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首页> 外文期刊>International Journal of Heat and Mass Transfer >Measurements in three-dimensional laminar separated flow
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Measurements in three-dimensional laminar separated flow

机译：三维层流分离流中的测量

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摘要

Velocity measurements are reported for three-dimensional laminar separated airflow adjacent to a backward-facing step using two-component laser Doppler velocimeter. The backward-facing step, with a height of S = 1.0 cm, is mounted in a rectangular duct that has an upstream height of h = 0.98 cm, downstream height of H = 2 cm, and a width of W = 8 cm. This geometry provides an aspect ratio of AR = 8 and an expansion ratio of ER = 2.02. The flow measurements covered a Reynolds number range between 98.5 ≤ Re ≤ 525. Measurements of velocity distributions reveal that a swirling "jet-like" flow develops near the sidewall in the separating shear layer, and the impingement of that flow on the stepped wall causes a minimum to develop in the spanwise distribution of the reattachment region. Reverse and recirculation flow regions develop adjacent to both the sidewall and the step, and these regions increase in size as the Reynolds number increases. Velocity distributions that were measured at various planes downstream from the step are presented, and predictions compare favorably with these measurements. The results show some interesting flow behaviors that could not be deduced from two-dimensional studies.
机译：使用两分量激光多普勒测速仪报告了与向后步骤相邻的三维层流分离气流的速度测量结果。高度为S = 1.0 cm的朝后步骤安装在矩形管道中，该矩形管道的上游高度为h = 0.98 cm，下游高度为H = 2 cm，宽度为W = 8 cm。这种几何形状的纵横比为AR = 8，扩展比为ER = 2.02。流量测量的雷诺数范围在98.5≤Re≤525之间。速度分布的测量结果表明，在分离剪切层的侧壁附近形成了旋涡状的“喷射状”流，并且该流撞击在阶梯状壁上导致在重新连接区域的翼展方向分布中形成的最小值。回流和再循环流动区域在侧壁和台阶附近都发展，并且这些区域的尺寸随着雷诺数的增加而增加。给出了在台阶下游的各个平面处测量的速度分布，并且预测与这些测量结果相比具有优势。结果显示了一些有趣的流动行为，这些行为不能从二维研究中得出。

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