Evaluation of Spray and Combustion Behavior of Alternative Fuels for JP-8

Mondragon, Ulises; Brown, Christopher T.; McDonell, Vincent

doi:10.2514/6.2012-348

Cited by 3 publications

(2 citation statements)

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“…Such large ranges are not common for liquid fuels and may not provide the full picture, as the fit of the findings over a large range of conditions may overlook smaller influences. For example, Mondragon et al 16 demonstrated that for fuels with similar viscosities (within 10%), the maximum penetration in the gaseous crossflow can change by as much as 10%, which is considerably greater than what would be expected from the correlations. Although a definitive correlation with the liquid viscosity was not possible in their study, various effects were proposed as possible influences, including the liquid properties, atomization, and the column break mode.…”

Section: Introductionmentioning

confidence: 86%

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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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Section: Introductionmentioning

confidence: 86%

“…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%