Experiments On Tuned UHBR Open-Test-Case Fan ECL5/CATANA: Stability Limit

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL Journal of Engineering for Gas Turbines and Power-transactions of The Asme Pub Date : 2023-10-11 DOI:10.1115/1.4063717
Anne Lise Fiquet, Alexandra Schneider, Benoit Paoletti, Xavier Ottavy, Christoph Brandstetter
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Abstract

Abstract Research of the past decades has shown that the operating range of modern fans and compressors is often limited by aeroelastic phenomena before the onset of pure aerodynamic instability. Prediction of these mechanisms is challenging for state-of-the-art numerical methods, particularly for configurations with flexible wide-chord blades. To provide a benchmark configuration for the community, the composite-material fan stage ECL5, representative of near future Ultra-High-Bypass Ratio architectures, has been designed at Ecole Centrale de Lyon and recently shared as an open-test-case. In research program CATANA, different configurations with variable tuning and intake geometries are investigated experimentally, and here we present a comprehensive aeroelastic study of the tuned reference configuration. The study encompasses the investigation of the whole subsonic and transonic operating range using multi-physical instrumentation. A characterization of structural properties under running conditions is analyzed in comparison to individual blade measurements and FEM-predictions. The stability limit is investigated at different speedlines. At transonic conditions, rotating stall occurred without aeroelastic precursors. Severe non-synchronous-vibrations were observed at subsonic speeds and limited the operating range before the onset of rotating stall. Through a detailed analysis of the aeroelastic coupling mechanism, a full characterization of interacting modes is presented. The challenging prediction of this coupled phenomenon and the discrepancy to aeroelastic simulations are discussed. The results are a promising benchmark for future method development, particularly involving high-fidelity methods.
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调谐UHBR开放测试用例风扇ECL5/CATANA的实验:稳定性极限
摘要过去几十年的研究表明,在纯气动失稳发生之前,现代风机和压气机的工作范围往往受到气动弹性现象的限制。对于最先进的数值方法来说,预测这些机制是具有挑战性的,特别是对于具有柔性宽弦叶片的配置。为了为社区提供基准配置,复合材料风扇级ECL5是近期超高涵道比架构的代表,由里昂中央学院设计,最近作为开放测试案例分享。在CATANA研究项目中,我们对不同配置的可变调谐和进气几何形状进行了实验研究,在此我们对调谐后的参考配置进行了全面的气动弹性研究。该研究包括使用多物理仪器对整个亚音速和跨音速工作范围的调查。分析了运行条件下结构性能的特征,并与单个叶片测量和fem预测进行了比较。研究了不同速度线下的稳定性极限。在跨音速条件下,旋转失速发生时没有气动弹性前体。在亚音速下观察到严重的非同步振动,限制了旋转失速发生前的操作范围。通过对气动弹性耦合机理的详细分析,给出了相互作用模态的完整表征。讨论了这种耦合现象的预测挑战以及与气动弹性模拟的差异。结果为未来的方法开发提供了一个有希望的基准,特别是涉及高保真度的方法。
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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