Multi-objective Optimization of Patterned Void Structures

图案化空隙结构的多目标优化

• 批准号: 472149-2014
• 负责人: Pasini, Damiano
• 金额: $ 4.25万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618519
• 关键词: Multi; objective; Optimization; Patterned; Void

Hot section components of gas turbine engines experience very high operating temperatures and severe thermal gradients. As a result, high stresses and strains develop within engine components, thereby limiting their life and reliability, as well as increasing engine repair and overhaul costs. Cooling air is generally used to reduce component temperature and thermal stresses. While effective, this strategy reduces the amount of air available for combustion, leading to incomplete combustion with higher NOx and CO emissions. In a recently concluded Engage project with Rolls-Royce, we reached to the conclusion that voids can be patterned in optimal shapes to reduce stress and strain in hot-section components, thereby increasing engine life. Whereas stress reduction is crucial, other aspects, such as cooling and damping, govern engine performance. As a natural extension of the Engage, this project focuses on the search of optimal void patterns that can reconcile concurrently the following performance metrics of the gas turbine: structural integrity, cooling, and damping, and be robust to variations emerging from the manufacturing process. To our knowledge, this work is novel and the first of this kind. It requires the use of analysis tools for air flow and stress, the formulation and solution of structural (size, shape and topology) optimization problems that can effectively handle multiple objectives, and the experimental validation of the results, each contributing to address the implementation of optimal cellular patterns in gas turbine engines. A successful outcome from this project will allow Rolls-Royce Canada to design engines with increased reliability while achieving increased efficiency and lower emissions. Furthermore the project will yield invaluable research insights (both fundamental and applied) in the fields of structural mechanics, topology and multi-objective optimization of patterned void structures and cellular materials at large, along with the training of highly qualified engineers, proficient in gas turbine technologies.

燃气涡轮发动机的热部部件经历非常高的工作温度和严重的热梯度。因此，发动机部件内会产生高应力和应变，从而限制其寿命和可靠性，并增加发动机维修和大修成本。冷却空气通常用于降低部件温度和热应力。这种策略虽然有效，但减少了可用于燃烧的空气量，导致不完全燃烧，导致氮氧化物和二氧化碳排放量更高。在最近与劳斯莱斯完成的 Engage 项目中，我们得出的结论是，可以将空隙设计成最佳形状，以减少热部件中的应力和应变，从而延长发动机寿命。尽管减少应力至关重要，但冷却和阻尼等其他方面也决定着发动机的性能。作为 Engage 的自然延伸，该项目专注于寻找最佳空隙模式，这些模式可以同时协调燃气轮机的以下性能指标：结构完整性、冷却和阻尼，并且对制造过程中出现的变化具有鲁棒性。据我们所知，这项工作是新颖的，也是此类工作中的首例。它需要使用气流和应力分析工具，制定和解决能够有效处理多个目标的结构（尺寸、形状和拓扑）优化问题，并对结果进行实验验证，每一项都有助于解决燃气涡轮发动机中最佳蜂窝模式的实施。该项目的成功将使劳斯莱斯加拿大公司能够设计出可靠性更高的发动机，同时提高效率并降低排放。此外，该项目还将在结构力学、拓扑和图案化空隙结构和多孔材料的多目标优化领域产生宝贵的研究见解（基​​础和应用），并培训精通燃气轮机技术的高素质工程师。