Aeroacoustic Effects on The Forcing Of Fan and Compressor Blades Due to Distortion

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Hans Mårtensson, Mattias Billson
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引用次数: 0

Abstract

Abstract A distorted air stream entering an aeroengine fan or compressor leads to harmonic forces on the rotating blades. These aerodynamically induced forces are well known causes for blade vibration and associated fatigue problems. Significant levels of distortion can arise from different sources that occur at specific operating conditions as well as from upstream obstructions in the flow. Unsteady response to a specific distortion can be modeled using CFD methods to a high degree of fidelity. With a focus on understanding the aeroacoustic interaction the analyses used here considers generic harmonics of the distortion. Harmonic responses are calculated from low to transonic speeds for a range of cases. Major phenomena and driving parameters affecting the forcing strength and pressure amplitudes in the blade passage are identified from the analyses. It is demonstrated that the forcing strength is strongly affected by the cut-on/cut-off conditions upstream and downstream of the blades. Also, depending on design parameters of the blade, the aeroacoustics of the blade passage is important for the resulting forcing. The analyses used are made in 2D over a wide range of flow conditions as well as geometric variations. The results of the study provides an increased understanding of the harmonic forcing of blades. A simple model is proposed that can identify condition where increased pressure amplitudes in the blade passage may be expected. The sensitivities to parameters may also give some guidance in how design and operation can be adapted to reduce the aerodynamic forcing.
变形对风机和压气机叶片受力的气动声学影响
摘要进入航空发动机风扇或压气机的扭曲气流会对旋转叶片产生谐波力。众所周知,这些空气动力诱导的力是导致叶片振动和相关疲劳问题的原因。在特定的操作条件下,不同的来源以及流中的上游障碍物都可能产生显著程度的扭曲。对特定畸变的非定常响应可以使用CFD方法进行建模,具有很高的保真度。为了重点理解气动声相互作用,这里使用的分析考虑了畸变的一般谐波。谐波响应计算从低到跨音速的情况下的范围。通过分析,确定了影响叶片流道内压力强度和压力幅值的主要现象和驱动参数。结果表明,叶片上游和下游的切割/切断条件对叶片的强迫强度有很大影响。此外,根据叶片的设计参数,叶片通道的气动声学对产生的作用力也很重要。所使用的分析是在二维范围内的流动条件和几何变化。研究结果对叶片的谐波力有了更深入的了解。提出了一个简单的模型,该模型可以确定叶片通道中压力振幅可能增加的条件。对参数的敏感性也可以为如何设计和操作提供一些指导,以减少气动压力。
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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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