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Configurations of lobed nozzles for high mixing effectiveness

机译：叶片喷嘴的配置可实现高混合效率

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摘要

The circular lobed nozzle used in the infrared suppressors of helicopters and warships has a configuration that facilitates highly effective mixing of the jet. A sword alternating-lobe nozzle and two types of spoilers (installed at the lobe peaks to improve the mixing) were introduced. In this study, numerical investigations of the jet mixings of different nozzle configurations were conducted. The nozzles considered were a baseline lobed nozzle, a baseline lobed nozzle with a central plug, a coplanar alternating-lobe nozzle, a sword alternating-lobe nozzle, and a sword alternating-lobe nozzle with lobe-peak spoilers. The dominant factors that affect the pumping performance, mixing effectiveness, and pressure loss were also analysed. It was found that, in addition to the intensity of the streamwise vortices and the distribution of the primary stream, the distribution of the streamwise vortices is also strongly related to the mixing effectiveness and determined the formation of new and plumper streamwise vortices, which improved the mixing effectiveness. The division into three segments of the side of the streamwise vortices on which the primary and secondary streams contact each other is propounded. The three segments are the windward, sideward, and leeward segments. The windward segment has the fastest mixing, followed by the sideward segment, while the leeward segment has the slowest mixing. The plumper streamwise vortices enhance mixing because their windward segment is longer.
机译：直升机和军舰的红外线抑制器中使用的圆瓣喷嘴的构造有助于高效地混合射流。介绍了剑状交替瓣喷嘴和两种扰流板（安装在瓣尖处以改善混合效果）。在这项研究中，对不同喷嘴配置的射流混合进行了数值研究。所考虑的喷嘴是基线凸角喷嘴，带有中央塞子的基线凸角喷嘴，共面交替凸角喷嘴，剑交替凸角喷嘴和带有凸峰扰流板的剑交替凸角喷嘴。还分析了影响泵送性能，混合效果和压力损失的主要因素。已经发现，除了沿流涡流的强度和一次流的分布外，沿流涡流的分布还与混合效率密切相关，并确定了新的和较饱满的沿流涡流的形成，从而改善了流向的涡流。混合效果。提出了将主流和次级流彼此接触的流向涡流侧面分成三个部分的建议。这三个部分是上风，侧风和下风。上风段混合最快，其次是侧风段，而下风段混合最慢。丰满的涡流增强了混合效果，因为它们的迎风段更长。

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  • 来源
    《International Journal of Heat and Mass Transfer》 |2015年第12期|671-683|共13页
  • 作者

    Zhi-qiang Sheng; Pei-lin Huang; Tong Zhao; Jin-zu Ji;

  • 作者单位

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

    School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, 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
  • 中图分类
  • 关键词

    Jet mixing; Lobed nozzle; Mixing effectiveness; Streamwise vortices; Numerical simulation;

    机译：喷射混合;喷嘴裂混合效果;顺流涡流;数值模拟;

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