Thermo-mechanical de-icing

热机械除冰

• 批准号: 456102901
• 负责人: Professor Dr.-Ing. Markus Böl
• 金额: --
• 依托单位: Institut für Mechanik und Adaptronik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/456102901?language=en
• 关键词: Thermo; mechanical; de; icing

The removal of ice deposits on aerodynamic surfaces is a frequent challenge in aviation, which jeopardises flight safety. On the other hand, ice deposition is also a concern for stationary installations on the ground, such as wind turbines. To solve this problem, especially for modern lightweight construction with fibre composites, a novel de-icing concept is being developed. The concept is based on the working principle of shape memory alloys (SMA). The ring-shaped SMA wire is embedded in an elastomer. The alloy is activated by heat, causing the ring to contract. The contraction thus produced causes the elastomer to bulge. The heat of the thermal activation additionally increases the surface temperature and thus reduces the adhesive strength. By superimposing the mechanical (bulging) and thermal effect (temperature increase), the deposited ice is to be removed more easily and efficiently. If the heating is interrupted, the SMA wire is no longer active and cools down. Due to the spring force of the elastomer, the SMA wire deforms back to its initial position after the phase transformation.The aim of this project is to investigate in detail the concept for a thermo-mechanical de-icing system with regard to functional conformity. The elastomer and SMA must interact harmoniously in the new de-icing principle. This requires the temporal and spatial coupling of thermal and mechanical effects.Due to the unique coupled thermal and mechanical properties, SMA offers a natural hybrid de-icing system. With this project we want to thoroughly investigate the mechanisms that influence performance. This includes the improvement of individual influencing parameters such as the thermal conductivity and stiffness of the elastomer, the increase of the working frequency of the SMA. Furthermore, the new functional models will be investigated under aerodynamic load.

清除空气动力学表面上的冰沉积物是航空领域的常见挑战，这危及飞行安全。另一方面，冰沉积也是地面上的固定装置（例如风力涡轮机）的关注点。为了解决这个问题，特别是对于现代轻质结构的纤维复合材料，一种新的除冰概念正在开发中。 该概念基于形状记忆合金（SMA）的工作原理。环形SMA线嵌入在弹性体中。合金受热激活，导致戒指收缩。由此产生的收缩导致弹性体膨胀。热活化的热量额外地增加了表面温度并因此降低了粘合强度。通过叠加机械（膨胀）和热效应（温度升高），沉积的冰将被更容易和有效地去除。如果加热中断，SMA线不再活动并冷却下来。由于弹性体的弹簧力，SMA线变形回到其初始位置后，相变。本项目的目的是详细调查的概念，热机械除冰系统方面的功能一致性。在新的除冰原理中，弹性体和SMA必须协调地相互作用。这就需要在时间和空间上耦合热力效应，而形状记忆合金由于其独特的热力耦合特性，提供了一种天然的混合除冰系统。通过这个项目，我们希望彻底调查影响性能的机制。这包括改善单个影响参数，例如弹性体的导热性和刚度，SMA的工作频率的增加。此外，新的功能模型将在气动载荷下进行研究。