Structure of Liquid Jets in Subsonic Crossflow at Elevated Ambient Pressures

Elshamy, Omar; Tambe, Samir B.; Jeng, San‐Mou

doi:10.2514/6.2006-1224

Cited by 17 publications

(21 citation statements)

References 16 publications

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“…It is observed that increasing the air stream temperature or the liquid jet temperature results in the decrease of the liquid jet penetration [183]. Furthermore, it is noticed that at a given q, an increase in the ambient pressure increases the breakup and decreases the liquid jet penetration [184,185].…”

Section: Liquid Jet In Crossflowmentioning

confidence: 99%

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A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

2015

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Abstract:In thermal spraying processes, molten, semi-molten, or solid particles, which are sufficiently fast in a stream of gas, are deposited on a substrate. These particles can plastically deform while impacting on the substrate, which results in the formation of well-adhered and dense coatings. Clearly, particles in flight conditions, such as velocity, trajectory, temperature, and melting state, have enormous influence on the coating properties and should be well understood to control and improve the coating quality. The focus of this study is on the high velocity oxygen fuel (HVOF) spraying and high velocity suspension flame spraying (HVSFS) techniques, which are widely used in academia and industry to generate different types of coatings. Extensive numerical and experimental studies were carried out and are still in progress to estimate the particle in-flight behavior in thermal spray processes. In this review paper, the fundamental phenomena involved in the mentioned thermal spray techniques, such as shock diamonds, combustion, primary atomization, secondary atomization, etc., are discussed comprehensively. In addition, the basic aspects and emerging trends in simulation of thermal spray processes are reviewed. The numerical approaches such as Eulerian-Lagrangian and volume of fluid along with their advantages and disadvantages are explained in detail. Furthermore, this article provides a detailed review on simulation studies published to date. OPEN ACCESSCoatings 2015, 5 577

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Section: Liquid Jet In Crossflowmentioning

confidence: 99%

“…where T0 = 294 K. A correlation including the gas pressure effect was offered as below [184] 4.95 0.5…”

Section: Liquid Jet In Crossflowmentioning

confidence: 99%

A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

2015

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“…Ingebo [14], Tambe et al [2], Wu et al [18], Elshamy and Jeng [3,5] and others have reported results correlating to the tra jectories of upper spray boundaries. Ingebo [14], Tambe et al [2], Wu et al [18], Elshamy and Jeng [3,5] and others have reported results correlating to the tra jectories of upper spray boundaries.…”

Section: Introductionmentioning

confidence: 98%

“…For the purposes of this paper, this research can be subdivided into breakup regime [1][2][3][4][5][6][7][8][9][10][11], mean droplet size and distribution [1][2][3][4][5][12][13][14][15][16][17][18][19], and spray penetration [1][2][3][4][5][6]11,12,[20][21][22][23][24]. Applications are numerous including industrial and agricultural sprays but lend particularly well to avi ation engines including ramjets, scramjets, turbojet augmenters, and liquid rockets.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental research has been undertaken by Becker and [3,5,26], Rachneret al [4], Amighi et al [6], Ragucei et al [13], and Herrmann et al [27] with results dem onstrating that elevated pressure leads to decreases for penetra tion, spray spread, and axial distance for droplets to follow the airflow. Experimental research has been undertaken by Becker and [3,5,26], Rachneret al [4], Amighi et al [6], Ragucei et al [13], and Herrmann et al [27] with results dem onstrating that elevated pressure leads to decreases for penetra tion, spray spread, and axial distance for droplets to follow the airflow.…”

Section: Introductionmentioning

confidence: 99%

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Liquid Jets in Subsonic Air Crossflow at Elevated Pressure

Song

Cain

Lee

2014

Journal of Engineering for Gas Turbines and Power

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The breakup, penetration, droplet size, and size distribution of a Jet A-l fuel in air crossflow has been investigated with focus given to the impact of surrounding air pressure. Data have been collected by particle Doppler phased analyzer (PDPA), Mie-scattering with high speed photography augmented by laser sheet, and Mie-scattering with intensified chargecoupled device (ICCD) camera augmented by nanopulse lamp. Nozzle orifice diameter, d," was 0.508 mm and nozzle orifice length to diameter ratio, l,Jd0, was 5.5. Air crossflow velocities ranged from 29.57 to 137.15 mis, air pressures from 2.07 to 9.65 bar, and temper ature held constant at 294.26 K. Fuel flow provides a range offuellair momentum flux ratio (q) from 5 to 25 and Weber number from 250 to 1000. From the results, adjusted correlation of the mean drop size has been proposed using drop size data measured by PDPA as follows: (Do/Di2) = 0.267We"Mqom(pl/p a)OM(pi/pay° >b. This correlation agrees well and shows roles of aerodynamic Weber number, Wea, momentum flux ratio, q, and density ratio, ptlpa. Change of the breakup regime map with respect to surrounding air pressure has been obsen ed and revealed that the boundary betw een each breakup modes can be predicted by a transformed correlation obtained from above correlation. In addi tion, the spray trajectory for the maximum Mie-scattering intensity at each axial location downstream of injector is extracted from averaged Mie-scattering images. From these results, correlations with the relevant parameters including q, xld," density ratio, viscosity ratio, and Weber number are made over a range of conditions. According to spray trajec tory at the maximum Mie-scattering intensity, the effect of surrounding air pressure becomes more important in the farfield. On the other hand, effect of aerodynamic Weber number is more important in the neaifield.

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Injector Design Guidelines

Ingenito

2021

Subsonic Combustion Ramjet Design

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Structure of Liquid Jets in Subsonic Crossflow at Elevated Ambient Pressures

Cited by 17 publications

References 16 publications

A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

A Comprehensive Review on Fluid Dynamics and Transport of Suspension/Liquid Droplets and Particles in High-Velocity Oxygen-Fuel (HVOF) Thermal Spray

Liquid Jets in Subsonic Air Crossflow at Elevated Pressure

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