Effect of Temperature on Microparticle Rebound Characteristics at Constant Impact Velocity

Delimont, Jacob; Murdock, M. K.; Ng, W. F.; Ekkad, Srinath V.

doi:10.1115/gt2014-25687

Cited by 3 publications

(2 citation statements)

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“…This study provides further insight into particle deposition as a function of temperature and impact angle and will help narrow the gap. The companion works for this study [12,18] investigate the effects of temperature and impact angle at lower temperatures. The results from these studies provide insight into particle deposition at near melting temperatures and could be used for validation purposes.…”

Section: Past Studiesmentioning

confidence: 99%

“…Figures 14 and 15 show particle deposition at temperatures ranging from 950°C to 1100°C at 30° and 50° coupon angle. Deposition at 950°C, 1000°C, and 1050°C were performed by Delimont et al [12,18] and are used for comparison. As seen in Figure 14, particle deposition increases drastically with increase in temperature for 50° coupon angle.…”

Section: Effect Of Temperature On Particle Deposition At Constant Coumentioning

confidence: 99%

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Preliminary Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines

Boulanger

Patel

Hutchinson

et al. 2016

Volume 1: Aircraft Engine; Fans and Blowers; Marine

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Particle ingestion into modern gas turbine engines is known to reduce performance and may damage many primary gas path components through erosion or deposition mechanisms. Many studies have been conducted that evaluate the effects of particulate ingestion in primary and secondary gas path components. However, modern gas turbines have gas path temperatures that are above most previous studies. As a result, this study performed particle deposition experiments at the Virginia Tech Aerothermal Rig facility at engine representative temperatures. Arizona Test Dust of 20 to 40 μm was chosen to represent the particle ingested into rotorcraft turbine engines in desert and sandy environments. The experimental setup impinged air and sand particles on a flat Hastelloy X coupon. The gas and sand mixture impacted the coupon at varying angles measured between the gas flow direction and coupon face, hereby referred to as coupon angle. For this study, gas and sand particles maintained a constant flow velocity of about 70 m/s and a temperature of about 1100°C. The coupon angle was varied between 30° to 90° for all experiments. The experimental results indicate sand deposition increased linearly from about 975 °C to 1075 °C for all coupon angles. A multiple linear regression model is used to estimate the amount of deposition that will occur on the test coupon as a function of gas path temperature and coupon angle. The model is adequate in explaining about 67% of the deposition that occurs for the tests. The remaining percentage could be explained with other factors such as particle injection rates and exact surface temperature where the deposits occur.

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Section: Past Studiesmentioning

confidence: 99%

Section: Effect Of Temperature On Particle Deposition At Constant Coumentioning

confidence: 99%

Preliminary Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines

Boulanger

Patel

Hutchinson

et al. 2016

Volume 1: Aircraft Engine; Fans and Blowers; Marine

View full text Add to dashboard Cite

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Effect of Temperature on Microparticle Rebound Characteristics at Constant Impact Velocity—Part II

Delimont

Murdock

et al. 2015

Journal of Engineering for Gas Turbines and Power

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When gas turbine engines operate in environments where the intake air has some concentration of particles, the engine will experience degradation. Very few studies of such microparticles approaching their melting temperatures are available in open literature. The coefficient of restitution (COR), a measure of the particles' impact characteristics, was measured in this study of microparticles using a particle tracking technique. Part II of this study presents data taken using the Virginia Tech Aerothermal Rig and Arizona road dust (ARD) of 20–40 μm size range. Data were taken at temperatures up to and including 1323 K, where significant deposition of the sand particles was observed. The velocity at which the particles impact the surface was held at a constant 70 m/s for all of the temperature cases. The target on which the particles impacted was made of a nickel alloy, Hastelloy X. The particle angle of impact was also varied between 30 deg and 80 deg. Deposition of particles was observed as some particles approach their glass transition point and became molten. Other particles, which do not become molten due to different particle composition, rebounded and maintained a relatively high COR. Images were taken using a microscope to examine the particle deposition that occurs at various angles. A rebound ratio was formulated to give a measure of the number of particles which deposited on the surface. The results show an increase in deposition as the temperature approaches the melting temperature of sand.

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A Simple Physics-Based Model for Particle Rebound and Deposition in Turbomachinery

Bons

Prenter

Whitaker

2017

Journal of Turbomachinery

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A new model is proposed for predicting particle rebound and deposition in environments relevant to gas turbine engines. The model includes the following physical phenomena: elastic deformation, plastic deformation, adhesion, and shear removal. It also incorporates material property sensitivity to temperature and tangential-normal rebound velocity cross-dependencies observed in experiments. The model is well-suited for incorporation in computational fluid dynamics (CFD) simulations of complex gas turbine flows due to its algebraic (explicit) formulation. Model predictions are compared to coefficient of restitution data available in the open literature as well as deposition results from two different high-temperature turbine deposition facilities. While the model comparisons with experiments are in many cases promising, several key aspects of particle deposition remain elusive. The simple phenomenological nature of the model allows for parametric dependencies to be evaluated in a straightforward manner. It is hoped that this feature of the model will aid in identifying and resolving the remaining stubborn holdouts that prevent a universal model for particle deposition.

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Effect of Temperature on Microparticle Rebound Characteristics at Constant Impact Velocity

Cited by 3 publications

References 0 publications

Preliminary Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines

Preliminary Experimental Investigation of Initial Onset of Sand Deposition in the Turbine Section of Gas Turbines

Effect of Temperature on Microparticle Rebound Characteristics at Constant Impact Velocity—Part II

A Simple Physics-Based Model for Particle Rebound and Deposition in Turbomachinery

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