This study aims at addressing a problem on icing detection for Unmanned Aerial Vehicle (UAV for short) because traditional icing detection methods are costly and bulky. Toward this end, a pitot-based icing detection method is proposed, and the effect of different types of icing blocking on pressure is firstly reported. An icing detection system based on the pitot tube is designed and fabricated. Icing wind tunnel results indicate that if the pitot tube is blocked by glaze ice, then the total pressure of the pitot tube decreases gradually and remains unchanged and less than static pressure. However, if the pitot tube is blocked by rime ice, then the total pressure drops to the same level as the static pressure. If the pitot tube is blocked by non-ice organic materials, then the total pressure suddenly drops to the same level as the static pressure and remains unchanged. Furthermore, if the pitot tube contacts the water droplets but does not freeze, the total pressure output value fluctuates slightly. The effect of icing on pressure is caused by differences in ice microstructure, temperature, and flow velocity. At the same time, the proposed method offers a facile and low-cost approach for UAV icing detection.

中文翻译：

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基于皮托管的结冰检测：结冰对压力的影响

这项研究旨在解决无人飞行器（简称UAV）的结冰检测问题，因为传统的结冰检测方法既昂贵又笨重。为此，提出了一种基于皮托管的结冰检测方法，并首次报道了不同类型的结冰阻塞对压力的影响。设计并制造了一种基于皮托管的结冰检测系统。结冰的风洞结果表明，如果皮托管被釉冰阻塞，那么皮托管的总压力会逐渐降低，并保持不变，并且小于静态压力。但是，如果皮托管被霜冰堵住，则总压力会下降到与静压力相同的水平。如果皮托管被非冰有机材料阻塞，然后总压力突然下降到与静压力相同的水平并保持不变。此外，如果皮托管接触水滴但不冻结，则总压力输出值会略有波动。结冰对压力的影响是由冰的微观结构，温度和流速的差异引起的。同时，该方法为无人机结冰提供了一种简便，低成本的方法。