Vortex-induced vibration effect on fatigue life estimate of turbine blades

Lau, Y. Lam; Leung, R. C. K.; So, R. M. C.

doi:10.1016/j.jsv.2007.06.029

Cited by 26 publications

(10 citation statements)

References 26 publications

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“…A number of researchers have more recently used FSI to investigate blade aeroelastic behavior in the context of flutter and forced response [13][14][15], optimize blade design parameters based on fatigue life estimates [16] and also to advance the algorithms used for computational accuracy [17].…”

Section: Blade Aeroelasticitymentioning

confidence: 99%

Aeromechanical Modeling of Rotating Fan Blades to Investigate High-Cycle and Low-Cycle Fatigue Interaction

Dhopade

Neely

2015

Journal of Engineering for Gas Turbines and Power

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Gas turbine engine components are subject to both low-cycle fatigue (LCF) and highcycle fatigue (HCF) loads. To improve engine reliability, durability and maintenance, it is necessary to understand the interaction of LCF and HCF in these components, which can adversely affect the overall life of the engine while they are occurring simultaneously during a flight cycle. A fully coupled aeromechanical fluid-structure interaction (FSI) analysis in conjunction with a fracture mechanics analysis was numerically performed to predict the effect of representative fluctuating loads on the fatigue life ofbliskfan blades. This was achieved by comparing an isolated rotor (IR) to a rotor in the presence of upstream inlet guide vanes (IGVs). A fracture mechanics analysis was used to combine the HCF loading spectrum with an LCF loading spectrum from a simplified engine flight cycle in order to determine the extent of the fatigue life reduction due to the interaction of the HCF and LCF loads occurring simultaneously. The results demonstrate the reduced fatigue life of the blades predicted by a combined loading of HCF and LCF cycles from a crack growth analysis, as compared to the effect of the individual cycles. In addition, the HCF aerodynamic forcing from the IGVs excited a higher natural frequency of vibration o f the rotor blade, which was shown to have a detrimental effect on the fatigue life. The findings suggest that FSI, blade-row interaction and HCF I LCF interaction are important considerations when predicting blade life at the design stage of the engine. The lack of available experimental data to validate this problem emphasizes the utility of a numerical approach to first examine the physics of the problem and second to help establish the need for these complex experiments.

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Section: Blade Aeroelasticitymentioning

confidence: 99%

Aeromechanical Modeling of Rotating Fan Blades to Investigate High-Cycle and Low-Cycle Fatigue Interaction

Dhopade

Neely

2015

Journal of Engineering for Gas Turbines and Power

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“…the wake excitation. A lot of studies about the wake excitation and its induced vibration have been carried out, to name a few, Lau [1] used the Karman vortex street (KVS) to model the wake excitation and analyzed the vortex-induced vibrations of a 2D airfoil. García [2] numerically calculated the wake excitation acting on the rotor blade of the last stage of 110MW steam turbine.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Strength of the Wet Steam Turbine Blade

et al. 2018

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Abstract.A method to examine the influences of inlet wetness fraction and inlet angle on the strength performance of the rotating blade considering the effects of wet steam non-equilibrium condensation was proposed. A wildly verified numerical model was employed to simulate the wet steam flow to obtain the pressure distribution on the blade surface. Based on the finite element method, the strength analysis was carried out. Results show that the von-Mises stress of the rotor blade would increase with the inlet wetness fraction and the inlet angle. The sensitive range of studied inlet condition is located atwhich the increases of the von-Mises stress are over 40%.

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“…3 and Lau et al. 4 presented the blade flutter behavior in numerical method, and investigated the aeroelastic characteristic of vibrating blade assemblies. Gu et al.…”

Section: Introductionmentioning

confidence: 99%

“…After that, aeroelasticity and thermodynamics have received considerable attention from domestic and foreign scholars. Carstens et al 3 and Lau et al 4 presented the blade flutter behavior in numerical method, and investigated the aeroelastic characteristic of vibrating blade assemblies. Gu et al 5 studied the heat transfer influence on compressor performance, a conjugate heat transfer analysis was performed with computational fluid dynamics techniques.…”

Section: Introductionmentioning

confidence: 99%

Multi-field coupling dynamic characteristics based on Kriging interpolation method

Yang

Yuan

Zhao

2016

Proceedings of the Institution of Mechanical Engineers, Part G:

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Multi-field coupling problems are taken more and more attention mainly because of the higher requirement of load, efficiency, and reliability in aero-engine operation. This research takes an aero-engine compressor as the research object, 3D flow field and structural models are established. For the method of cyclic symmetric, single-sector model is selected as the calculation domain. Considering the influence of former stator wakes, compressor flow field is simulated. The article analyzes the distribution law of unsteady aerodynamic load on rotor blade. Based on Kriging model, load transfer of aerodynamic pressure and temperature is achieved from flow field to blade structure. Then the effects of centrifugal force, aerodynamic pressure and temperature load are discussed on compressor vibration characteristic and structural strength. The results show dominant fluctuation frequencies of aerodynamic load on rotor blade are manly at frequency doubling of stator-rotor interaction, especially at one time frequency (1 Â f 0 ). Magnitude and pulsation amplitude on pressure surface are far greater than that on suction surface. Load transfer with Kriging model has a higher precision, it can meet the requirement of multi-field coupling dynamic calculation. In multi-field coupling interaction, temperature load makes the natural vibration frequencies decrease obviously, centrifugal force is the main source of deformation and stress. Bending stress induced by aerodynamic pressure and temperature load can counteract part of bending stress induced by centrifugal force. However, temperature load causes the maximum displacement of blade-disk system to increase.

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Vortex-induced vibration effect on fatigue life estimate of turbine blades

Cited by 26 publications

References 26 publications

Aeromechanical Modeling of Rotating Fan Blades to Investigate High-Cycle and Low-Cycle Fatigue Interaction

Aeromechanical Modeling of Rotating Fan Blades to Investigate High-Cycle and Low-Cycle Fatigue Interaction

Numerical Analysis of the Strength of the Wet Steam Turbine Blade

Multi-field coupling dynamic characteristics based on Kriging interpolation method

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