Towards a multi-physics numerical strategy dedicated to the prediction of rotor/stator interactions within modern turbomachines

致力于预测现代涡轮机中转子/定子相互作用的多物理场数值策略

• 批准号: RGPIN-2016-06390
• 负责人: Batailly, Alain
• 金额: $ 2.77万
• 依托单位: École Polytechnique de Montréal
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=638691
• 关键词: Towards; multi; physics; numerical; strategy

The evolution of environmental regulations for the reduction of CO2 emissions combined with a tough economic context are key factors for understanding recent design evolutions of aircraft engines. In a very competitive market, engine manufacturers must develop more efficient engines and two strategies are usually considered: (1) the use of lighter materials and (2) the reduction of clearances between rotating and static components. As a counterpart of an improved efficiency, the reduction of clearances yields more frequent structural contacts between the engine components which may initiate hazardous interaction phenomena. The ability to predict and mitigate these interactions has thus become imperative for engine manufacturers. The very high cost of full-scale experimental set-ups for analyzing such interactions motivates the development of dedicated predictive numerical methods. However, the complexity of the physical phenomena at play makes it impossible to use commercial softwares. In this context, the proposed research project aims at developing a multi-physics approach for the simulation of rotor/stator interactions, with the ability to predict interaction phenomena at the engine scale. It focuses on a few topics for which decisive breakthrough may be achieved. First of all, the realistic modeling of full engine components such as a compressor and a turbine featuring their manufacturing imperfections and including potential contact interfaces is a prerequisite for carrying out efficient numerical simulations. Second, it is proposed to simulate rotor/stator interactions accounting for thermal and aerodynamic effects. In fact, while significant temperature increase has been witnessed on experimental set-ups, the coupled analysis of structural interaction phenomena with thermal effects is yet to be done. Finally, it is proposed to establish design guidelines in order to create bladed components robust with respect to interactions stemming from structural contacts. Current design guidelines commonly used in the industry rely on empirical linear considerations that fail to predict non-linear interactions. The definition of new criteria related to the component vibratory response to structural contacts is thus a fundamental issue and goes way beyond the scope of the aerospace industry. Taken all together, the proposed research project aims at gaining a fundamental understanding of interaction phenomena that are potentially destructive for an aircraft engine, in order to ensure a safe flight for passengers while reducing their environmental impact.

环境法规减少二氧化碳排放以及艰难的经济环境的发展是理解飞机发动机最新设计发展的关键因素。在竞争激烈的市场中，发动机制造商必须开发更有效的发动机，并且通常会考虑两种策略：（1）使用较轻的材料和（2）旋转和静态组件之间的间隙减少。作为提高效率的对应物，降低间隙会在发动机组件之间产生更频繁的结构接触，这可能会引发有害的相互作用现象。因此，预测和减轻这些相互作用的能力对于发动机制造商来说已经成为必要的。用于分析此类相互作用的全尺度实验设置的非常高的成本激发了专用的预测数值方法的发展。但是，发挥作用的物理现象的复杂性使得不可能使用商业软件。在这种情况下，拟议的研究项目旨在开发一种多物理学方法来模拟转子/定子相互作用，并能够在发动机尺度上预测相互作用现象。它重点介绍了可能取得决定性突破的一些主题。首先，完整的发动机组件的现实建模，例如压缩机和具有制造缺陷的涡轮机以及包括潜在的接触接口的涡轮机是进行有效的数值模拟的先决条件。其次，建议模拟转子/定子相互作用，以说明热力学效应和空气动力学效应。实际上，尽管在实验设置上已经看到了大幅度升高，但对具有热效应的结构相互作用现象的耦合分析尚待进行。最后，建议建立设计准则，以创建与结构接触的相互作用相互作用的叶片组件。业界通常使用的当前设计指南取决于无法预测非线性相互作用的经验线性考虑因素。因此，与结构接触的组件振动响应有关的新标准的定义是一个基本问题，并且超出了航空航天行业的范围。拟议的研究项目综合起来，旨在获得对互动现象的基本理解，这些现象对飞机发动机可能具有破坏性，以确保为乘客提供安全的飞行，同时减少环境影响。