Cylinder wake flow in confined channel and its active control by sweeping jets

IF 2.3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
Jinsheng Song, Zihao Qiu, Yingzheng Liu, Xin Wen
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Abstract

The wake dynamics of the flow past a confined circular cylinder and its active control by sweeping jets (SWJs) and steady jets (SJs) positioned at the front stagnation points were experimentally investigated using particle image velocimetry and pressure measurements. Experiments were conducted across a range of Reynolds numbers (Re, based on the incoming flow velocity and the cylinder diameter) from 10,000 to 45,000 and blockage ratios (\(\beta\)) of \(1/2\), \(1/3\), \(1/4\), and \(1/5\). A comprehensive comparison between the current results and existing literature on natural flow dynamics fills the knowledge gap and reveals that confinement gradually reduces the time-average pressure coefficient (\(C_{{\text{p}}}\)) and increases the drag coefficient (\(C_{{\text{D}}}\)) and Strouhal number (St). The interaction between the wake and lateral wall shear layer gradually increased as \(\beta\) increased. Both SWJs and SJs effectively suppressed wake fluctuations, and the statistical characteristics of the flow field and proper orthogonal decomposition analysis indicated a consistent flow control mechanism between the two methods. However, the SJs introduced external fluctuations and unbalanced forces in the forward flow field, resulting in a wake flow asymmetry. By contrast, SWJs provide more uniform control and superior flow control effectiveness and efficiency.

封闭水道中的圆筒形尾流及其通过扫掠射流的主动控制
利用粒子图像测速仪和压力测量法,对流经密闭圆筒的尾流动力学及其由位于前方停滞点的扫掠射流(SWJs)和稳定射流(SJs)进行的主动控制进行了实验研究。实验的雷诺数(Re,基于入流速度和气缸直径)范围为 10,000 到 45,000,阻塞比(\(\beta\))为\(1/2\)、\(1/3\)、\(1/4\)和\(1/5\)。当前结果与现有自然流动力学文献的综合比较填补了知识空白,并揭示了束缚会逐渐降低时间平均压力系数(C_{text\{p}}),增加阻力系数(C_{text\{D}})和斯特劳哈尔数(St)。随着 \(\beta\) 的增加,尾流与侧壁剪切层之间的相互作用逐渐增强。SWJs和SJs都有效地抑制了唤醒波动,流场的统计特征和适当的正交分解分析表明两种方法的流动控制机制是一致的。然而,SJ 在前向流场中引入了外部波动和不平衡力,导致尾流不对称。相比之下,SWJ 的控制更均匀,流动控制效果和效率更高。
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来源期刊
Experiments in Fluids
Experiments in Fluids 工程技术-工程:机械
CiteScore
5.10
自引率
12.50%
发文量
157
审稿时长
3.8 months
期刊介绍: Experiments in Fluids examines the advancement, extension, and improvement of new techniques of flow measurement. The journal also publishes contributions that employ existing experimental techniques to gain an understanding of the underlying flow physics in the areas of turbulence, aerodynamics, hydrodynamics, convective heat transfer, combustion, turbomachinery, multi-phase flows, and chemical, biological and geological flows. In addition, readers will find papers that report on investigations combining experimental and analytical/numerical approaches.
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