A Flow Structure at Reattachment Region of a Two-Dimensional Backward-Facing Step by Using Advanced Multi-Point LDV
A Flow Structure at Reattachment Region of a Two-Dimensional Backward-Facing Step by Using Advanced Multi-Point LDV
复制标题
采用先进多点 LDV 的二维后向台阶再附着区域的流动结构
DOI：
10.1007/978-3-642-56963-0_10
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
M. Kumada
中科院分区：
文献类型：
--
作者：
N. Furuichi;T. Hachiga;K. Hishida;M. Kumada
用多点激光测速仪测量了二维后向台阶流的瞬时速度分布，讨论了分离剪切层的运动细节和再附着现象。结果表明，再附着现象遵循两种模式，一种是分离的剪切层再附着，另一种是分离的剪切涡再附着。由于分离剪切层中涡旋的集中，分流线会发生振荡，并具有准周期的再附着行为。
A temporal data of instantaneous velocity profile of a two-dimensional backward-facing step flow was measured by multi-point LDV, and was discussed with a special focus on the details of the motion of the separated shear layer and the phenomena of reattachment. As a result, The phenomenon of reattachment was seen to follow two patterns, one when the separated shear layer reattaches, the other when the separated shear vortex reattaches. The dividing stream line oscillates because of vortex concentration in the separated shear layer and has a quasiperiodical behavior as concerned to reattachment.