Plane mixing layers from parallel and non-parallel merging of two streams
Plane mixing layers from parallel and non-parallel merging of two streams
复制标题
来自两个流的并行和非并行合并的平面混合层
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. K. M. Sadrul Islam
中科院分区：
文献类型：
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作者：
M. Abdul Azim;A. K. M. Sadrul Islam
研究了两股流在0°和18°处合并产生的两种类型的混合层。每种混合层的流速比分别为0.7、0.8和0.9，并在6个流向位置进行了测量。在所有的情况下，边界层都是未绊倒的，最初是湍流的。两种混合层在速度比为0.7和0.8时均达到自相似状态，但在速度比为0.9时则无法达到自相似状态。混合层流动在18°处比在0°处更早地自相似。随着流速比的增大，发展距离增大，分流尾迹对混合层的发展起主导作用。非平行合并流（18°）的混合层比平行合并流（0°）的混合层在近场有更高的增长。两种类型的混合层的生长都随着速度比的增加而减小，但在高速侧扩展得更多。
Two types of mixing layers produced from two streams merging at 0° and 18° have been investigated. Each type of mixing layer was produced with velocity ratios 0.7, 0.8 and 0.9 and measurements were taken at six streamwise locations. The boundary layers were untripped and initially turbulent in all cases. Both types of mixing layers were found to attain a self-similar state for velocity ratios 0.7 and 0.8 but failed for 0.9 within the measurement domain. It appears that the mixing layer flow becomes self-similar earlier when merging at 18° than at 0°. With increasing velocity ratio, the development distance was increased and the splitter wake played a dominant role in the development of the mixing layers. The mixing layers from non-parallel merging streams (18°) were found to have higher growth in the near-field than those from parallel merging streams (0°). Both types of mixing layers were found to decrease in growth with increasing velocity ratio, though they spread more at the high-speed side.