Quantification of Wind-Driven Surface Water Transport Process for Aircraft Icing Studies

提议的研究将详细探讨导致飞机机翼结冰的条件。飞机机翼周围的水、冰和空气的流动将通过一种实验技术来观察，该实验技术将作为本提案的一部分而开发。这个实验设施对于美国的学术机构来说是相当独特的。除了了解结冰过程的基本知识外，了解和预测这一过程可以使飞机更安全、更便宜地运行。还建议与当地科学和数学教师建立联系，并为K-12学校开展外展活动。项目建议开发一个新的飞机结冰和演示实验模块，用于外展活动，以吸引年轻学生学习工程和科学。该项目的目标是开发一种新的技术来量化由增冰翼型/机翼表面上的边界层气流驱动的非定常地表水输送过程，从而使飞机在结冰条件下更安全、更高效地运行。这项新的实验技术（数字图像投影传感，DIPS）是基于结构光三角测量的，它类似于提供3D图像的立体视觉技术，但它需要用数字投影仪替换一个用于立体成像的相机。如果成功，提出的DIPS技术将成为一种非侵入式技术，能够实现在增冰翼型/机翼表面上对表面水滴/溪流流动（即不稳定的表面水输送过程）的厚度分布的瞬时测量。这将为解决涉及多相流与凝固相互作用的具有挑战性的问题提供基础。详细研究飞机机翼的表面特性（如疏水性和导热性）对地表水输送和冰形成的影响。

PI: Hu, HuiProposal Number: 1435590The proposed research will explore in detail the conditions that lead to icing on aircraft wings. The flow of water, ice and air around the wings of an airplane will be observed with an experimental technique that will be developed as part of this proposal. The experimental facility is rather unique for a US academic institution. In addition to fundamental knowledge on the process of icing, understanding and predicting this process can lead to both safer and cheaper operation of aircrafts. Connections to local science and math teachers and outreach activities for K-12 schools are also proposed. The PI proposes to develop a new aircraft icing and demo experimental module that would be used in outreach activities to attract young students to engineering and science.The goal of the PI is to develop a novel technique to quantify the unsteady surface water transport process driven by boundary layer airflows over ice accreting airfoil/wing surfaces leading to safer and more efficient operation of aircrafts in icing conditions. This new experimental technique (Digital Image Projection Sensing, DIPS) is based on structured light triangulation, which is similar to stereovision techniques that provide 3D images, but it involves replacing one of the cameras for stereo imaging with a digital projector. If successful, the proposed DIPS technique will be a non-intrusive technique capable of achieving instantaneous measurements of thickness distributions of surface water droplet/rivulet flows (i.e., unsteady surf ace water transport process) over ice accreting airfoil/wing surfaces. This will provide the foundation to address challenging problems involving multiphase flow interactions with solidification. The effects of the surface properties (e.g., hydrophobicity and thermal conductivity) of aircraft wings on the surface water transport and ice formation will be studied in detail.