Turbulence characteristics in a weir-orifice-slot combined fishway with an identical layout

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2022-05-31 DOI:10.1080/14685248.2022.2071431

Z. Dong, Jianli Tong, Zhou Huang

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引用次数: 2

Abstract

A combined fishway containing notched weir, central orifice and vertical slot with an identical layout was designed, and its turbulence characteristics were experimentally studied. An acoustic Doppler velocimetry (ADV) was used to measure three-dimensional velocity. Flow regime, average velocity, turbulence intensity, Reynolds stress, power frequency-spectrum, correlation function, turbulence scale were analysed. The experimental results showed the combined fishway was of remarkable three-dimensional flow structures. Longitudinal velocity exhibited obvious extreme value region on the horizontal plane. Extreme values of longitudinal turbulence intensity were concentrated mainly on the mixing region between weir flow and orifice jet, as well as the vertical slot wall jet region, extreme value region of transverse turbulence intensity occurred on the central plane of orifice jet, and extreme values of vertical turbulence intensity were scattered. Reynolds stress extreme value occurred mainly in the convergent zone of multiple jets. Dominant frequency of power frequency-spectrum was highest for notched weir and lowest for vertical slot. Longitudinal velocity fluctuation exhibited a correlation with time, which was characterised by dominant frequency. Turbulence scales showed eddy structures were related to flow zones.

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相同布置的堰孔槽组合鱼道中的湍流特性

设计了一种由缺口堰、中心孔和垂直槽组成的相同布置的组合式鱼道，并对其湍流特性进行了实验研究。声学多普勒测速仪（ADV）用于测量三维速度。分析了流态、平均速度、湍流强度、雷诺应力、功率频谱、相关函数、湍流尺度。实验结果表明，组合鱼道具有显著的三维流动结构。纵向速度在水平面上表现出明显的极值区。纵向湍流强度极值主要集中在堰流与孔口射流的混合区，以及垂直槽壁射流区，横向湍流强度极值区出现在孔口射流的中心面，垂直湍流强度极值分散。雷诺应力极值主要出现在多股射流的收敛区。缺口堰的功率频谱主频最高，垂直槽的主频最低。纵向速度波动表现出与时间的相关性，其特征是主频。湍流尺度显示涡流结构与流动区有关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Turbulence 物理-力学

CiteScore

3.90

自引率

5.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Turbulence is a physical phenomenon occurring in most fluid flows, and is a major research topic at the cutting edge of science and technology. Journal of Turbulence ( JoT) is a digital forum for disseminating new theoretical, numerical and experimental knowledge aimed at understanding, predicting and controlling fluid turbulence. JoT provides a common venue for communicating advances of fundamental and applied character across the many disciplines in which turbulence plays a vital role. Examples include turbulence arising in engineering fluid dynamics (aerodynamics and hydrodynamics, particulate and multi-phase flows, acoustics, hydraulics, combustion, aeroelasticity, transitional flows, turbo-machinery, heat transfer), geophysical fluid dynamics (environmental flows, oceanography, meteorology), in physics (magnetohydrodynamics and fusion, astrophysics, cryogenic and quantum fluids), and mathematics (turbulence from PDE’s, model systems). The multimedia capabilities offered by this electronic journal (including free colour images and video movies), provide a unique opportunity for disseminating turbulence research in visually impressive ways.