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Base Pressure Fluctuations on Typical Missile Configuration in Presence of Base Cavity

机译：具有基础腔的情况下典型导弹构型的基础压力波动

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摘要

Pressure fluctuations in the base region of a typical missile configuration at a freestream Mach number of 0.7 are examined experimentally in the presence and absence of a base cavity. The objective was to characterize the pressure fluctuations and explain the influence of base cavities on their behavior. Experiments include unsteady pressure measurements at six azimuthal locations. Substantial variation in the characteristics of pressure fluctuations is noticed along the azimuthal direction due to the asymmetry of the model. The base cavities are seen to enhance the base pressure and reduce the root mean square of the pressure fluctuations. Higher-order moments show diminishing trend as the length of the base cavity is increased. Spectra in the absence of cavity exhibit three types of narrow-band tones based on the Strouhal number. Type I tones disapper from the spectra for small-length cavities, whereas type II tones get suppressed. On the other hand, for the large-length cavities, type I tones get enhanced, whereas type II tones disappear. Autocorrelation and cross-correlation plots exhibit a large-amplitude, low-frequency oscillation that exists even after large separation times for the larger-length cavities, and virtually no such oscillations are visible for the small-length-cavity models.
机译：在存在和不存在基础腔的情况下，通过实验检查了自由流马赫数为0.7时典型导弹构型的基础区域中的压力波动。目的是表征压力波动并解释基腔对其行为的影响。实验包括在六个方位角位置的非稳态压力测量。由于模型的不对称性，沿方位角方向观察到了压力波动特性的显着变化。可以看到基本腔体可以提高基本压力，并减小压力波动的均方根。随着基腔长度的增加，高阶矩显示出减小的趋势。在没有腔的情况下，光谱会根据斯特劳哈尔数显示出三种类型的窄带音调。 I型音调从短腔的光谱中消失，而II型音调被抑制。另一方面，对于大长度的空腔，I型音调得到增强，而II型音调消失。自相关图和互相关图显示出大幅度的低频振荡，即使对于较大长度的腔体，在较长的分离时间后仍存在，而对于较小长度的腔体模型，实际上没有这种振荡可见。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2018年第2期|335-345|共11页
  • 作者

    Vikramaditya N. S.; Viji M.; Verma S. B.; Ali Naveed; Thakur D. N.;

  • 作者单位

    Natl Aerosp Labs, Expt Aerodynam Div, CSIR, Bangalore 560017, Karnataka, India;

    Natl Aerosp Labs, Expt Aerodynam Div, CSIR, Bangalore 560017, Karnataka, India;

    Natl Aerosp Labs, Aerodynam Div, CSIR, Bangalore 560017, Karnataka, India;

    DRDL, Aerodynam Design Div, Hyderabad 500058, Andhra Pradesh, India;

    DRDL, Aerodynam Design Div, Hyderabad 500058, Andhra 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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