Roughness Modeling for Turbomachinery
Roughness Modeling for Turbomachinery
复制标题
涡轮机械的粗糙度建模
DOI：
10.1115/gt2011-45424
复制
发表时间：
2011
影响因子：
4.1
通讯作者：
E. Kügeler
中科院分区：
文献类型：
--
作者：
A. Fiala;E. Kügeler
粗糙度建模的基本概念得到了进一步的探索和发展。对分布粗糙度对充分发展的湍流边界层的影响、对转捩的可能影响以及局部展向粗糙度对转捩的作用机理有了基本的认识。与在VKI研究的TATMo涡轮机叶栅相比，对展向粗糙度元素进行了改进预测。三维计算记录了两种不同转捩模型下所有雷诺数的展向粗糙度与T106C测量值的比较情况。额外的验证工作显示了粗糙度元件的高度、位置和形状对节距平均损失和中跨出口角影响的准确行为的再现。除了正确再现展向粗糙度单元的流量外，正确评估工业布局表面的分布粗糙度也很重要。由于在所有表面上非常靠近壁的高网格分辨率并不总是可能的，因此可以借助壁函数来解决该问题。应用结果证明了管机械粗糙壁函数建模的重要性。版权所有© 2011 by ASME
Fundamental concepts for roughness modeling have been further explored and advanced. A basic understanding of the effect of distributed roughness on fully developed turbulent boundary layer, its possible influence on transition, and the mechanism of local spanwise roughness on transition has been achieved. Predictions with a refinement around a spanwise roughness element have been conducted in comparison to TATMo’s turbine cascade investigated at VKI. 3d-computations document the status in comparison to the T106C measurements with spanwise roughness for all Reynolds-numbers with two different transition models. Additional validation work shows the reproduction of accurate behavior of influence of height, location, and shape of the roughness element on pitchwise averaged loss and exit angle at midspan. Beside the correct reproduction of flow quantities for the spanwise roughness element, the right assessment of distributed roughness on surfaces of an industrial configuration is important. Because a high grid resolution very near the wall on all surfaces is not always possible, the problem can be solved with the help of wall-functions. The results of the application document the significance of rough wall-function modeling for tubomachinery.Copyright © 2011 by ASME