Turbulence and self-similarity in highly aerated shear flows: The stable hydraulic jump
Turbulence and self-similarity in highly aerated shear flows: The stable hydraulic jump
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DOI：
10.1016/j.ijmultiphaseflow.2020.103316
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发表时间：
2020-08-01
影响因子：
3.8
通讯作者：
Valero, D.
中科院分区：
文献类型：
--
作者：
Kramer, M.;Valero, D.
水跃经常在自然和人为环境中遇到。从超临界流到亚临界流的过渡涉及大的能量耗散率和大量的空气夹带，从而阻止了双相流测量仪器的使用。本文介绍了一个稳定的水跃的弗劳德数为4.25的实验研究，利用新的侵入式相位检测探头技术和基于图像的测速从侧面的角度来看。得到了跳跃冲击区和滚柱区的湍流估计，包括雷诺应力、湍流积分尺度和速度脉动谱。速度谱满足一个-5/3斜率的惯性子范围，尽管高曝气的流动。总体而言，收集的数据对于高保真数值模型验证特别感兴趣，该研究代表了多相流最新实验发展所实现的空气-水流研究的进步。(C)2020爱思唯尔有限公司版权所有。
Hydraulic jumps are oftentimes encountered in natural and human-made environments. The transition from supercritical to subcritical flow involves large energy dissipation rates and substantial air entrainment, preventing the use of monophasic flow measurement instrumentation. This paper presents an experimental study of a stable hydraulic jump with a Froude number of 4.25, utilizing novel intrusive phase-detection probe techniques and image-based velocimetry from a side perspective. Turbulence estimations were obtained for the impinging region and the roller region of the jump including Reynolds stresses, turbulent integral scales and velocity fluctuation spectra. The velocity spectra fulfilled a - 5/3 slope in the inertial subrange, despite the high aeration of the flow. Overall, the collected data is of particular interest for high-fidelity numerical model validation and the study represents an advancement in air-water flow research enabled by the latest experimental developments for multiphase flows. (C) 2020 Elsevier Ltd. All rights reserved.