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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=644783
• 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.

减少二氧化碳排放的环境法规的演变加上严峻的经济背景是了解飞机发动机最新设计演变的关键因素。在竞争非常激烈的市场中，发动机制造商必须开发更高效的发动机，通常会考虑两种策略：（1）使用更轻的材料；（2）减少旋转和静态部件之间的间隙。作为提高效率的对应，间隙的减少导致发动机部件之间更频繁的结构接触，这可能引发危险的相互作用现象。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至关重要。用于分析此类相互作用的全面实验装置的成本非常高，这促使了专用预测数值方法的开发。然而，所起作用的物理现象的复杂性使得不可能使用商业软件。在这种背景下，拟议的研究项目旨在开发一种多物理方法来模拟转子/定子相互作用，并能够预测发动机规模的相互作用现象。重点关注了几个可能取得决定性突破的课题。首先，对整个发动机部件（例如压缩机和涡轮机）进行真实建模，这些部件具有制造缺陷并包括潜在的接触界面，这是进行有效数值模拟的先决条件。其次，建议模拟考虑热效应和空气动力效应的转子/定子相互作用。事实上，虽然在实验装置中已经观察到显着的温度升高，但结构相互作用现象与热效应的耦合分析尚未完成。最后，建议建立设计指南，以创建对于结构接触引起的相互作用而言稳健的叶片部件。目前业界常用的设计指南依赖于经验线性考虑，无法预测非线性相互作用。因此，与部件对结构接触的振动响应相关的新标准的定义是一个基本问题，远远超出了航空航天工业的范围。总而言之，拟议的研究项目旨在对对飞机发动机具有潜在破坏性的相互作用现象有一个基本的了解，以确保乘客的安全飞行，同时减少对环境的影响。