapidly at the time when the breakup initiates. Therefore, we propose a measurement method of breakup initiation time by utilizing the drop projection image volume. This breakup initiation time is compared with empirical equation of initiation time. Thus, it is shown that the proposed measurement method is valid.