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首页> 外文期刊>Applied Acoustics >Turbulent jet interaction with a long rise-time pressure signature
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Turbulent jet interaction with a long rise-time pressure signature

机译：湍流射流相互作用，具有较长的上升时间压力特征

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摘要

A sonic boom signature with a long rise time has the ability to reduce the sonic boom, but it does not necessarily minimize the sonic boom at the ground level because of the real atmospheric turbulence. In this study, an effect of the turbulence on a long rise-time pressure signature was experimentally investigated in a ballistic range facility. To compare the effects of the turbulence on the long and short rise-time pressure signatures, a cone-cylinder projectile that simultaneously produces these pressure signatures was designed. The pressure waves interacted with a turbulent field generated by a circular nozzle. The turbulence effects were evaluated using flow diagnostic techniques: high-speed schlieren photography, a point-diffraction interferometer, and a pressure measurement. In spite of the fact that the long and short rise-time pressure signatures simultaneously travel through the turbulent field, the turbulence effects do not give the same contribution to these overpressures. Regarding the long rise-time pressure signature, the overpressure fluctuation due to the turbulence interaction is almost uniform, and a standard deviation 1.5 times greater than that of the no-turbulence case is observed. By contrast, a short rise-time pressure signature which passed through the same turbulent field is strongly affected by the turbulence. A standard deviation increases by a factor of 14 because of the turbulence interaction. Additionally, there is a non-correlation between the overpressure fluctuations of the long and short rise-time pressure signatures. These results deduce that the length of the rise time is important to the turbulence effects such as the shock focusing/diffracting. (C) 2016 Elsevier Ltd. All rights reserved.
机译：具有较长上升时间的声波喷杆具有降低声波喷杆的能力，但由于实际的大气湍流，并不一定使地面的声波喷杆最小。在这项研究中，在弹道靶场实验中研究了湍流对长时间上升压力信号的影响。为了比较湍流对长期和短期上升时间压力信号的影响，设计了同时产生这些压力信号的圆锥圆柱弹。压力波与圆形喷嘴产生的湍流相互作用。使用流动诊断技术评估湍流效应：高速schlieren摄影，点衍射干涉仪和压力测量。尽管长时和短时上升压力信号同时在湍流场中传播，但湍流效应对这些超压的贡献不同。关于长的上升时间压力特征，由于湍流相互作用而引起的超压波动几乎是均匀的，并且观察到的标准偏差是无湍流情况下的标准偏差的1.5倍。相比之下，通过相同湍流场的短上升时间压力特征受到湍流的强烈影响。由于湍流相互作用，标准偏差增加了14倍。此外，长和短上升时间压力信号的过压波动之间不存在相关性。这些结果推断出上升时间的长度对于湍流效应（如冲击聚焦/衍射）很重要。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Applied Acoustics》 |2016年第12期|179-190|共12页
  • 作者

    Ukai Takahiro; Ohtani Kiyonobu; Obayashi Shigeru;

  • 作者单位

    Tohoku Univ, Inst Fluid Sci, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan|Univ Glasgow, Sch Engn, Glasgow G12 8QQ, Lanark, Scotland;

    Tohoku Univ, Inst Fluid Sci, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan;

    Tohoku Univ, Inst Fluid Sci, Aoba Ku, 2-1-1 Katahira, Sendai, Miyagi 9808577, Japan;

  • 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

    Shock-turbulence interaction; Low sonic boom signature; Ballistic range facility;

    机译：冲击-湍流相互作用;低声波动臂特征;弹道范围设施;

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