Experimental investigation of the kinematics of post-impact ice fragments

Guégan, Pierrick; Othman, Ramzi; Lebreton, Daniel; Pasco, Franck; Villedieu, Philippe; Meyssonnier, Jacques; Wintenberger, Sylvie

doi:10.1016/j.ijimpeng.2011.05.003

Cited by 46 publications

(14 citation statements)

References 27 publications

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“…Studies by Guégan et al 5,6 and Pan and Render 7-13 on the impact of hail-size ice particles showed very high velocities for the first ejected fragments during impact. The velocity of those first ejected fragments was higher than the approaching ice particle velocity before impact.…”

Section: B Fragment Cloud Edge Velocitymentioning

confidence: 92%

“…One of the important observations of Guégan et al and Pan and Render when studying impact of hailstones was the very shallow angle at which the particle fragments move in a direction perpendicular to the impact surface 5,6,17 . Angles of less than 2 o were observed.…”

Section: Additional General Observationsmentioning

confidence: 99%

“…Excellent studies were conducted at the time by industry and academia on the impact characteristics and numerical models were implemented [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] . Because of the differences in size between hailstones and ice crystals, it is not clear if the hailstone results can be directly applied to ice crystal impacts on engine surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Ice Particle Impacts on a Moving Wedge

Vargas

Struk

Kreeger

et al. 2014

6th AIAA Atmospheric and Space Environments Conference

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This work presents the results of an experimental study of ice particle impacts on a moving wedge. The experiment was conducted in the Adverse Environment Rotor Test Stand (AERTS) facility located at Penn State University. The wedge was placed at the tip of a rotating blade. Ice particles shot from a pressure gun intercepted the moving wedge and impacted it at a location along its circular path. The upward velocity of the ice particles varied from 7 to 12 meters per second. Wedge velocities were varied from 0 to 120 meters per second. Wedge angles tested were 0⁰, 30⁰, 45⁰, and 60⁰. High speed imaging combined with backlighting captured the impact allowing observation of the effect of velocity and wedge angle on the impact and the post-impact fragment behavior. It was found that the pressure gun and the rotating wedge could be synchronized to consistently obtain ice particle impacts on the target wedge. It was observed that the number of fragments increase with the normal component of the impact velocity. Particle fragments ejected immediately after impact showed velocities higher than the impact velocity. The results followed the major qualitative features observed by other researchers for hailstone impacts, even though the reduced scale size of the particles used in the present experiment as compared to hailstones was 4:1. Nomenclature ϕ = Time delay between the triggering of the pressure gun and the appearance of the frozen droplets at the desired height τ = Time delay between a triggering signal and the appearance of the rotor tip in the field of view α = Wedge angle AERTS = Adverse Environment Rotor Test Stand APL = John Hopkins University Applied Physics Laboratory D = Droplet diameter FAA = Federal Aviation Administration L= Distance from outer face of ice particle to wedge surface n-p = Frame of reference along the surface of the wedge, used for velocity calculations. s = Distance from (x c , y c ) to the point of impact t = Time it takes the particle starting at (x f ,y f ) to impact the wedge u = Horizontal velocity of the ice particle with respect to the x-y frame of reference v = Vertical velocity of the ice particle with respect to the x-y frame of reference V n = Velocity of the ice particle normal to the wedge surface Downloaded by UNIVERSITY OF ILLINOIS on October 1, 2015 | http://arc.aiaa.org |

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Section: B Fragment Cloud Edge Velocitymentioning

confidence: 92%

Section: Additional General Observationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ice Particle Impacts on a Moving Wedge

Vargas

Struk

Kreeger

et al. 2014

6th AIAA Atmospheric and Space Environments Conference

View full text Add to dashboard Cite

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“…In the inelastic regime the restitution coefficient decreased with increasing impact velocity and with increasing particle size. Guégan et al [47,48] • ) were tested for a range of velocities between 60 and 200 m/s. The experiments have shown that the post-impact particles are emitted in a circular cloud.…”

Section: Impact Physicsmentioning

confidence: 99%

Eulerian method for ice crystal icing in turbofan engines

Norde¹

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“…Guégan et al 11 , performed ice impact visualization of 6 mm diameter frozen drops, while the tests described in this paper focus on the upper median diameter range of ice crystals encountered by engines operating under ice crystal environments (400 to 950 µm). Guégan studied the dynamics of the post-impact fragment cloud.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurement of Frozen and Partially Melted Water Droplet Impact Dynamics

Palacios¹,

Yan

Tan

et al. 2014

6th AIAA Atmospheric and Space Environments Conference

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High-speed video of single frozen water droplets impacting a surface was acquired. The frozen particles had a diameter ranging from 0.4 mm to 0.9 mm and impacted at velocities varying from 140 m/sec to 309 m/sec. The technique used to freeze the droplets and launch the particles against a surface is described in this paper. High-speed video was used to quantify the ice accretion area to the surface for varying impact angles (30⁰, 45⁰, 60⁰), and impacting velocities. An oxygen /acetylene cross-flow flame used to partially melt the traveling frozen particles is also discussed. A linear relationship between impact angle and ice accretion is identified for fully frozen particles. The slope of the relationship is affected by impact speed. Higher impact angles closer to perpendicularity between the surface and the particle trajectory, e.g. 60⁰, exhibited small differences in ice accretion with varying velocities. Increasing velocity from 161 m/sec to 259 m/sec nearly doubled the ice accretion area at a shallower impact angle of 30⁰. The increase accretion area highlights the importance of impact angle and velocity on the accretion process of partially melted ice crystals. It was experimentally observed that partial melting was not a pre-requisite for accretion at the tested velocities when impact angles of 45⁰ and 30⁰ were used. Partially melted droplets using just 0.0023 Joules of energy also doubled the ice accretion area. The partially melted state of the particles and a method to quantify the percentage increase in the ice accretion area is also described in the paper.

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Experimental investigation of the kinematics of post-impact ice fragments

Cited by 46 publications

References 27 publications

Ice Particle Impacts on a Moving Wedge

Ice Particle Impacts on a Moving Wedge

Eulerian method for ice crystal icing in turbofan engines

Experimental Measurement of Frozen and Partially Melted Water Droplet Impact Dynamics

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