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Numerical analysis of transonic buffet flow around a hammerhead payload fairing

机译：锤头载荷整流罩周围跨音速自助流的数值分析

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摘要

During ascent of launcher, the unsteady aerodynamic loads associated with transonic buffet flow have become of considerable concern. To study the unsteady dynamics of buffet flow, delayed detached-eddy simulations of a hammerhead configuration have been conducted at transonic Mach numbers. The results, including mean Cp, Cp-rms, PSD and Schlieren visualizations, were validated by the measurements obtained from the wind-tunnel experiments. Nevertheless, to perform a good validation for unsteady loads, the numerical data needed to be filtered according to the data acquisition used in the experiments. The studies were performed by means of instantaneous, statistical, spectral and cross-spectral analysis of the numerical data, which identify the fluid dynamic mechanism that produces a relatively strong buffet environment. The mechanism involves a sequence of vortex, which is shed downstream, merges together, and ultimately impinges on the wall leading to large fluctuations. Besides, the cross-spectral analysis also revealed that the subsequent large scale and low frequency vortex shedding of the developed shear layer provides a strong influence on the flows around cone-cylinder conjunction. The fluctuations in this area are highly sensitive to Mach numbers, and the peak of Cp-rms, appears at Ma approximate to 0.81. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：在发射器上升期间，与跨音速自助流量相关的不稳定空气动力学负载已成为相当令人关注的问题。为了研究自助餐流动的非稳态动力学，已经在跨音速马赫数下进行了锤头结构的延迟分离涡模拟。通过风洞实验获得的测量结果验证了结果，包括平均Cp，Cp-rms，PSD和Schlieren可视化效果。然而，为了对不稳定载荷进行良好的验证，需要根据实验中使用的数据采集来过滤数值数据。这些研究是通过对数值数据进行瞬时，统计，光谱和互谱分析来进行的，这些分析确定了产生相对较强的自助餐环境的流体动力学机制。该机制涉及一系列涡流，这些涡流向下游散发，融合在一起，并最终撞击在壁上，从而导致较大的波动。此外，跨光谱分析还表明，随后形成的剪切层的大规模和低频涡旋脱落对锥-圆柱结合附近的流动提供了强大的影响。该区域的涨落对马赫数高度敏感，Cp-rms的峰值出现在Ma处，约为0.81。 （C）2018 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2019年第1期|604-619|共16页
  • 作者

    Liu Yi; Wang Gang; Zhu Hongyu; Ye Zhengyin;

  • 作者单位

    Northwestern Polytech Univ, Sch Aeronaut, Dept Fluid Dynam, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sch Aeronaut, Dept Fluid Dynam, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sch Aeronaut, Dept Fluid Dynam, Xian 710072, Shaanxi, Peoples R China;

    Northwestern Polytech Univ, Sch Aeronaut, Dept Fluid Dynam, Xian 710072, Shaanxi, Peoples R 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
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