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Numerical investigation of characteristics of fluidic oscillator operating in quiescent air and a crossflow

机译：静态空气中运行的流体振荡器特性的数值研究及横流

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摘要

We present a detailed numerical study of characteristics of fluidic oscillator operating in originally quiescent air and in a crossflow. Our study is focused on the visualization of flow field evolution associated with fluidic oscillator in an attempt to shed some light into the elucidation of mechanism of jet oscillation and interaction of jet flow with crossflow and into the revelation of flow control mechanism of fluidic oscillator. Reynolds-averaged two-dimensional computation with elaborate Reynolds stress turbulence model allows us to reproduce the experimentally observed salient flow features like recirculation bubbles in actuator and oscillating jet. The excellent agreement between simulation and experiment in both qualitative flow structures and quantitative jet oscillation frequency gives credibility to a number of new observations made from simulation, which, however, are not apparent in experimental data. For example, it is found from our simulation that the scaling of a specific actuator does not significantly influence the characteristics of the scaled actuator and mechanism of associated flow oscillation. In addition, the interaction of oscillating jet with external crossflow leads to the generation of spanwise vortices, which, in the presence of flow separation, is believed to be able to entrain high momentum external flow towards body surface and play a dominant role in flow separation control. Moreover, when the intensity of crossflow increases, the frequency of jet oscillation decreases. Thus, our work presents an updated description of working principles and mechanisms of fluidic oscillator. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：我们在原来的静态空气，并在横流呈现流体振荡器操作的特性的详细数值研究。我们的研究集中于与流体振荡器以试图阐明一些成射流振荡和喷流的相互作用的机制与横流并进入的流体振荡器的流动控制机构的启示阐明相关联的流场演化的可视化。雷诺平均精心雷诺应力湍流模型的二维计算允许我们重现实验观察到的显着的流动特性的部件等的再循环在致动器和振荡喷射气泡。在定性流动结构和定量喷射振荡频率仿真和实验之间的良好的协议给信誉若干从模拟制成新的观察结果，其中，但是，不在实验数据清楚。例如，它是从我们的模拟发现，特定的致动器的缩放不会显著影响缩放致动器和相关联的流振荡机构的特性。此外，振荡与外部横流引线喷射到产生翼展涡流，其在流动分离的情况下，被认为是能够以夹带朝向身体表面高动量外部流和播放在流动分离主导作用的相互作用控制。此外，当横流的强度增加，射流振荡的频率减小。因此，我们的工作提出工作原理和流体振荡器机制的更新说明。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第6期|106731.1-106731.12|共12页
  • 作者

    Zheng J. G.; Xia L.; Hu J.; Mao Y. J.;

  • 作者单位

    Huazhong Univ Sci & Technol Sch Aerosp Engn Wuhan 430074 Hubei Peoples R China;

    Huazhong Univ Sci & Technol Sch Aerosp Engn Wuhan 430074 Hubei Peoples R China;

    Inst Appl Phys & Computat Math Beijing 100094 Peoples R China;

    Huazhong Univ Sci & Technol Sch Aerosp Engn Wuhan 430074 Hubei Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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