Rub-in processes in turbines - experimental investigation and modeling

涡轮机的磨合过程 - 实验研究和建模

• 批准号: 268769401
• 负责人: Professor Dr.-Ing. Hans-Jörg Bauer
• 金额: --
• 依托单位: Institut für Thermische Strömungsmaschinen (ITS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/268769401?language=en
• 关键词: Rub; processes; turbines; experimental; investigation

Achieving high efficiency in gas turbines requires the minimization of clearances between rotor and stator. Clearances vary constantly during operation due to e.g. thermal expansion or dynamic loads. The lack of clearance control over the entire operation cycle leads to frequent rubbing, which can critically damage rotor and stator, e.g. in the form of wear or cracking. In order to guarantee high operation safety and efficiency of the entire engine, robust sealing systems are required which are able to tolerate even heavy rubbing processes. Labyrinth seals with special honeycomb liners on the stator are able to meet these requirements. However, rubbing processes in such seals are not completely understood yet, which still prevents the development of a reliable design. Therefore, during the first funding period, a test rig was set up and used to determine the influence of rubbing parameters on resulting contact forces, temperatures and wear. The results of the experimental investigation and the determination of thermo-physical material properties of the participating materials Haynes 214 and Hastelloy X enabled the development and validation of a multiscale modelling system for simulating a rubbing event. It could be shown that the manufacturing process has a significant influence on physical material properties and the rubbing process.The aim for the second funding period is to further develop the multiscale finite element model in order to predict the behavior of complex sealing systems. For this, it is necessary to integrate the influence of the soldering method of honeycomb liners into the physical description and to consider it in the experimental investigation. The obtained physical material properties and experimental results of the rub test rig will be incorporated into the multiscale finite element model. Thus, the model serves as an important tool to completely design labyrinth sealing systems for given specification profiles and to provide reliable performance and service life prognoses in the future.

要实现燃气轮机的高效率，需要最小化转子和定子之间的间隙。间隙在运行过程中不断变化，原因如下：热膨胀或动态载荷。在整个运行周期中缺乏间隙控制会导致频繁的摩擦，这会严重损坏转子和定子，例如转子和定子。以磨损或开裂的形式。为了保证整个发动机的高运行安全性和效率，需要坚固的密封系统，能够承受剧烈的摩擦过程。定子上带有特殊蜂窝衬里的迷宫式密封件能够满足这些要求。然而，此类密封件中的摩擦过程尚未完全了解，这仍然阻碍了可靠设计的开发。因此，在第一个资助期间，建立了一个测试装置并用于确定摩擦参数对产生的接触力、温度和磨损的影响。实验研究的结果以及参与材料 Haynes 214 和 Hastelloy X 的热物理材料特性的确定使得能够开发和验证用于模拟摩擦事件的多尺度建模系统。可以看出，制造过程对物理材料特性和摩擦过程有重大影响。第二期资助的目标是进一步开发多尺度有限元模型，以预测复杂密封系统的行为。为此，有必要将蜂窝衬里焊接方法的影响纳入物理描述中，并在实验研究中予以考虑。获得的物理材料特性和摩擦试验台的实验结果将被纳入多尺度有限元模型中。因此，该模型是针对给定规格轮廓完整设计迷宫密封系统并提供可靠的性能和未来使用寿命预测的重要工具。