Composition dependent model for the prediction of syngas ash deposition in turbine gas hotpath

Sreedharan, Sai Shrinivas; Tafti, Danesh K.

doi:10.1016/j.ijheatfluidflow.2010.10.006

Cited by 52 publications

(18 citation statements)

References 29 publications

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“…This resulted in a much larger amount of deposition at the leading edge than that on the windward and lee sides. Sreedharan and Tafti [22] conducted numerical simulations of ash deposition on a flat plate oriented at 45 deg to an impinging ash laden jet. The obtained results were validated by experiments from Crosby et al [11].…”

Section: The Effect Of Mainstream Velocitymentioning

confidence: 99%

“…When the particle viscosity is less than or equal to the critical value, the sticking probability value is assumed to be 100%, whereas for higher particle viscosity, capture efficiency decreased with increasing particle viscosity. Based on the latter model, Sreedharan and Tafti [22] investigated the deposition of ash particles impinging on a flat of 45 • wedge-shape geometry numerically. They found that the majority of the ash deposition occurred near the stagnation region and capture efficiency increased with increase in jet temperature.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Particle Deposition on Surface at Different Mainstream Velocity and Temperature

Zhang¹,

Liu²,

Liu³

et al. 2019

Energies

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The effect of mainstream velocity and mainstream temperature on the behavior of deposition on a flat plate surface has been investigated experimentally. Molten wax particles were injected to generate particle deposition in a two-phase flow wind tunnel. Tests indicated that deposition occurs mainly at the leading edge and the middle and backward portions of the windward side. The mass of deposition at the leading edge was far more than that on the windward and lee sides. For the windward and lee sides, deposition mass increased as the mainstream velocity was increased for a given particle concentration. Capture efficiency was found to increase initially until the mainstream velocity reaches a certain value, where it begins to drop with mainstream velocity increasing. For the leading edge, capture efficiency followed a similar trend due to deposition spallation and detachment induced by aerodynamic shear at high velocity. Deposition formation was also strongly affected by the mainstream temperature due to its control of particle phase (solid or liquid). Capture efficiency initially increased with increasing mainstream temperature until a certain threshold temperature (near the wax melting point). Subsequently, it began to decrease, for wax detaches from the model surface when subjected to the aerodynamic force at the surface temperature above the wax melting point.

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Section: The Effect Of Mainstream Velocitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of Particle Deposition on Surface at Different Mainstream Velocity and Temperature

Zhang¹,

Liu²,

Liu³

et al. 2019

Energies

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show abstract

“…At high temperatures, a particle no longer can be considered completely solid and has viscoelastic properties. In order to capture this, as well as sensitize deposition to high temperatures, a critical viscosity model was proposed that defined the probability of a particle sticking based on the viscosity of a particle [28].…”

Section: 32: Modeling Depositionmentioning

confidence: 99%

The Effect of Particle Size on Deposition in an Effusion Cooling Geometry

Wolff

Bowen

Bons

2018

2018 AIAA Aerospace Sciences Meeting

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The effect of particle size on particle accumulation within an effusion cooling geometry common to gas turbines was investigated experimentally and computationally.A flat plate with an effusion cooling hole array based on a gas turbine combustor liner was subjected to particulate laden flow in an accelerated deposition facility. The tests were conducted at an engine relevant plate temperature of 1118 K, coolant temperature of 950 K, and held at a constant pressure ratio of 1.03 (cavity to ambient). To elucidate the effect of particle size, six unique size distributions of Arizona Road Dust (ARD) smaller than 20 micron were introduced to the flow independently. Experiments were also conducted in which two different dust size distributions were sequentially delivered to the test article. These experiments clearly indicate that the smallest particles within the range tested accumulate within the hole creating deposit structures and blocking the effusion holes. They also indicate that larger particles within this range can have an erosive effect on the deposit structures as they build, changing the structure's morphology and blockage behavior.Computational fluid domains were developed to replicate the test article geometry before and after a test to investigate the effect that deposit structures have on deposition.Particles were introduced to these domains after reaching a steady solution and were tracked through the solution with a Lagrangian trajectory solver. The impact locations of iv the particles were recorded and a particle sticking model was employed to determine if the particles stick or rebound. The domain with the clean hole showed that the smallest particles impact and were prone to sticking in the area where deposits form experimentally. As the particles increase in size, the number of impacts and likelihood of sticking decreased. The domain with scoop deposit structures showed that these structures can change the particle impact trajectories influencing the buildup process.Overall, this body of work shows that particle size distribution has a first order effect on the blockage caused by particle deposition in effusion cooling geometries. The observation that 0.5-3 μm particles are primarily responsible for blockage while large particles can reduce deposit structure size highlights the complexity of particle deposition. This has significant implications for future work, particularly high fidelity modeling.v

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“…One model is the critical viscosity model, which calculates the sticking probability by considering particle viscosity. Sreedharan and Tafti [18] proposed a critical viscosity model to predict sticking probability of sand particles on a wedge-shaped target. The sticking probability calculated by this model showed good agreement with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of particle deposition in film-cooled blade leading edge

Wang

Tian

Zhu

et al. 2020

Numerical Heat Transfer, Part A: Applications

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This study numerically investigates film-cooling performance and particle trajectories in AGTB (two rows of cylindrical holes equipped on suction side (SS) and pressure side (PS) of the leading edge, respectively) turbine cascade. Particle deposition on a turbine blade is analyzed by calculations of capture efficiency and impact efficiency. The turbulent flow is modeled by the Realizable k-e turbulence model, and the discrete phase model (DPM) with user-defined functions (UDFs) is used to simulate the particle motions. An invasion efficiency is proposed to analyze the possibility of particle invasion into the film hole. Comparisons of various particles with diameters of 1 mm, 5 mm, 10 mm, 20 mm, and 50 mm, respectively, are conducted for four blowing ratios (0.53, 0.93, 1.31, 1.63) and three inlet flow angles (123 , 133 , and 143). It is observed that with a small inlet flow angle and a large blowing ratio, the capture efficiency on the PS decreases. It is found that smaller particle size results in lower invasion efficiency, and larger particles are more likely to invade into the film-cooling hole especially at a low blowing ratio.

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Composition dependent model for the prediction of syngas ash deposition in turbine gas hotpath

Cited by 52 publications

References 29 publications

Experimental Study of Particle Deposition on Surface at Different Mainstream Velocity and Temperature

Experimental Study of Particle Deposition on Surface at Different Mainstream Velocity and Temperature

The Effect of Particle Size on Deposition in an Effusion Cooling Geometry

Numerical investigation of particle deposition in film-cooled blade leading edge

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