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Investigation of the Interaction between Blade Tip Flow and Blade Vibrations in highly loaded axial compressors

高负载轴流压缩机叶尖流与叶片振动之间相互作用的研究

基本信息

批准号：
231784390
负责人：
Dr. Lars Büttner
金额：
--
依托单位：
Fachgebiet für Gasturbinen, Luft- und Raumfahrtantriebe
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/231784390?language=en
关键词：
Investigation Interaction between Blade Tip

项目摘要

In turbomachinery, gap flow effects at the blade tips lead to large losses and stability impairments, especially for highly loaded compressor stages. The scientific investigation of these phenomena is very difficult because both the numerical and experimental methods for studying the flow reach their limits due to the complex processes in the gap. In addition, interactions occur between aerodynamic and structural-mechanical effects that could be studied and modelled only rudimentary up to now.Within this proposed project, simultaneous high-precision measurements of both the blade tip flow profile and the compressor blade vibration amplitudes and mode shapes will be enabled employing novel laser-based measurement methods. Therewith, the mechanisms of interaction between gap flow and blade vibrations will be investigated experimentally at a transonic compressor test rig alongside with numerical simulations in order to gain a better, fundamental understanding of the aeroelastic processes in turbomachinery, especially in highly loaded compressor stages.The results would be very valuable for turbo machine design, e.g. for being able to reduce the blade row spacing in future. Accordingly, higher power density and improved rotor dynamics can be achieved. This would directly allow for an increase in both operating reliability and flexibility of load changes. Furthermore the energy efficiency of future turbo machines, such as aircraft engines, could be improved.

在涡轮增压器中，叶尖处的间隙流效应导致大的损失和稳定性损害，特别是对于高负载的压气机级。这些现象的科学调查是非常困难的，因为用于研究流动的数值和实验方法都达到了极限，由于在差距中的复杂过程。此外，空气动力学和结构力学效应之间的相互作用，可以研究和建模只有初步到现在为止，在这个拟议的项目中，同时高精度测量的叶尖流动轮廓和压缩机叶片的振动幅度和模式形状将启用采用新的激光为基础的测量方法。为了更好地了解跨音速压气机尤其是高负荷压气机级的气动弹性过程，本文将在跨音速压气机试验台上对间隙流与叶片振动的相互作用机理进行试验研究，并结合数值模拟，其结果将对涡轮机械设计，例如减小叶片排间距等方面具有重要的参考价值。因此，可以实现更高的功率密度和改进的转子动力学。这将直接允许增加操作可靠性和负载变化的灵活性。此外，未来涡轮机（如飞机发动机）的能源效率可以提高。