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Experimental and Numerical Analysis on the Internal Flow of Supersonic Ejector Under Different Working Modes

机译：不同工作模式下超音速喷射器内部流动的实验与数值分析

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摘要

Supersonic ejectors involve very complex phenomena such as interaction between supersonic and subsonic flows, shock trains, instabilities, which strongly influences the performance of supersonic ejector. In this study, the static pressure distribution along the ejector wall and Mach number distribution along the axis are used to investigate the internal flow field of supersonic ejector. Results indicate that when the back pressure is much less than the critical back pressure, there are two series of shock trains, and the change of the back pressure will not affect the flow field before the effective area section, so the entrainment ratio would remain constant. The second shock train moves further upstream and is combined with the first shock train to form a single shock train as the back pressure rises. When the back pressure is greater than the critical back pressure, the position of the shock train, the static pressure at its upstream and the entrainment ratio, will be affected. The "effective area section" in the mixing tube is obtained. The effective area section position moves downstream with the increase of the primary flow pressure, while it moves upstream with the increase of the secondary flow pressure. The entrainment ratio shows inversely proportional relationship with the effective section position. Besides, the first shock train length increases with the increase of primary flow pressure or secondary flow pressure. The critical back pressure represents direct proportional relationship to the first shock train length.
机译：超音速喷射器涉及非常复杂的现象，例如超音速和亚音速流之间的相互作用，冲击波，不稳定性，这会严重影响超音速喷射器的性能。在这项研究中，沿喷射器壁的静压力分布和沿轴的马赫数分布用于研究超音速喷射器的内部流场。结果表明，当背压远小于临界背压时，会产生两个系列的冲击波，并且背压的变化不会影响有效面积截面之前的流场，因此夹带率将保持恒定。 。第二个冲击波进一步向上游移动，并随着背压的上升而与第一个冲击波结合形成一个单独的冲击波。当背压大于临界背压时，冲击波列的位置，上游的静压和夹带率都会受到影响。获得混合管中的“有效面积部分”。有效区域截面位置随着一次流量压力的增加而向下游移动，而随着二次流量压力的增加而向上游移动。夹带率与有效截面位置成反比关系。此外，随着主流动压力或副流动压力的增加，第一冲击波列的长度增加。临界背压代表与第一冲击波长度的直接比例关系。

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  • 来源
    《Heat Transfer Engineering》 |2018年第8期|700-710|共11页
  • 作者

    Weixiong Chen; Kangkang Xue; Huiqiang Chen; Daotong Chong; Junjie Yan;

  • 作者单位

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

    State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, China;

  • 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);
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