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Acoustic Characterization of Jet Interaction with Launch Structures During Lift-Off

机译：升空过程中射流与发射结构相互作用的声学特性

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摘要

The structures that constitute the environment surrounding the launch vehicle affect the noise levels experienced by it during liftoff. Earlier studies modeled the launch scenario by incorporating a jet impinging on plate geometries, either flat or curved, ignoring contributions from the components of the launch structures such as the launch platform. Very little is known about the effect of the structures on the propagation of noise from the jet exhaust toward the vehicle. This renders any effort to modify them for noise reduction quite challenging. The present study attempts to address this concern by investigating the contribution of a principal launch structure component, namely, the launch platform, toward the acoustic and flowfield around a generic launch vehicle exhausting on a generic jet blast deflector. The measurements include flowfield visualizations and aeroacoustic measurements using microphones in the near and far field. The results indicate that the presence of the launch platform increased the noise levels experienced by the vehicle beyond certain L/De. It is also observed that replacing the solid launch platform with a perforated one leads to lower levels of noise compared to the solid one but still higher than the case where launch platform is absent.
机译：构成运载火箭周围环境的结构会影响运载火箭在升空期间所经历的噪声水平。较早的研究通过合并射流撞击平板几何形状（平坦或弯曲）的射流场景来建模，而忽略了诸如发射平台之类的发射结构部件的贡献。关于结构对噪声从喷气机废气向车辆传播的影响知之甚少。这使得修改它们以减少噪声的任何努力都具有挑战性。本研究试图通过研究主要的发射结构部件，即发射平台，对在普通喷射爆炸偏转器上排气的普通运载火箭周围的声场和流场的贡献，来解决这一问题。测量包括使用近场和远场麦克风的流场可视化和空气声学测量。结果表明，发射平台的存在使车辆所经历的噪音水平超过了某些L / De。还观察到，与实心发射平台相比，用穿孔的实心发射平台代替实心发射平台导致较低的噪声水平，但仍比没有发射平台的情况更高。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2017年第2期|356-367|共12页
  • 作者

    Karthikeyan N.; Venkatakrishnan L.;

  • 作者单位

    Natl Aerosp Labs, Expt Aerodynam Div, Bangalore 560037, Karnataka, India;

    Natl Aerosp Labs, Expt Aerodynam Div, Bangalore 560037, Karnataka, 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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