Application of STARFLEET Velocimetry in the NASA Langley 0.3-meter Transonic Cryogenic Tunnel

2018 Aerodynamic Measurement Technology and Ground Testing Conference Pub Date : 2018-06-24 DOI:10.2514/6.2018-2989

Daniel T. Reese, P. Danehy, N. Jiang, J. Felver, Daniel R. Richardson, J. Gord

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引用次数: 22

Abstract

Selective two-photon absorptive resonance femtosecond laser electronic excitation tagging (STARFLEET) velocimetry is demonstrated for the first time in a NASA Langley wind tunnel with high repetition-rate and single-shot imaging. Experiments performed in the 0.3-meter Transonic Cryogenic Tunnel (TCT) allowed for testing at 300 K over a range of pressures (124 to 517 kPa) and Mach numbers (0.2-0.8) for freestream conditions and flow behind a cylindrical model. Measurement precision and accuracy are determined for the current set of experiments, as are signal intensity and lifetime. Precisions of 3-5 m/s (based on one standard deviation) were typical in the experiment; precisions better than 2% of the mean velocity were obtained for some of the highest velocity conditions. Agreement within a mean error of 3 m/s between STARFLEET freestream velocity measurements and facility DAS readings is demonstrated. STARFLEET is also shown to return spatially-resolved velocity profiles, though some binning of the signal is required

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星际舰队测速技术在NASA兰利0.3米跨音速低温隧道中的应用

选择性双光子吸收共振飞秒激光电子激励标记(STARFLEET)测速首次在美国宇航局兰利风洞中进行了高重复率和单次成像的验证。在0.3米的跨音速低温隧道(TCT)中进行的实验允许在300 K的压力范围(124至517 kPa)和马赫数(0.2-0.8)下进行自由流条件和圆柱形模型后流动的测试。测量精度和准确度取决于当前的一组实验，信号强度和寿命也是如此。在实验中，典型的精度为3-5 m/s(基于一个标准差);在一些最高速度条件下，精度优于平均速度的2%。证明了STARFLEET自由流速度测量值与设施DAS读数之间的平均误差在3米/秒内的一致性。星际舰队也显示返回空间分辨的速度剖面，尽管需要一些信号的分割

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2018 Aerodynamic Measurement Technology and Ground Testing Conference

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