Mixed ice accretion on aircraft wings
Mixed ice accretion on aircraft wings
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DOI：
10.1063/1.5007301
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发表时间：
2018-02
影响因子：
4.6
通讯作者：
Zaid A. Janjua;B. Turnbull;S. Hibberd;K. Choi
中科院分区：
文献类型：
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作者：
Zaid A. Janjua;B. Turnbull;S. Hibberd;K. Choi
积冰是一种有问题的自然现象，其影响广泛的工程应用，包括电力电缆、无线电桅杆和风力涡轮机。当过冷水滴在撞击时瞬间冻结形成雾凇冰或作为水沿机翼沿着回流形成雨凇冰时，就会在飞机机翼上发生积冰。迄今为止，大多数模型都忽略了混合冰的堆积，这是雾凇和釉的组合。为了探讨混合积冰的概念，我们定义了一个参数“冻结分数”，即过冷液滴与积冰顶面碰撞时冻结的分数。此外，我们认为不同的“包装密度”的雾凇冰，模仿不同的散装雾凇密度在自然界中观察到的。冰的生长被认为是四个阶段：雾凇，初级混合，二次混合，和釉冰。预测与现有的模型和实验数据相匹配的限制雾凇和釉的情况下。然而，混合冰配方提供了额外的…
Ice accretion is a problematic natural phenomenon that affects a wide range of engineering applications including power cables, radio masts, and wind turbines. Accretion on aircraft wings occurs when supercooled water droplets freeze instantaneously on impact to form rime ice or runback as water along the wing to form glaze ice. Most models to date have ignored the accretion of mixed ice, which is a combination of rime and glaze. A parameter we term the “freezing fraction” is defined as the fraction of a supercooled droplet that freezes on impact with the top surface of the accretion ice to explore the concept of mixed ice accretion. Additionally we consider different “packing densities” of rime ice, mimicking the different bulk rime densities observed in nature. Ice accretion is considered in four stages: rime, primary mixed, secondary mixed, and glaze ice. Predictions match with existing models and experimental data in the limiting rime and glaze cases. The mixed ice formulation however provides additio...