Advances in fan and compressor blade flutter analysis and predictions

Mikolajczak, A. A.; Arnoldi, R. A.; Snyder, Lynn E.; Stargardter, H.

doi:10.2514/3.44451

Cited by 62 publications

(21 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exact mechanism was identified by examining the ratio of the unsteady pressures and axial velocities in the duct domain. (Mikolajczak et al 1975). …”

Section: (B ) Flutter Analysismentioning

confidence: 93%

Computational aeroelastic modelling of airframes and turbomachinery: progress and challenges

Bartels

Sayma

2007

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Computational analyses such as computational fluid dynamics and computational structural dynamics have made major advances towards maturity as engineering tools. Computational aeroelasticity (CAE) is the integration of these disciplines. As CAE matures, it also finds an increasing role in the design and analysis of aerospace vehicles. This paper presents a survey of the current state of CAE with a discussion of recent research, success and continuing challenges in its progressive integration into multidisciplinary aerospace design. It approaches CAE from the perspective of the two main areas of application: airframe and turbomachinery design. An overview will be presented of the different prediction methods used for each field of application. Differing levels of nonlinear modelling will be discussed with insight into accuracy versus complexity and computational requirements. Subjects will include current advanced methods (linear and nonlinear), nonlinear flow models, use of order reduction techniques and future trends in incorporating structural nonlinearity. Examples in which CAE is currently being integrated into the design of airframes and turbomachinery will be presented.

show abstract

“…The exact mechanism was identified by examining the ratio of the unsteady pressures and axial velocities in the duct domain. (Mikolajczak et al 1975). …”

Section: (B ) Flutter Analysismentioning

confidence: 93%

Computational aeroelastic modelling of airframes and turbomachinery: progress and challenges

Bartels

Sayma

2007

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…2, 3) have been shown to be remarkably successful at predicting the, observed flutter behavior of supersonic test fans. 1 ' 4 As a result, it is generally believed that the development of a supersonic unstalled flutter prediction system is well in hand. In contrast, for subsonic flow, the classical approach has not provided practically useful flutter predictions and it appears that a more comprehensive aerodynamic model will be required.…”

Section: Introductionmentioning

confidence: 99%

Subsonic Flow Past an Oscillating Cascade with Finite Mean Flow Deflection

Verdon

Caspar

1980

AIAA Journal

View full text Add to dashboard Cite

A theoretical model for predicting the aerodynamic response due to a finite-deflection cascade oscillating in a subsonic stream is described. Based on the assumption of small amplitude harmonic blade motions, the unsteady flow is treated as a small fluctuation about the nonuniform mean flow. The mean or steady flow is determined as a solution of the full potential equation while the unsteady flow is governed by a linear equation with variable coefficients which depend on the steady flow field. Numerical solutions based on this general aerodynamic model have been obtained for simple cascade configurations. Selected results for sharp-edged blade profiles are described. Those for flat plate cascades are shown to be in good agreement with previous analytical predictions for both subresonant and superresonant blade motions. Predictions for double circular arc and thin circular arc profiles reveal that blade thickness has a significant effect on the unsteady response while the effect of flow turning due to blade camber is only minimal.

show abstract

“…Flutter in the compressor blades ultimately limits the blade speed and, thus, the maximum fluid dynamic throughput of the compressor. 2 ' 3 In order to understand the fluid mechanics of blade flutter, the actual motion of each blade must be studied. Although vibrational motion of a blade can be studied using a variety of techniques when the blade is at rest, monitoring of blade vibration while the compressor is turning several thousand rpm proves a much more formidable problem.…”

Section: Introductionmentioning

confidence: 99%

An optical technique for measuring vibratory motion in rotating machinery

Bien

Camac

1977

AIAA Journal

View full text Add to dashboard Cite

A method to measure the frequency and amplitude of vibration in a rotating element is presented. Using optical interferometric techniques, the flexure and torsion of a gas turbine compressor blade is shown to be measurable over the entire 360 deg of rotation. Vibrations are shown to be measurable independent of blade rotation speed; the effects of misalignment in system are shown to be small. Angular deflections from 0.5 to 500 mrad were measured in the test system.

show abstract

Advances in fan and compressor blade flutter analysis and predictions

Cited by 62 publications

References 4 publications

Computational aeroelastic modelling of airframes and turbomachinery: progress and challenges

Computational aeroelastic modelling of airframes and turbomachinery: progress and challenges

Subsonic Flow Past an Oscillating Cascade with Finite Mean Flow Deflection

An optical technique for measuring vibratory motion in rotating machinery

Contact Info

Product

Resources

About