Numerical Predictions of the Effect of Rotation on Fluid Flow and Heat Transfer in an Engine-Similar Two-Pass Internal Cooling Channel With Smooth and Ribbed Walls
Numerical Predictions of the Effect of Rotation on Fluid Flow and Heat Transfer in an Engine-Similar Two-Pass Internal Cooling Channel With Smooth and Ribbed Walls
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DOI：
10.1115/1.4003086
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发表时间：
2010-10
影响因子：
1.7
通讯作者：
M. Schüler;H. Dreher;S. O. Neumann;B. Weigand;M. Elfert
中科院分区：
文献类型：
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作者：
M. Schüler;H. Dreher;S. O. Neumann;B. Weigand;M. Elfert
在本研究中，对一个具有与发动机相似横截面的双通道内部冷却通道进行了数值研究。该通道具有梯形入口通道、急剧的180度弯曲以及近乎矩形的出口通道。针对壁面光滑以及壁面装有45度倾斜肋片（节距/肋高 = 10，肋高/水力直径 = 0.1）的结构，在雷诺数Re = 50000的条件下进行了计算。本研究重点关注旋转对流体流动和传热的影响。所研究的旋转数为Ro = 0.0和0.10。计算是通过使用商业有限体积求解器FLUENT求解雷诺平均纳维 - 斯托克斯方程（雷诺平均纳维 - 斯托克斯方法），并采用低雷诺数剪切应力输运（SST）k - ω湍流模型来进行的。数值网格是使用POINTWISE生成的块结构六面体网格。在德国科隆航空航天中心使用粒子图像测速技术独立进行了流场测量。在光滑通道中，旋转对二次流有很大影响。特别是，旋转诱导的涡旋完全改变了流场。旋转还改变了在顶部和出口通道侧壁上的流动冲击。出口通道中的传热因旋转而发生很大变化。与光滑通道相反，旋转对带肋通道中的传热影响较小。这是由于肋片诱导出了强烈的二次流场。然而，在出口通道中，科里奥利力显著影响了肋片诱导的二次流场。旋转对传热的影响尤其在弯曲区域以及弯曲下游的第二通道中明显可见。
In the present study, a two-pass internal cooling channel with engine-similar cross-sections was investigated numerically. The channel featured a trapezoidal inlet pass, a sharp 180 deg bend, and a nearly rectangular outlet pass. Calculations were done for a configuration with smooth walls and walls equipped with 45 deg skewed ribs (P/e=10, e/dh=0.1) at a Reynolds number of Re=50,000. The present study focused on the effect of rotation on fluid flow and heat transfer. The investigated rotation numbers were Ro=0.0 and 0.10. The computations were performed by solving the Reynolds-averaged Navier–Stokes equations (Reynolds-averaged Navier–Stokes method) with the commercial finite-volume solver FLUENT using a low-Re shear stress transport (SST) k- turbulence model. The numerical grids were block-structured hexahedral meshes generated with POINTWISE. Flow field measurements were independently performed at German Aerospace Centre Cologne using particle image velocimetry. In the smooth channel, rotation had a large impact on secondary flows. Especially, rotation induced vortices completely changed the flow field. Rotation also changed flow impingement on the tip and the outlet pass sidewall. Heat transfer in the outlet pass was strongly altered by rotation. In contrast to the smooth channel, rotation showed less influence on heat transfer in the ribbed channel. This is due to a strong secondary flow field induced by the ribs. However, in the outlet pass, Coriolis forces markedly affected the rib induced secondary flow field. The influence of rotation on heat transfer was visible in particular in the bend region and in the second pass directly downstream of the bend.