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首页> 外文期刊>Journal of atmospheric and oceanic technology >Wind Tunnel Measurements of the Response of Hot-Wire Liquid Water Content Instruments to Large Droplets
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Wind Tunnel Measurements of the Response of Hot-Wire Liquid Water Content Instruments to Large Droplets

机译：热线液体含水量仪器对大液滴的响应的风洞测量

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Wet wind tunnel tests were performed on more than 23 cloud liquid water content (LWC) probes and drop spectrometers at the NASA Icing Research Tunnel, with a main objective to characterize their response to large-droplet conditions. As a part of this study, the LWC and median volume diameter (MVD) reference values of the tunnel were examined, and accuracies were estimated and reported herein. Alternative MVDs were calculated from measurements conducted during the study. MVD accuracy was particularly difficult to estimate due to the lack of accepted standards, and MVD estimates were quite sensitive to the complement of instruments used to generate composite droplet spectra. Four hot-wire LWC probes were tested to characterize the LWC response as a function of cloud MVD. A response reduction was observed with increasing MVD for all three probes with cylindrical hot wires, most significant for the probe with the smallest wire diameter. The response of the Nevzorov total water content (TWC) probe, with its relatively large-diameter conical hot wire, did not roll off appreciably within the range of MVDs tested, although significantly larger inertial collision efficiency corrections were predicted for smaller droplets. The results corroborate previous studies that suggest re-entrainment of collected water likely creates a rolloff of the response of small-diameter cylindrical hot-wire probes, but also suggest that the aerodynamic design of the Nevzorov TWC probe inhibits re-entrainment by trapping droplets that enter its sample volume.
机译：在NASA结冰研究隧道上对23种以上的云状液态水含量（LWC）探针和液滴光谱仪进行了湿风洞测试，其主要目的是表征其对大液滴条件的响应。作为这项研究的一部分，检查了隧道的LWC和中位体积直径（MVD）参考值，并在此估算和报告了准确性。根据研究过程中的测量结果计算出替代的MVD。由于缺乏公认的标准，MVD准确性特别难以估计，并且MVD估计值对用于生成复合液滴光谱的仪器的补充非常敏感。测试了四个热线LWC探针，以将LWC响应表征为云MVD的函数。对于带有圆柱形热线的所有三个探头，随着MVD的增加，观察到响应降低，对于线径最小的探头，响应最明显。内夫佐洛夫总水含量（TWC）探头及其相对较大直径的圆锥形热线的响应在测试的MVD范围内没有明显下降，尽管预计较小液滴的惯性碰撞效率校正会更大。结果证实了先前的研究，即重新夹带收集的水可能会使小直径圆柱形热线探针的响应下降，但也表明Nevzorov TWC探针的空气动力学设计通过捕获液滴来抑制重新夹带。输入其样品量。

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