The broad study of blade cascade under controlled torsional flutter: Dynamics of the flow and stability analysis

IF 2.5 3区工程技术 Q2 MECHANICS

European Journal of Mechanics B-fluids Pub Date : 2024-09-06 DOI:10.1016/j.euromechflu.2024.08.006

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Abstract

The experimental and numerical investigation of the flow instabilities acting on rigid blades and vice versa was conducted for both compressor and turbine configuration. The blade cascade consisted of five rectangular NACA 0010 blades, with three middle blades capable of performing harmonic motion with one degree of freedom (pitching) using force excitation. The base case (all blades fixed) and excited regime were examined. The influence of various angles of attack, harmonic frequency values, amplitude values, inter-blade phase angles and Reynolds numbers (Re) were tested. The mean flow properties as well as the fluid - structure interaction (FSI) were studied using Particle Image Velocimetry (PIV), Reynolds-averaged Navier-Stokes (RANS) CFD methods and using force measurement. Additionally, two different approaches, namely traveling wave mode (TWM) and aerodynamic influence coefficient (AIC), were adopted to estimate the aeroelastic stability of the blade cascade, and the results were compared. The results show significant aeroelastic coupling between the blades in both compressor and turbine configuration. However, the aerodynamic coupling effect for torsional flutter is more prominent in turbine configuration.

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受控扭转扑动下叶片级联的广泛研究：流动动力学和稳定性分析

针对压缩机和涡轮机配置，对作用于刚性叶片和反作用于刚性叶片的流动不稳定性进行了实验和数值研究。叶片级联由五个矩形 NACA 0010 叶片组成，中间三个叶片能够利用力激励进行单自由度（俯仰）谐波运动。研究了基本情况（所有叶片固定）和激励机制。测试了各种攻角、谐波频率值、振幅值、叶片间相位角和雷诺数（Re）的影响。使用粒子图像测速仪 (PIV)、雷诺平均纳维-斯托克斯 (RANS) CFD 方法和力测量法研究了平均流动特性以及流体-结构相互作用 (FSI)。此外，还采用了两种不同的方法，即行波模式（TWM）和气动影响系数（AIC）来估算叶片级联的气动弹性稳定性，并对结果进行了比较。结果表明，在压气机和涡轮机配置中，叶片之间都存在明显的气动弹性耦合。然而，在涡轮配置中，扭转扑动的气动耦合效应更为突出。

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来源期刊

European Journal of Mechanics B-fluids 物理-力学

CiteScore

5.90

自引率

3.80%

发文量

127

审稿时长

58 days

期刊介绍： The European Journal of Mechanics - B/Fluids publishes papers in all fields of fluid mechanics. Although investigations in well-established areas are within the scope of the journal, recent developments and innovative ideas are particularly welcome. Theoretical, computational and experimental papers are equally welcome. Mathematical methods, be they deterministic or stochastic, analytical or numerical, will be accepted provided they serve to clarify some identifiable problems in fluid mechanics, and provided the significance of results is explained. Similarly, experimental papers must add physical insight in to the understanding of fluid mechanics.

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