Comparison of CFD Predictions and Experimental Measurements of Liquid Jet Injection into a Vitiated Crossflow

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

doi:10.2514/6.2012-4327

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…However, current modeling tools demonstrate limitations when it comes to accurate predictions of liquid fueled systems. For example, blind predictions of basic phenomena such as liquid jet penetration or liquid fuel plume dispersion rates have been shown to vary by as much as 53% using current state of the art CFD tools [1] This inaccuracy limits the ability of the engine designers to determine how fuel type might affect fuel placement as the first step to evaluating design modifications to improve robustness in operability. As a result, it is apparent that further improvements are needed in the modeling of fuel injection phenomena such as penetration, atomization, and dispersion in order to allow confidence in simulations to reach the level where design decisions can be made with confidence.…”

Section: Background and Objectivementioning

confidence: 97%

Characterization and Analysis of Plain Jet Injection of Liquid Alternative Fuels Into a Crossflow

Brown¹,

Mondragon²,

McDonell³

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

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A number of "drop-in" replacement fuels for JP-8 are currently under development to assure a secure source of fuel for aviation applications. In the present work, evaluation of a liquid jet injected into a crossflow is carried out. Characteristics such as spray 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. If confidence can be built in the use of design correlations, it can likely lead to simplification in the overall fuel assessment process when considering potential replacement fuels. The results show that some characteristics can be effectively captured (e.g., overall spray SMD) by simple models, whereas others cannot (e.g., spray penetration). This type of information can lead to the identification of areas of weakness relative to design tools that can be targeted for improvement though additional experimental studies and associated analyses. NomenclatureA = physical area d = diameter D32 = Sauter mean diameter Cd = discharge coefficient gc = gravitational constant p = pressure q = momentum flux ratio (defined in Eq. 2) Q = volume flow rate U = velocity  density  = liquid surface tension  = viscosity x,y,z = distance per sketch u,v,w = velocity component per sketch Subscripts g = gas l = liquid o = initial 1 = upstream 2 = downstream

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Section: Background and Objectivementioning

confidence: 97%

Characterization and Analysis of Plain Jet Injection of Liquid Alternative Fuels Into a Crossflow

Brown¹,

Mondragon²,

McDonell³

2014

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

Self Cite

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“…Furthermore, previous studies of such conditions, both experimental and computational, have focused almost exclusively on co-flow and free-jet configurations. Only two prior works have targeted SICF configurations specifically, namely, the experimental work of Miniero et al (2022) and the computational work of Brown et al (2012). The former analysed the effect of the prescribed air-to-liquid mass-flow ratio (ALR) of an airblast (or air-assisted) atomiser.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of a Reacting Kerosene Spray in Hot Vitiated Cross-Flow

Fredrich

Miniero

Pandey

et al. 2022

Flow Turbulence Combust

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The evaporation and combustion characteristics of a kerosene spray injected perpendicularly into a cross-flow of high-temperature vitiated air is investigated. This fundamental flow configuration has wider implications for the future development of ultra-low emission aeronautical combustors, particularly with respect to technologies involving MILD combustion. Large eddy simulations with a Eulerian–Lagrangian framework are performed to investigate the spray evolution and the characteristics of the reaction zone for a range of conditions. For the closure of turbulence-chemistry interactions at the sub-grid scales, a transported probability density function approach solved by the Eulerian stochastic fields method is applied. A configuration based on the use of airblast atomisation is assessed first and compared with experimental observations. The effect of the atomiser air-to-liquid mass flow ratio is studied in greater detail, both in terms of the resulting gas-phase properties and the droplet evaporation process. Then, the effect of ambient pressure on the global spray flame behaviour is examined. For this part of the study, no atomising air is included in the simulation to separate the effects of ambient pressure on the spray from the interaction with the air jet. Analysis of the flame and spray properties at cross-flow operating pressures of 1 atm, 2 bar and 4 bar highlights the strong coupling between the reacting flow and droplet evaporation characteristics, which are highly affected by the penetration of the spray into a flow field characterised by relatively large gradients of temperature. The results reported in this work provide fundamental understanding for the development of novel low-emission combustion technologies and demonstrate the feasibility of applying large eddy simulation with detailed chemistry for the investigation of reacting aviation fuel sprays in hot vitiated cross-flow.

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Comparison of CFD Predictions and Experimental Measurements of Liquid Jet Injection into a Vitiated Crossflow

Cited by 2 publications

References 12 publications

Characterization and Analysis of Plain Jet Injection of Liquid Alternative Fuels Into a Crossflow

Characterization and Analysis of Plain Jet Injection of Liquid Alternative Fuels Into a Crossflow

Large Eddy Simulation of a Reacting Kerosene Spray in Hot Vitiated Cross-Flow

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