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首页> 外文期刊>Journal of Fluids and Structures >A comparative study of coupled and decoupled fan flutter prediction methods under variation of mass ratio and blade stiffness
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A comparative study of coupled and decoupled fan flutter prediction methods under variation of mass ratio and blade stiffness

机译：在质量比和叶片刚度变化下耦合和解耦风扇颤动预测方法的对比研究

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Flutter is a long standing issue for fan blades of civil aero-engines and becomes of further concern for modern light-weight designs with increasing fan diameters to reach ultra-high bypass ratios. Accurate flutter prediction is therefore of prime consideration in the design process in order to avoid catastrophic blade failure in operation or expensive redesign iterations if spotted in ground or flight tests. The traditional energy method, which is based on the assumption of negligible aeroelastic coupling, has been used to great extend to predict flutter of turbomachinery components including aero-engine fan blades, and is today by far the most widely applied technique. The underlying assumption of fluid-structure decoupling, however, has to be questioned for large fan blades that are characterized by low mass ratios and low stiffness. Implications of the violation of the system decoupling assumption on the prediction capabilities of the energy method are important to understand for the fan designer in order to allow an informed decision on the flutter prediction tool to use. In this work a comprehensive comparative study is presented in which the energy method is contrasted to the predictions of a strongly coupled fluid-structure interaction method for varying values of mass ratio and blade stiffness of a transonic three-dimensional fan rotor. The strength of aeroelastic coupling is evaluated in terms of the aeroelastic frequency shift and its impact on the prediction accuracy of the energy method is investigated. The results show the capability of the energy method to accurately predict flutter for a wide range of mass ratio and stiffness configurations, but its prediction accuracy is reduced for combined low mass ratio and low stiffness blades. Mechanisms governing the aeroelastic frequency shift are explained to allow a better understanding of the effect and a method for its prediction based on results of a decoupled analysis is shown. (C) 2018 Elsevier Ltd. All rights reserved.
机译：扑腾是民用航空发动机的风扇叶片的长期问题，并且对现代轻量级设计进一步关注，随着扇形直径增加，以达到超高旁路比率。因此，在设计过程中，精确的颤动预测是在设计过程中考虑，以避免在地面或飞行测试中发现的运行或昂贵的重新设计迭代的灾难性刮刀故障。传统的能量法基于可忽略的空气弹性耦合的假设，已被用于延伸以预测包括航空发动机风扇刀片在内的涡轮机械组件的颤动，并且是目前到目前为止最广泛应用的技术。然而，流体结构去耦的潜在假设必须针对具有低质量比和低刚度的大型风扇叶片。违反系统去耦假设对能量方法的预测能力的影响对于风扇设计师来说是非常重要的，以便允许对颤振预测工具的明智决定使用。在这项工作中，提出了一种综合的比较研究，其中能量方法与用于改变的质量比值和横向三维风扇转子的质量比值和叶片刚度的预测对比。在气动弹性频移方面评价空气弹性耦合强度，并研究了对能量方法的预测精度的影响。结果表明，能量方法能够精确地预测用于各种质量比和刚度配置的颤动，但是由于其预测精度减小了组合低质量比和低刚度叶片。解释了控制空气弹性频率变频的机制，以便更好地了解其基于解耦分析的结果的效果和其预测方法。 （c）2018年elestvier有限公司保留所有权利。

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