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Characteristics of base pressure fluctuations of a typical missile configuration with a propulsive jet

机译：带有推进射流的典型导弹构型的基本压力波动特征

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摘要

Experiments were carried out to investigate the pressure fluctuations in the base region of a typical missile configuration at a freestream Mach number of 0.7 in the presence and absence of a propulsive jet. The objective was to characterize these pressure fluctuations and identify the underlying mechanisms responsible for their origin. Experiments included unsteady pressure measurements at six azimuthal locations and schlieren visualization. Substantial variation in the characteristics of pressure fluctuations is noticed along the azimuthal direction due to the asymmetry of the model. The probability density function (PDF) of pressure fluctuations indicates a significant drop in the peak PDF value and a substantial broadening at the highest nozzle pressure ratio (NPR). With an increase in NPR, the skewness decreases and approaches a Gaussian value while the kurtosis decreases and is seen to go below that of a Gaussian. Spectra of the pressure fluctuations indicate that the narrowband tones can be classified into three types based on the Strouhal number. Two types of tones among the three aforementioned are seen to be suppressed in the presence of the jet. Cross-correlation plots in the absence of the jet exhibit a large amplitude, low frequency oscillation which exists even after large separation times. On the other hand, in the presence of the jet, the oscillations dampen rapidly and vanish as the separation time increases. Finally, an attempt has been made to identify the possible primary mechanisms that are driving the base pressure fluctuations based on the observed characteristics of the acquired unsteady pressure signal. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：进行实验以研究存在和不存在推进射流的情况下，在自由流马赫数为0.7的情况下，典型导弹构型的基础区域中的压力波动。目的是表征这些压力波动并确定造成其波动的潜在机制。实验包括在六个方位角位置的非稳态压力测量和schlieren可视化。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。压力波动的概率密度函数（PDF）表示PDF峰值显着下降，并且在最高喷嘴压力比（NPR）处明显变宽。随着NPR的增加，偏度减小并接近高斯值，而峰度减小并被认为低于高斯值。压力波动的频谱表明，根据斯特劳哈尔数，窄带音调可以分为三种类型。在喷射流的存在下，上述三种声音中的两种音调被抑制。在不存在射流的情况下，互相关图显示出大幅度的低频振荡，即使经过大的分离时间也存在。另一方面，在存在射流的情况下，随着分离时间的增加，振荡会迅速衰减并消失。最终，已经尝试基于所获取的非稳态压力信号的观测特征来识别驱动基本压力波动的可能主要机制。 （C）2017 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2017年第12期|695-705|共11页
  • 作者

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

  • 作者单位

    Natl Aerosp Labs, Bangalore 560017, Karnataka, India;

    Natl Aerosp Labs, Bangalore 560017, Karnataka, India;

    Natl Aerosp Labs, Bangalore 560017, Karnataka, India;

    Def Res & Dev Lab, Hyderabad 500058, Andhra Pradesh, India;

    Def Res & Dev Lab, 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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