Two-dimensional reattaching jet flows including the effects of curvature on entrainment
Two-dimensional reattaching jet flows including the effects of curvature on entrainment
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DOI：
10.1017/s0022112063001464
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发表时间：
1963-12
影响因子：
3.7
通讯作者：
R. Sawyer
中科院分区：
文献类型：
--
作者：
R. Sawyer
本文对以前为预测平行于平板的低速紊流射流所包围的再循环流区域的平均压力和长度所作的分析作了修改，以考虑到弯曲射流两个边缘的不同卷吸率、初始混合区和再附着附近的压力。理论和实验之间的相关性得到改善。该分析已被应用到由于射流出现在一个角度的平板的流动，并给出了很好的预测的长度和平均压力的回流区的一个特定值的膨胀比参数。曲率对卷吸率有相当大的影响，但一阶混合长度理论表明，这并不一定伴随着射流速度剖面与平面射流速度剖面的显著偏差。
The analysis given previously for predicting the average pressure and length of the region of recirculating flow enclosed by a low-speed turbulent jet, issuing parallel to a flat plate, has been modified to take into account the different rates of entrainment by the two edges of the curved jet, the initial mixing region and the pressure forces near reattachment. There is improved correlation between theory and experiment. The analysis has been applied to the flow due to a jet emerging at an angle to a flat plate, and gives good prediction of the length and average pressure of the recirculation region for a particular value of an entrainment-ratio parameter. Curvature has a considerable effect on the rates of entrainment, but a first-order mixing-length theory indicates that this need not necessarily be accompanied by a marked deviation in jet velocity profile from that of a plane jet.