Coating Effect on Particle Trajectories and Turbine Blade Erosion

Tabakoff, W.; Metwally, M.

doi:10.1115/1.2906580

Cited by 15 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A study on sand ingestion in an axial fan by Ghenaiet et al [6] indicated that after a 6 hour sand ingestion test, there was a 7% reduction in adiabatic efficiency. This paper provides a methodology and test results conducted on a simple test coupon representative of an airfoil leading edge, which is one of the most difficult areas to cool and one of the most susceptible areas to sand blockage as shown in studies on external deposition tests by Tabakoff et al [7] and Kim et al [2]. The test coupon contains an array of film-cooling holes with a typical diameter and orientation as seen in a leading edge of a turbine vane.…”

Section: Gt2006-90067mentioning

confidence: 99%

Effects of Sand Ingestion on the Blockage of Film-Cooling Holes

Walsh

Thole

Joe

2006

Volume 3: Heat Transfer, Parts a and B

View full text Add to dashboard Cite

Gas turbines are often subjected to conditions where dirt and sand are ingested into the engine during takeoffs and landings. Given most aero engines do not have filtration systems, particulates can be present in both the main gas path and coolant streams. Particulates can block coolant passages and film-cooling holes that lead to increased airfoil temperatures caused by reduced coolant available for a given pressure ratio across the cooling holes. This study investigated the effects of sand blockage on film-cooling holes placed in a leading edge coupon. The coupon was tested to determine the reduction in flow parameter for a range of pressure ratios, coolant temperatures, metal temperatures, number of cooling holes, sand amounts, and sand diameters. Depending upon conditions, blockages characterized by reduced coolant flow can be as high as 10%.

show abstract

Section: Gt2006-90067mentioning

confidence: 99%

Effects of Sand Ingestion on the Blockage of Film-Cooling Holes

Walsh

Thole

Joe

2006

Volume 3: Heat Transfer, Parts a and B

View full text Add to dashboard Cite

show abstract

“…Such situations arise in various industries such as the oil and gas production industry, aeronautical, power station, etc. [2][3][4][5][6][7][8][9][10][11]. It has been estimated that in power stations, solid particle erosion costs American utilities over $150 million annually due to reduction of efficiency, heat loss and maintenance and repair costs [12].…”

Section: Background and Motivationmentioning

confidence: 99%

Experimental and Numerical Study of Single and Multiple Impacts of Angular Particles on Ductile Metals

Takaffoli¹

2023

Preprint

View full text Add to dashboard Cite

Solid particle erosion occurs when small high speed particles impact surfaces. It can be either destructive such as in the erosion of oil pipelines by corrosion byproducts, or constructive such as in abrasive jet machining processes. Two dimensional finite element (FE) models of single rhomboid particles impact on a copper target were developed using two different techniques to deal with the problem of element distortion: (i) element deletion, and (ii) remeshing. It was found that the chip formation and the material pile-up, two phenomena that cannot be simulated using a previously developed rigid-plastic model, could be simulated using the FE models, resulting in a good agreement with experiments performed using a gas gun. However, remeshing in conjunction with a failure model caused numerical instabilities. The element deletion approach also induced errors in mass loss due to the removal of distorted elements. To address the limitations of the FE approach, smoothed particle hydrodynamics (SPH) which can better accommodate large deformations, was used in the simulation of the impact of single rhomboid particles on an aluminum alloy target. With appropriate constitutive and failure parameters, SPH was demonstrated to be suitable for simulating all of the relevant damage phenomena observed during impact experiments. A new methodology was developed for generating realistic three dimensional particle geometries based on measurements of the size and shape parameter distributions for a sample of 150 µm nominal diameter angular aluminum oxide powder. The FE models of these generated particles were implemented in a SPH/FE model to simulate non-overlapping particle impacts. It was shown that the simulated particles produced distributions of crater and crater lip dimensions that agreed well with those measured from particle blasting experiments. Finally, a numerical model for simulating overlapping impacts of angular particles was developed and compared to experimental multi-particle erosion tests, with good agreement. An investigation of the simulated trajectory of the impacting particles revealed various erosion mechanisms such as the micromachining of chips, the ploughing of craters, and the formation, forging and knocking off crater lips which were consistent with previously noted ductile solid particle erosion mechanisms in the literature.

show abstract

“…0~4 、 0~4 are all experimental constants related to the material propertites of the particle and solid surface. In this work, those constants are adopted according to Table 1 recommended by Tabakoff and Metwally(1992). Table 1 Particle rebounding constants…”

Section: Reflecting Mechnismmentioning

confidence: 99%

The Effect of Ash Deposition on a Transonic Turbine Guide Vane

Zheng¹,

Sun²,

Yang³

2019

Proceedings of Global Power &Amp; Propulsion Society

View full text Add to dashboard Cite

Effects of ash deposition on a transonic turbine guide vane are studied numerically. By incorporating the critical velocity sticking model in the commercial fluid dynamics software-FLUENT, the two-dimensionnal, steady Reynolds-Averaged Navier-Stokes(RANS) equations are solved for the clean vane and then the ash deposition rate on the turbine guide vane surface is acquired. Then the turbine vane pressure surface is set roughness based on the ash deposition rate. Two roughness setting strategies are adopted. One of them is setting average roughness and the other is setting variable roughness according to the fitting curve of the ash deposition rate. Lastly, the flow field of the guide vane with different roughness is calculated to investigate the effects of ash depositon on the aerodynamic performance of the turbine vane. The differences of results caused by the above two roughness setting strategies are also discussed.The distribution of deposition rate on the vane surface indicates that ash particles are mostly deposited on the blade pressure surface and that deposition rate has a drastic fluctuation, which may cause rapidly increasing roughness on the blade surface. By comparing the blade flow field with different blade surface roughness, it is found that surface roughness has little effects on the mach ditribution along the blade surface but increases the blade surface friction and the total pressure loss observably. Furthermore, results show that the variable roughness on the blade pressure surface has smaller effects on the blade aerodynamic performance than those caused by uniform roughness.

show abstract

Coating Effect on Particle Trajectories and Turbine Blade Erosion

Cited by 15 publications

References 0 publications

Effects of Sand Ingestion on the Blockage of Film-Cooling Holes

Effects of Sand Ingestion on the Blockage of Film-Cooling Holes

Experimental and Numerical Study of Single and Multiple Impacts of Angular Particles on Ductile Metals

The Effect of Ash Deposition on a Transonic Turbine Guide Vane

Contact Info

Product

Resources

About