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Effect of drop size on the impact thermodynamics for supercooled large droplet in aircraft icing

机译：液滴大小对飞机结冰中过冷大液滴冲击热力学的影响

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摘要

Supercooled large droplet (SLD), which can cause abnormal icing, is a well-known issue in aerospace engineering. Although efforts have been exerted to understand large droplet impact dynamics and the supercooled feature in the film/substrate interface, respectively, the thermodynamic effect during the SLD impact process has not received sufficient attention. This work conducts experimental studies to determine the effects of drop size on the thermodynamics for supercooled large droplet impingement. Through phenomenological reproduction, the rapid-freezing characteristics are observed in diameters of 400, 800, and 1300 mu m. The experimental analysis provides information on the maximum spreading rate and the shrinkage rate of the drop, the supercooled diffusive rate, and the freezing time. A physical explanation of this unsteady heat transfer process is proposed theoretically, which indicates that the drop size is a critical factor influencing the supercooled heat exchange and effective heat transfer duration between the film/substrate interface. On the basis of the present experimental data and theoretical analysis, an impinging heating model is developed and applied to typical SLD cases. The model behaves as anticipated, which underlines the wide applicability to SLD icing problems in related fields. Published by AIP Publishing.
机译：可能导致异常结冰的过冷大液滴（SLD）是航空航天工程中的一个众所周知的问题。尽管已努力了解膜/基材界面中的大液滴冲击动力学和过冷特征，但SLD冲击过程中的热力学效应尚未引起足够的重视。这项工作进行了实验研究，以确定液滴大小对过冷大液滴撞击的热力学的影响。通过现象学再现，观察到直径为400、800和1300μm的快速冻结特性。实验分析提供了有关最大散布率和液滴的收缩率，过冷扩散率和凝固时间的信息。理论上提出了对该不稳定传热过程的物理解释，该物理解释表明，液滴尺寸是影响膜/基底界面之间的过冷热交换和有效传热持续时间的关键因素。根据目前的实验数据和理论分析，开发了一个撞击加热模型，并将其应用于典型的SLD案例。该模型的行为符合预期，这突显了其在相关领域对SLD结冰问题的广泛适用性。由AIP Publishing发布。

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