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An analysis of the flow downstream to a contraction in a tube with bleeding flow

机译：具有出血流动管中的凹陷下游流动的分析

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The flow downstream to a contraction in a tube with bleeding flow was investigated by numerical analysis. The bleeding flow was orthogonally induced with tube axis from circumferential entrance. In the analysis, axisymmetrical and laminar flow was assumed. The calculated results were analyzed with respect to the following three parameters. · ratio Q{sub}b/Q of bleeding flow rate Q{sub}b to that of flow from contraction Q. · relative position of reattachment point of stream from the contraction and bleeding point. · ratio d/D of diameter of the contraction d to that of downstream tube D. From the results, it was clarified that all these parameters had the influence on the flow downstream to the contraction and pressure loss caused by bleeding flow. The pressure loss by bleeding flow could be lowered by decreasing of Q{sub}b/Q, setting the bleeding point far downstream to the contraction, and by increasing of d/D. Moreover, by normalizing the dimension of settings by Reynolds number in the contraction, the similarities of flow and of pressure distribution along the tube wall were shown.
机译：通过数值分析研究了具有出血流动的管中收缩下游的流动。出血流程与管轴从圆周入口置于正交引起的。在分析中，假设轴对称和层流。关于以下三个参数分析计算结果。 ·比率Q {亚} B / Q流出流量q {sub} b从收缩q的流量q.·从收缩点和出血点重新附点的相对位置。 ·将收缩直径的D / D与下游管D的直径。从结果中澄清，所有这些参数对下游的流量的影响有影响和通过出血流动引起的压力损失。通过降低Q {Sub} B / Q，可以降低通过出血流的压力损失，将远处区域的出血点设置为收缩，并通过增加D / D。此外，通过在收缩中归一化雷诺数的设置的尺寸，示出了流动和沿管壁的压力分布的相似性。

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