Response of Liquid Jet to Modulated Crossflow

Song, Jiyun; Ramasubramanian, Chandrasekar; Lee, Jong Guen

doi:10.1615/atomizspr.2013008071

Cited by 9 publications

(7 citation statements)

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“…Turbulence of liquid fuel in test condition affected the spray breakup a little as shown in previous research [28]. The liquids filled a vessel pressurized by nitrogen having first been prefiltered through a 15 /tm filter to avoid pressure drop in flow delivery to the test section.…”

Section: Methodsmentioning

confidence: 71%

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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Section: Methodsmentioning

confidence: 71%

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 orifice of the injector has an inner diameter of D 0 = 0.48 mm and a length of L 0 = 2 mm, resulting to a ratio L 0 /D 0 of about 4, through which the liquid fuel is injected. Plain orifice nozzles with similar length to diameter ratios are commonly used for liquid jets injected in gaseous crossflow atomisers, 14,[21][22][23][24] since this length is sufficient for the effect of the vena contracta to subside and for the liquid flow to realign with the nozzle axis before the liquid jet exits the nozzle. 25 The surfaces of the nozzle before and after the orifice are flat.…”

Section: Experimental Facilitymentioning

confidence: 99%

“…This range of velocities is within the range of velocities of interest to research in liquid jet atomisation in air crossflow. 14,16,22,27 The development of the liquid jet is described by 3 non-dimensional parameters. These are the Reynolds number, the Weber number, and the discharge coefficient.…”

Section: Experimental Facilitymentioning

confidence: 99%

How do liquid fuel physical properties affect liquid jet development in atomisers?

Charalampous

Hardalupas

2016

Physics of Fluids

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The influence of liquid fuel properties on atomisation remains an open question. The droplet sizes in sprays from atomisers operated with different fuels may be modified despite the small changes of the liquid properties. This paper examines experimentally the development of a liquid jet injected from a plain orifice in order to evaluate changes in its behaviour due to modifications of the liquid properties, which may influence the final atomisation characteristics. Two aviation kerosenes with similar, but not identical physical properties are considered, namely standard JP8 kerosene as the reference fuel and bio-derived Hydro-processed Renewable Jet (HRJ) fuel as an alternative biofuel. The corresponding density, dynamic viscosity, kinematic viscosity and surface tension change by about +5%, -5%, -10% and +5% respectively, which are typical for ‘drop-in’ fuel substitution. Three aspects of the liquid jet behaviour are experimentally considered. The pressure losses of the liquid jet through the nozzle are examined in terms of the discharge coefficient for different flowrates. The morphology of the liquid jet is visualised using high magnification Laser Induced Fluorescence (LIF) imaging. Finally, the temporal development of the liquid jet interfacial velocity as a function of distance from the nozzle exit is measured from time-dependent motion analysis of dual-frame LIF imaging measurements of the jet. The results show that for the small changes in the physical properties between the considered liquid fuels, the direct substitution of fuel did not result in a drastic change of the external morphology of the fuel jets. However, the small changes in the physical properties modify the interfacial velocities of the liquid and consequently the internal jet velocity profile. These changes can modify the interaction of the liquid jet with the surroundings, including air flows in coaxial or cross flow atomisation, and influence the atomisation characteristics during changes of liquid fuels

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“…The position of the jet orifice to the acoustic velocity nodes influences directly the jet destabilization, up to the jet atomization. Song et al [9] studied the effect of a modulated crossflow on the spray formed by the liquid jet injection. They found out that an oscillating gaseous crossflow faintly changes the trajectory of the jet whereas it affects its atomization, resulting in smaller and more numerous droplets than in the steady case.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale Eulerian-Lagrangian simulation of a liquid jet in cross-flow under acoustic perturbations

Thuillet¹,

Zuzio²,

Rouzaud³

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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The design of modern aeronautical propulsion systems is constantly optimized to reduce pollutant emissions while increasing fuel combustion efficiency. In order to get a proper mixing of fuel and air, Liquid Jets Injected in gaseous Crossflows (LJICF) are found in numerous injection devices. However, should combustion instabilities appear in the combustion chamber, the response of the liquid jet and its primary atomization is still largely unknown. Coupling between an unstable combustion and the fuel injection process has not been well understood and can result from multiple basic interactions. The aim of this work is to predict by numerical simulation the effect of an acoustic perturbation of the shearing air flow on the primary breakup of a liquid jet. Being the DNS approach too expensive for the simulation of complex injector geometries, this paper proposes a numerical simulation of a LJICF based on a multiscale approach which can be easily integrated in industrial LES of combustion chambers. This approach results in coupling of two models: a two-fluid model, based on the Navier-Stokes equations for compressible fluids, able to capture the largest scales of the jet atomization and the breakup process of the liquid column; and a dispersed phase approach, used for describing the cloud of droplets created by the atomization of the liquid jet. The coupling of these two approaches is provided by an atomization and re-impact models, which ensure liquid transfer between the two-fluid model and the spray model. The resulting numerical method is meant to capture the main jet body characteristics, the generation of the liquid spray and the formation of a liquid film whenever the spray impacts a solid wall. Three main features of the LJICF can be used to describe, in a steady state flow as well as under the effect of the acoustic perturbation, the jet atomization behavior: the jet trajectory, the jet breakup length and droplets size and distribution. The steady state simulations provide good agreement with ONERA experiments conducted under the same conditions, characterized by a high Weber number (We>150). The multiscale computation gives the good trajectory of the liquid column and a good estimation of the column breakup location, for different liquid to air momentum flux ratios. The analysis of the droplet distribution in space is currently undergoing. A preliminary unsteady simulation was able to capture the oscillation of the jet trajectory, and the unsteady droplets generation responding to the acoustic perturbation. Keywords multiscale numerical simulation, liquid jet in gaseous crossflow, acoustic perturbation, Euler-Lagrange coupling IntroductionThe liquid jet in crossflow (LJICF) configuration covers several applications in engineering systems, such as combustion, chemical or even agriculture fields. Particularly in aircraft combustion chambers, systems where the fuel jet is injected normally into an air crossflow are commonly used. Compared with a free jet into a quiescent flow, this configuration enab...

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Response of Liquid Jet to Modulated Crossflow

Cited by 9 publications

References 0 publications

Liquid Jets in Subsonic Air Crossflow at Elevated Pressure

Liquid Jets in Subsonic Air Crossflow at Elevated Pressure

How do liquid fuel physical properties affect liquid jet development in atomisers?

Multi-scale Eulerian-Lagrangian simulation of a liquid jet in cross-flow under acoustic perturbations

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