Glaciated Ice Icing and Shedding in Gas Turbine Compressors

最近发生的几起喷气式发动机功率损失事件都与吸入积聚在发动机元件上的高海拔小冰晶有关。这些沉积物破坏气流，造成性能损失，如果它们在断裂之前变得很大，则会造成严重的损害。之前的事故导致了新的认证要求的发布，这使得工业界有责任设计新的抗冰发动机。该项目是数值和实验相结合的，旨在进一步表征冰的增加，特别是冰的脱落过程，填补科学和工业知识的空白。它将在发动机结冰的计算机模拟套件中引入一个强大的基于物理的脱落模型。为了验证这一模型，将进行一项具有发动机代表性几何形状的实验活动——目前对脱落前冰的增加程度和对发动机结构的敏感性知之甚少，而且很少测量。该工具将使行业能够更好地预测冰的积聚位置，并使未来的发动机设计能够很好地控制冰沉积。

Several recent jet engine power loss events have been linked to the ingestion of small high-altitude ice crystals which build up on engine elements. These deposits disrupt airflow and cause a performance loss and cause severe damage if they become large prior to breaking off. Previous incidents have led to the release of new certification requirements which places the onus in industry to design new ice-resilient engines.This project is both numerical and experimental and aims to further characterise ice accretion and in particular the ice shedding process, filling scientific and industrial knowledge gaps. It will introduce a robust physics-based shedding model into a computer simulation suite for engine icing. To validate this model an experimental campaign with engine representative geometries will be conducted - the extent of ice accretion prior to shedding and sensitivity to engine architecture is currently poorly understood and rarely measured. This tool will allow industry to predict the build-up locations of ice better and enable the design of future engines where ice deposition is well controlled.