Diagnostic and failure analysis in blades of a 300 MW steam turbine

Segura, J.A.; Castro, Laura; Rosales, I.; Rodríguez, José Ignacio Herrera; Urquiza, G.; Rodríguez, J.M.

doi:10.1016/j.engfailanal.2017.04.039

Cited by 31 publications

(6 citation statements)

References 9 publications

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“…), L2 is essentially pure magnetite by virtue of its growing by outward diffusion of iron ions. The mechanisms of erosion wear of metals and refractory by solid particles in coal-fired boilers has been briefly reviewed (Segura et al, 2017). In general, two basic mechanisms have been identified for the erosive wear of metals at room temperature (Graciano et al, 2023;Quintanar-Gago et al, 2021).…”

Section: Conditions For the Growth Of Oxidesmentioning

confidence: 99%

Development of expression for resistance to erosion by solid particles in turbine blades

Perez-Castañeda,

Garcia-Morales,

Camaraza-Medina

2023

CT&F Cienc. Tecnol. Futuro

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The application of reliability centered maintenance onrepairable equipment requires that the reliability calculation should not to be based on failure statistics, as in traditional methods, but rather on its condition. The "load vs resistance" method presumesthe comparison of process parameters with carefully selected mechanical properties of the materials. The author proposes the calculation based on parameters monitored for diagnosis purposes. Specifically, he analyzes the erosion of steam turbine bladessubject tothe action of solid particle from the superheaters, which, under certain conditions, grow to critical thicknesses and due to stresssactionscaused by thermal changes, fracture and detach, acquiring such energy that then impacts the surface of the blades causing theirerosion. These phenomena are analyzed and equations are established in relation withthe mechanical properties of the blade metal , with the energy requird by oxide flakes to cause their erosion. An expression has been obtained, allowing for the application of the method, whichd has not been found in analyzed research works.

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Section: Conditions For the Growth Of Oxidesmentioning

confidence: 99%

Development of expression for resistance to erosion by solid particles in turbine blades

Perez-Castañeda,

Garcia-Morales,

Camaraza-Medina

2023

CT&F Cienc. Tecnol. Futuro

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“…The indicators of failure in turbines include surface damage, fatigue, wear, and corrosion, and mostly occur at the hot sections like the blades [11,13]. These failures are generally classified as fatigue failure, thermomechanical fatigue failure, creep failure, corrosion failure, and erosion failure.…”

Section: Introductionmentioning

confidence: 99%

Impact of Cooling Fluid Temperature on the Structural Integrity of Gas Turbine Stator Blades

Towoju

2023

ETJ

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Gas turbine engines demand efficient cooling due to high temperatures and material constraints from combusted gases in aircraft • Optimum performance and prevention of thermal gradients require controlled cooling, as internal cooling alone is insufficient • The study highlights the importance of additional measures to ensure efficient cooling and prevent parts failureThe importance of gas turbine engines to the aviation industry cannot be overemphasized. Being a major part of aircrafts and jets, its reliability must be second to none. They are continuously subjected to extreme conditions during service making them the subject of constant studies. To produce the thrust and torque power required of them, they have to convert the intense heat and pressure inherent in hot combustion gases. To withstand the high combustion gas temperature without thermal failure, specialized materials and cooling are employed. This study numerically investigated the effect of cooling fluid temperature on the structural integrity of a (DS) GTD111 alloy gas turbine stator blade using COMSOL 5.5 software. Air was used as the cooling fluid in this study.The duct passages of the stator blade are significantly affected by the cooling fluid temperature values. Lower values of cooling fluid temperature proved beneficial for keeping the stator blade material below its metallurgical limit and is a positive for its total displacement, it however, negatively affects the yielding of the material. The cooling fluid temperature can be optimally selected to give optimal cooling effects in terms of total displacement and stress development. Based on this study, a cooling fluid (air) temperature of about 660 K will give optimal results. Internal cooling alone is not sufficient to produce the required cooling for turbine stator blades and this is evident in the output of the study, thus, coating and film cooling must be carried out to prevent thermal failure during service.

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“…The vibrating condition plays an important role in the crack initiation and development in the rotating blade [2]. The high cycled fatigue and vibration stresses are played a key role in the blade failure [3] . area of research, and the vibration is the key aspect to consider along with the temperature.…”

Section: Introductionmentioning

confidence: 99%

Vibration characteristic of rotating composite blade: A Numerical approach

2022

jecet

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Coating on turbine blade plays a vital role to enhance the mechanical properties; in order to this, the current work represents vibration characteristics for the coated rotating blade. Considering the temperature dependent material properties and stress hardening effect, natural frequencies are obtained using a finite element numerical approach. The dynamic behavior is studied for the coated and uncoated blade. The vibration response of the rotating coated blade is studied and observed the softening in frequencies as rise in the temperature.

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Diagnostic and failure analysis in blades of a 300 MW steam turbine

Cited by 31 publications

References 9 publications

Development of expression for resistance to erosion by solid particles in turbine blades

Development of expression for resistance to erosion by solid particles in turbine blades

Impact of Cooling Fluid Temperature on the Structural Integrity of Gas Turbine Stator Blades

Vibration characteristic of rotating composite blade: A Numerical approach

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