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Annular Impinging Jet Controlled by Radial Synthetic Jets

机译：径向合成射流控制的环形撞击射流

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摘要

This experimental study focuses on generation and control of annular impinging jets. The annular nozzle used in the investigations was designed with an active flow control system using 12 synthetic jets issuing radially from the central nozzle body. Measurements of the control effects were made on the impingement wall. The data acquisition involved wall pressure and wall mass transfer (by the naphthalene sublimation technique) using air as the working fluid. Also measured was time-meanflow velocity (by a Pitot probe) in the jet flow field. Moreover, flow visualization was carried out. Two main flow-field patterns (A and B) were identified. The patterns differ in the size of the separated-flow recirculation regions that develop attached to the nozzle central body: While pattern A is characterized by a quite small recirculation region (bubble) extending not far from the nozzle exit, pattern B exhibits a large recirculation region, reaching up to the impingement wall, on which it forms a stagnation circle. The control action modifies the flow field, resulting in changes of the corresponding heat/mass transfer distributions. The convective transfer rate on the stagnation circle can be demonstrably enhanced by 20% at a moderate nozzle-to-wall distance, equal to 0.6 of the nozzle outer diameter.
机译：这项实验研究的重点是环形撞击射流的产生和控制。研究中使用的环形喷嘴设计有主动流量控制系统，该系统使用了从中央喷嘴主体沿径向发出的12条合成射流。在冲击壁上进行了控制效果的测量。数据采集​​涉及使用空气作为工作流体的壁压力和壁质量传递（通过萘升华技术）。还测量了射流场中的时均流速（通过皮托管）。此外，进行了流动可视化。确定了两个主要的流场模式（A和B）。图案的不同之处在于附着在喷嘴中心体上的分流再循环区域的大小：图案A的特征是非常小的再循环区域（气泡）延伸到喷嘴出口附近，而图案B表现出较大的再循环到达撞击壁的区域，在其上形成停滞圈。控制动作会改变流场，从而导致相应的热量/质量传递分布发生变化。在适中的喷嘴到壁的距离（等于喷嘴外径的0.6）下，停滞圆上的对流传递速率可以提高20％。

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  • 来源
    《Heat Transfer Engineering》 |2014年第18期|1450-1461|共12页
  • 作者

    ZDENEK TRAVNICEK; VACLAV TESAR; ZUZANA BROUCKOVA; KAZIMIERZ PESZYNSKI;

  • 作者单位

    Institute of Thermomechanics AS CR, v.v.i., Dolejskova 5, Prague, Czech Republic;

    Institute of Thermomechanics AS CR, v.v.i., Prague, Czech Republic;

    Institute of Thermomechanics AS CR, v.v.i., Prague, Czech Republic;

    University of Technology and Life Sciences, Bydgoszcz, Poland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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