Lagrangian Scaling of Turbulent Jets and Plumes with Dominant Eddies
Lagrangian Scaling of Turbulent Jets and Plumes with Dominant Eddies
复制标题
具有主涡流的湍流射流和羽流的拉格朗日标度
DOI：
10.1007/978-94-011-0918-5_4
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发表时间：
1994
影响因子：
0.5
通讯作者：
V. Chu
中科院分区：
文献类型：
--
作者：
V. Chu
本文在拉格朗日参考系中研究了喷流和羽流中湍流卷吸的过程。本文介绍了拉格朗日方法，评述了湍流运动的拉格朗日标度的实验研究。喷流和羽流的传播特征与主导涡的长度和速度尺度有关。在拉格朗日参考系中，观察到具有相似几何结构的主导涡流的湍流以几乎相同的速率扩散。与传统的欧拉方法相比，拉格朗日方法更自然地与卷吸过程相联系。
The process of turbulent entrainment in jets and plumes is examined in a Lagrangian reference frame following the motion of the dominant eddies. This paper introduces the Lagrangian method and reviews the relevent laboratory experiments for Lagrangian scaling of the turbulent motion. Spreading characteristics of jets and plumes are correlated with the length and velocity scales of the dominant eddies. In the Lagrangian reference frame, turbulent flows with dominant eddies of similar geometric structure are observed to spread with nearly identical rate. Compared with the conventional Eulerian method, the Lagrangian method is more naturally connected to the process of entrainment.