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Experimental investigation of the effect of extended cowl on the flow field of planar plug nozzles

机译：扩展罩对平面塞形喷嘴流场影响的实验研究

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摘要

Plug and ramp nozzles offer many advantages over the conventional converging-diverging counterpart and have received much attention in the recent decades. Variants of plug nozzles have been investigated for a wide range of operating conditions. The performance of these nozzles is dependent on the flow development on the plug or ramp surface, which in turn is greatly influenced by the cowl geometry. Experiments are conducted to study the planar plug nozzle flowfield for Mach 1.8 and 2.2 using half nozzle geometry. The work primarily focuses on the influence of the cowl length on the flow evolution on the plug surface at different nozzle pressure ratios (NPRs). The cowl of the outer nozzle is extended to 10, 30, 50 and 100% of the full plug length. This allows the supersonic flow to partially expand internally ahead of the throat section. Schlieren images are used to visualize the wave structure at different pressure ratios for different cowl lengths. For low NPRs, the nozzle with extended cowl behaves more like a conventional planar nozzle with strong shock waves. It is observed that the cowl length influences the pressure distribution on the plug surface only for low NPRs. The effect of side walls on the flow field of planar plug nozzles is also studied. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译：塞阀和斜管喷嘴比传统的会聚-扩口喷嘴具有许多优势，并且在最近几十年中受到了广泛的关注。已经针对各种操作条件研究了旋塞喷嘴的各种形式。这些喷嘴的性能取决于在塞子或斜坡表面上的流动发展，这又受到前围几何形状的很大影响。进行了实验，以使用半喷嘴几何形状研究1.8和2.2马赫的平面塞式喷嘴流场。这项工作主要集中在不同喷嘴压力比（NPRs）时，前围长度对旋塞表面流动演变的影响。外喷嘴的前围板延伸至整个塞子长度的10％，30％，50％和100％。这允许超音速流在喉部段之前在内部部分膨胀。 Schlieren图像用于可视化不同整流罩长度的不同压力比下的波浪结构。对于低NPR，带有扩展罩的喷嘴的性能更像具有强冲击波的常规平面喷嘴。可以看到，前围长度仅在低NPR时才影响塞子表面的压力分布。还研究了侧壁对平面塞式喷嘴流场的影响。 （C）2019 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第5期|208-221|共14页
  • 作者

    Khan Aqib; Panthi Rohit; Kumar Rakesh; Ibrahim S. Mohammed;

  • 作者单位

    Indian Inst Technol Kanpur, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

    Indian Inst Technol Kanpur, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

    Indian Inst Technol Kanpur, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

    Indian Inst Technol Kanpur, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

  • 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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