Blade Erosion in Automotive Gas Turbine Engine

Metwally, M.; Tabakoff, W.; Hamed, A.

doi:10.1115/1.2812774

Cited by 18 publications

(7 citation statements)

References 6 publications

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“…1 Beacher and Tabakoff 44 performed particle trajectory analyses through a multistage coal-fired gas turbine. Although no erosion predictions were available, the high concentration of particles near the casing, past the first rotor, correlated well with the observed leading edge and pressure surface wear pattern reported by Smith et al 9 Metwally et al 49 conducted a computational study to investigate the effect of blade coating on the erosion of an automotive gas turbine. Their blade surface erosion predictions indicated substantial reduction associated with rhodium platinum aluminide (CRT22B) coating compared to the base MAR-M246 alloy blade.…”

Section: Numerical Simulations Of Particle Trajectories and Blade Erosupporting

confidence: 58%

Erosion and Deposition in Turbomachinery

Hamed

Tabakoff

Wenglarz³

2006

Journal of Propulsion and Power

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286

135

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This paper presents a review of erosion and deposition research in turbomachines and the associated degradation in engine performance caused by particulate matter ingestion. Parameters affecting surface material losses as a result of erosion and development of experimental and analytical approaches to predict flowpath erosion and deposition are discussed. Tests results that quantify the effects of temperature, impact particle composition, impact velocity and angle, and surface material composition are reviewed along with particle restitution data (ratios of rebound to impact velocities and angles). Development and application of models using these data to calculate surface erosion in turbomachinery are described. These models predict particle trajectories in turbomachinery passages to determine impact rates, impact velocities, impact angles and uses the experimentally-obtained erosion data to calculate material losses. Literature on the effects of erosion on turbomachine performance and life is surveyed. Mechanisms of particle delivery and attachment upon arrival at turbomachine flowpath surfaces are also discussed along with experiential models that have been developed to predict surface deposit buildup. Delivery to turbine surfaces can occur as a result of inertial flight, as for erosion, but also through transport mechanisms involving turbulence, Brownian diffusion, and thermophoresis. The particle size range, where each of these mechanisms is dominant for delivery to surfaces, is described. The history and experience of developing models that use these mechanisms to quantify particle delivery rates to turbine flow path surfaces is discussed, along with the use of sticking fraction data to determine the amount of material retained on the surfaces after delivery and the resulting deposit buildup rates. Finally, factors that control whether extreme rates of deposition can occur in turbomachinery are described. . His early experience involved dynamics and control for gyroscopic systems and manned space stations. Later experience concerned developing and applying analytical and experimental methods to evaluate deposition, erosion, and corrosion (DEC) in advanced energy systems (e.g., gas turbines and fuel cells) operating with alternate fuels. Currently, Dr. Wenglarz is Manager of Research at SCIES for a DOE-sponsored program supporting university gas turbine research nationwide. Dr. Wenglarz has over 80 publications and presentations including invited presentations at the Von Karman

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Section: Numerical Simulations Of Particle Trajectories and Blade Erosupporting

confidence: 58%

Erosion and Deposition in Turbomachinery

Hamed

Tabakoff

Wenglarz³

2006

Journal of Propulsion and Power

Self Cite

286

135

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“…The predicted results due to Metwally et al [25] for the erosion and its related parameters over the rotor blade surfaces, show that the rotor pressure surface erosion is mainly limited to about one-third of the blade surface with a maximum at the trailing edge tip corner due to the radial centrifugation of the particles. On the other hand, the suction surface blade erosion is limited to one fourth of the blade surface at the leading edge tip.…”

Section: Resultsmentioning

confidence: 97%

Effects of Solid Particle Ingestion Through an HP Turbine

Ghenaiet¹

2012

Volume 8: Turbomachinery, Parts A, B, and C

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Modern gas turbines operate in severe dusty environments, and because of such harsh operating conditions, their blades experience significant degradation in service. This paper presents a numerical study of particle dynamics and erosion in an hp axial turbine stage. The flow field is solved separately from the solid phase and constitutes the necessary data in the particle trajectories simulations using a Lagrangian tracking model based on the finite element method. Several parameters consider a statistical description such as particle size, shape and rebound, in addition to the turbulence effect. A semi empirical erosion correlation is used to estimate erosion contours and blades deteriorations, knowing the locations and conditions of impacts. The trajectory and erosion results show high erosion rates over the pressure side of NGV near trailing edge, in addition to extreme erosion observed toward the root corner, due to high number of particles impacting with high velocities. On the suction side, erosion is mainly over a narrow strip from leading edge. Erosion in the rotor blade is shown along the leading edge and spreading over the fore of the blade suction side, owing to a flux of particles entering at high velocities and incidence. On the pressure side, regions of dense erosion are observed near the leading edge and trailing edge as well as the tip corner. Critical erosion spots seen over NGV and rotor blade are signs of a premature failure.

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“…Small solid particles from the environment, especially dust ingestion, cause SPE and impact damage to the blades and reduce engine reliability and efficiency, potentially leading to catastrophic failures during service. 7 This damage reduces the mechanical balance in rotating components and alters the fluid flow paths over the blade airfoil leading to vibration and crack propagation. 8,9 Generally, material removal mechanisms are classified into two major types of ductile and brittle.…”

Section: Introductionmentioning

confidence: 99%

Representative volume element-based simulation of multiple solid particles erosion of a compressor blade considering temperature effect

Mohammadi

Khoddami

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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Solid particle erosion is one of the main failure mechanisms of a compressor blade. Thus, characterization of this damage mode is very important in life assessment of the compressor. Since experimental study of solid particle erosion needs special methods and equipment, it is necessary to develop erosion computer models. This study presents a coupled temperature–displacement finite element model to investigate damage of a compressor blade due to multiple solid particles erosion. To decrease the computational cost, a representative volume element technique is introduced to simulate simultaneous impact of multiple particles. Blade has been made of Ti-6Al-4V, a ductile titanium-based alloy, which is impacted by alumina particles. Erosion finite element modeling is assumed as a micro-scale impact problem and Johnson–Cook constitutive equations are used to describe Ti-6Al-4V erosive behavior. In regard to a wide variation range in thermal conditions all over the compressor, it is divided into three parts (first stages, middle stages, and last stages) in which each part has an average temperature. Effective parameters on erosive behavior of the blade alloy, such as impact angle, particles velocity, and particles size are studied in these three temperatures. Results show that middle stages are the most critical sites of the compressor in terms of erosion damage. An exponential relation is observed between erosion rate and particles velocity. The dependency of erosion rate on size of particles at high temperatures is indispensable.

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Blade Erosion in Automotive Gas Turbine Engine

Cited by 18 publications

References 6 publications

Erosion and Deposition in Turbomachinery

Erosion and Deposition in Turbomachinery

Effects of Solid Particle Ingestion Through an HP Turbine

Representative volume element-based simulation of multiple solid particles erosion of a compressor blade considering temperature effect

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