Characterization of Liquid Jet Atomization across a High-Speed Airstream.

Oda, Tetsuya; Hiroyasu, Hiroyuki; Arai, Masataka; Nishida, Keiya

doi:10.1299/jsmeb.37.937

Cited by 18 publications

(13 citation statements)

References 4 publications

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“…, which is consistent with the great number of experimental studies devoted to jet atomisation in cross flow (Oda et al 1994;Inamura and Nagai 1997;Wu et al 1998). Such studies have been conducted for injectors of smaller size, many of which consider fuel jets and mixing of liquid propellants in the combustion process.…”

Section: Drop Pattern Sizesupporting

confidence: 76%

Air tanker drop patterns

Legendre

Becker²,

Alméras

et al. 2014

Int. J. Wildland Fire

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract. Ground patterns of liquid aerial drops for combating wildfires are considered. Based on a significant number of drop tests performed using different airplanes and helicopters, a simple model for the length, the width and the coverage distribution is presented. At first order both the length and the width of the drop pattern can be described using simple relations despite the significant difference between the conditions of the drop tests considered. These relations include factors that can be manipulated during aircraft and release system design, as well as during aerial firefighting operations. The liquid on the ground follows a Gaussian distribution that makes possible an original prediction of the maximum coverage level on the pattern centreline confirmed by the experiments. The difference between gravity systems and recent pressurised systems is also discussed. We show a clear difference between gravity systems and pressurised systems. The width is larger for pressurised systems, resulting in a smaller coverage for the same condition of drop.

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Section: Drop Pattern Sizesupporting

confidence: 76%

Air tanker drop patterns

Legendre

Becker²,

Alméras

et al. 2014

Int. J. Wildland Fire

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“…The spatial distribution of droplets in the latter view compares qualitatively with tomograms of jet cross-sections 24 in Figure 8b. In those pictures, most of the drops appear to be shed from the edges of the flattened jet.…”

Section: A Liquid Jet In Crossflowmentioning

confidence: 52%

Towards an Efficient, High-Fidelity Methodology for Liquid Jet Atomization Computations

Arienti

Soteriou

et al. 2010

48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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The aim of this work is to show how adaptive mesh refinement and Lagrangian tracking can be integrated to enable high-fidelity computations of jet atomization and dispersion for industrially relevant configurations. In its present form, the Coupled Level Set and Volume of Fluid (CLSVOF) method for multiphase flow calculations is embedded in a dynamic, block-structured Adaptive Mesh Refinement (AMR) data structure which maximizes grid density at the liquid-gas interface. With the treatment proposed here, small liquid structures formed by atomization can be removed from the Eulerian description, transformed into Lagrangian particles, and advected using, for instance, a simple spherical model. As a result, mesh refinement is not required in the dilute spray region and can be contained to a smaller portion of the computational domain with minimal loss of accuracy. Two validation studies of liquid jet atomization by crossflowing gas and by jet-on-jet impingement are presented to demonstrate this new approach.

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“…However, information on viscosity, density and surface tension (required for applying Equation (1) and (2)) at the conditions of interest (which may include heated fuel in practice) is not readily available. Using a "representative" value for physical properties of JP-8 is problematic in that the range of physical properties within specification can introduce significant variability into the values calculated by Equation 1-Equation 4. Because of this, these values were measured for JP-8 and the specific fuels studied to facilitate accurate analysis.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, a large body of research studying this problem can be found in the literature [e.g., 1,2,3,4,5,6,7,8,9,10,11,12,13]. In much of this previous work, emphasis has been placed on assessing behavior as a function of the crossflow conditions (e.g., velocity, density, etc.).…”

Section: A Previous Workmentioning

confidence: 99%

“…The phenomena associated with the behavior of a jet injected into a crossflow are summarized in Figure 1, with definitions of the terms provided in Equation 1-Equation 4. Given the role of fuel properties illustrated shown in Figure 1 and the expressions shown below, it might be anticipated that fuel properties can give rise to differences in the breakup, penetration, and dispersion of the fuel.…”

Section: B Jet In Crossflow Phenomenamentioning

confidence: 99%

See 1 more Smart Citation

Behavior of Alternative Fuels Injected as a Liquid Jet Into a Crossflow

Brown

Mondragon

McDonell

2013

51st AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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A number of replacement fuels for JP-8 are currently under development to assure a secure source of fuel for aviation applications. Examples include Fischer-Tropsch derived liquids from coal or gas, or hydroprocessed fuels derived from vegetable oil or animal fats. The present effort focuses on examining how various candidate fuels behave upon injection into a subsonic crossflow. Characteristics such as droplet size, velocity, and dispersion are measured for the different fuels. As a result, the role of fuel type in the behavior of the spray can be assessed. In addition, the extent to which existing correlations or other models can describe the impact of the liquid properties on these characteristics is evaluated. The results show that systematic variation in liquid penetration occurs along with differences in column breaktime and frequency of the breakpoint motion. On the other hand, general droplet sizes, velocities, and volume flux profiles, at least measured on a time averaged basis exhibit little differences. The results suggest momentum flux captures the majority of the behavior as long as actual local values for the parameters are used (e.g., actual liquid jet velocity)

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Characterization of Liquid Jet Atomization across a High-Speed Airstream.

Cited by 18 publications

References 4 publications

Air tanker drop patterns

Air tanker drop patterns

Towards an Efficient, High-Fidelity Methodology for Liquid Jet Atomization Computations

Behavior of Alternative Fuels Injected as a Liquid Jet Into a Crossflow

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