Complex-Trajectory Aerodynamics Data for Code Validation from a New Free-Flight Facility
Complex-Trajectory Aerodynamics Data for Code Validation from a New Free-Flight Facility
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DOI：
10.2514/6.2006-662
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
Jeffrey D. Brown;D. Bogdanoff;L. Yates;M. Wilder;S. Murman
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文献类型：
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作者：
Jeffrey D. Brown;D. Bogdanoff;L. Yates;M. Wilder;S. Murman
提出了一种独特的新功能，可以获取飞行复杂轨迹的配置的非定常空气动力学数据。圆锥台形射弹的超音速自由飞行空气动力学数据是在美国宇航局艾姆斯研究中心的一个新的空气弹道设施中获得的。这些射弹模拟了从航天飞机外部燃料箱中脱落的绝缘泡沫碎片。航天飞机计划需要这些数据，以便在哥伦比亚号返回飞行之前验证用于表征航天飞机上升碎片空气动力学和风险的 6-DOF/CFD 代码。聚乙烯平截头体——标称直径为 3.56 厘米，长 0.71 厘米，质量为 4 克——被发射到大约 M=2.8 的 1 个大气压的空气中。它们快速减速、通常高度提升、有时翻滚的 6 自由度轨迹由顶视和侧视 ICCD 相机阵列记录。本文提供了数据样本、重大挑战的详细信息以及与获取这些挑战相关的创造性解决方案。
A unique new capability to obtain unsteady aerodynamics data for configurations flying complex trajectories is presented. Supersonic free-flight aerodynamics data for conical frustum-shaped projectiles were obtained in a new aero-ballistic facility at NASA Ames Research Center. The projectiles simulated insulating-foam debris shed from the Space Shuttle's external fuel tank. The data were required by the Space Shuttle Program to validate, prior to the post-Columbia return-to-flight, the 6-DOF/CFD code used to characterize Shuttle ascent-debris aerodynamics and risks. Polyethylene frustums— nominally 3.56 cm in diameter, 0.71 cm long, and 4 grams in mass—were launched into 1- atm air at approximately M=2.8. Their rapidly-decelerating, often highly-lifting, and sometimes tumbling 6-DOF trajectories were recorded by arrays of top- and side-view ICCD cameras. The paper gives samples of the data and details of the substantial challenges and creative solutions associated with obtaining them.