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Modeling of Stardust Entry at High Altitude, Part 1: Flowfield Analysis

机译：高空星尘进入的建模，第1部分：流场分析

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摘要

The Stardust sample return capsule entered the Earth’s atmosphere at a very energetic velocity of 12:6 km=s.Innthe present study, both continuum (computational fluid dynamics) and particle (direct simulation Monte Carlo)nmethods are used to analyze the forebody flow of the Stardust sample return capsule at altitudes of 81 and 71 km,nwhere the flow is in the near-continuum regime. At the higher altitude, direct comparisons between baselinencomputational fluid dynamics and direct simulationMonteCarlomodels give enormous differences in basic flowfieldnproperties. To study the discrepancy between the solutions, a modified approach for determining the temperaturenused by computational fluid dynamics to control the dissociation and ionization reactions is investigated. Thenmodified computational fluid dynamics and direct simulation Monte Carlo results are in significantly betternagreement with each other, illustrating the strong sensitivity to chemistry modeling under these highly energeticnconditions. Significant differences persist in temperatures near the capsule surface and in surface heat flux.nEvaluation of local Knudsen numbers indicates that the flow experiences noncontinuumbehavior in the shock frontnand at the capsule surface that explains the smaller heat flux predicted by direct simulationMonteCarlo.At the lowernaltitude, the flowfield results become less sensitive to details of the chemistry modeling, although noncontinuumneffects are again predicted at the stagnation point.
机译：星尘样品返回舱以12：6 km = s的非常高的速度进入地球大气层。在本研究中，连续体（计算流体动力学）和粒子（直接模拟蒙特卡洛）方法均用于分析前体流。在81和71 km的高空，星尘样品返回舱，其流量处于近连续状态。在更高的海拔高度上，基线n计算流体动力学与直接模拟MonteCarlo模型之间的直接比较在基本场特性方面产生了巨大差异。为了研究解决方案之间的差异，研究了一种通过计算流体动力学控制解离和电离反应的温度确定方法。简化的计算流体动力学和直接模拟的蒙特卡洛结果彼此之间有着明显更好的一致性，说明了在这些高能条件下对化学建模的强烈敏感性。在胶囊表面附近的温度和表面热通量上仍然存在显着差异。n局部Knudsen数的评估表明，冲击波前沿和胶囊表面的通量表现出非连续性，这解释了直接模拟蒙特卡洛所预测的较小热通量。尽管对非连续性的影响再次在停滞点进行了预测，但场结果对化学模型的细节变得不太敏感。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2010年第5期|p.708-717|共10页
  • 作者

    Iain D. Boyd; Kerry A. Trumble; Michael J. Wright;

  • 作者单位

    Iain D. Boyd∗University of Michigan, Ann Arbor, Michigan 48109-2140andKerry A. Trumble†and Michael J. Wright‡NASA Ames Research Center, Moffett Field, California 94035-1000;

  • 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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