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Aerothermal-Structural Analysis of a Rocket-Launched Mach 8 Scramjet Experiment: Ascent

机译：火箭发射的Mach 8超燃冲压发动机实验的气热结构分析：上升

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摘要

This paper reports on the methodology and results of a weak-coupled aerothermal-structural analysis on the ascent phase of the SCRAMSPACE Mach 8 scramjet flight experiment. This vehicle was essentially unshrouded during the flight trajectory, relying on the thin, 5mm thick aluminum external shell of the payload to maintain structural integrity and protect the flight experiment. As such, understanding the thermal-structural response of the vehicle was imperative to mission success. Using two- and three-dimensional models, an iterative procedure was employed to compute the flowfield, convective heating, wall temperatures and structural coupling at flight times covering both peak heating and peak surface temperature. Accounting for such coupling resulted in a 150K reduction in wall temperature compared to the more conservative cold wall assumption. Despite this, peak temperatures remained of the order of 550K. Further, thermally induced stresses within these regions were in excess of four times the material failure limits. Irreversible material failure during ascent was therefore concluded likely to occur on the external shell. Two alternate materials, steel 1006 and copper, were therefore assessed with the results indicating that steel sections on the external shell resulted in the best thermal-structural response of the payload.
机译：本文报告了SCRAMSPACE Mach 8超燃冲压发动机飞行试验上升阶段的弱耦合空气热结构分析的方法和结果。该飞行器在飞行过程中基本上没有遮挡，依靠有效载荷的5mm薄铝外壳来保持结构完整性并保护飞行实验。因此，了解车辆的热结构响应对任务的成功至关重要。使用二维和三维模型，采用迭代过程来计算流场，对流加热，壁温以及飞行时间（包括峰值加热和峰值表面温度）的结构耦合。与更保守的冷壁假设相比，考虑到这种耦合，壁温降低了150K。尽管如此，峰值温度仍保持在550K左右。此外，这些区域内的热应力超过材料破坏极限的四倍。因此推断出上升过程中不可逆的材料故障很可能发生在外壳上。因此，对两种替代材料钢1006和铜进行了评估，结果表明，外壳上的钢截面导致有效载荷的最佳热结构响应。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2015年第3期|684-696|共13页
  • 作者

    Capra Bianca R.; Brown L. M.; Boyce R. R.; Tirtey S. C.;

  • 作者单位

    Queensland Univ Technol, Sch Chem Phys & Mech Engn, Brisbane, Qld 4001, Australia;

    Univ New S Wales, Canberra, ACT 2600, Australia;

    Univ New S Wales, Dept Space Engn, Canberra, ACT 2600, Australia;

    Univ Queensland, Sch Mech & Min Engn, St Lucia, Qld 4067, Australia;

  • 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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