Enhanced outer peaks in turbulent boundary layer using uniform blowing at moderate Reynolds number

IF 1.5 4区工程技术 Q3 MECHANICS

Journal of Turbulence Pub Date : 2022-01-18 DOI:10.1080/14685248.2021.2014058

Gazi Hasanuzzaman, S. Merbold, V. Motuz, C. Egbers

引用次数: 2

Abstract

Uniform blowing through a permeable surface acts as an active flow control method in wall bounded flows. Such control technique was investigated in a zero pressure gradient turbulent boundary layer over a flat plate. Measurement data were obtained with the help of Laser Doppler Anemometry technique. Besides the drag reduction characteristics of such flow control method, time averaged measurement of stream-wise and wall-normal velocity components was taken at Reynolds number based on momentum thickness ( ) of 1100–3670. Due to the difference in surface condition with and without blowing, mean properties of the boundary condition at wall influence the flow properties when scaled with outer scaling properties. Enhanced turbulence is observed in Reynolds stresses using statistical analysis including the thickening of the boundary layer.

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中等雷诺数均匀吹风增强湍流边界层外峰

在有壁流动中，通过可渗透表面的均匀吹风是一种主动的流动控制方法。在平板上的零压力梯度湍流边界层中研究了这种控制技术。测量数据是在激光多普勒风速测量技术的帮助下获得的。除了这种流量控制方法的减阻特性外，在基于1100–3670动量厚度（）的雷诺数下，对流向和壁面法向速度分量进行了时间平均测量。由于吹扫和不吹扫时表面条件的差异，当使用外部缩放特性缩放时，壁面边界条件的平均特性会影响流动特性。使用包括边界层增厚在内的统计分析，在雷诺应力中观察到湍流增强。

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.