Modeling Atomization Processes of Pressure-Swirl Hollow-Cone Fuel Sprays

Han, Zhiyu; Parrish, Scott; Farrell, Patrick V.; Reitz, Rolf D.

doi:10.1615/atomizspr.v7.i6.70

Cited by 179 publications

(92 citation statements)

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“…The injection velocity (U) is dependent on the pressure difference (Δp) between the injection (p inj ) and chamber pressure (p c ): (1) In the original linear instability sheet atomization (LISA) breakup model for pressure-swirl injectors, a velocity coefficient (k v ) is used instead of discharge coefficient (C D ) in Eq. (1), and a correlation for the coefficient has been suggested [36]. Later, Schmidt et al [37] estimated the velocity coefficient from a typical value (0.78) of the discharge coefficient of a single nozzle with sharp inlet corners by reducing the value by 10% for extra momentum losses, such that (2) where θ is the half of spray angle and d n is the nozzle diameter.…”

Section: Numerical Setupmentioning

confidence: 99%

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Badra

Elwardany

Sim

et al. 2016

SAE Technical Paper Series

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Gasoline compression ignition (GCI) engines have been considered an attractive alternative to traditional spark ignition engines. Low octane gasoline fuel has been identified as a viable option for the GCI engine applications due to its longer ignition delay characteristics compared to diesel and in the volatility range of gasoline fuels. In this study, we have investigated the effect of different injection timings at part-load conditions using light naphtha stream in single cylinder engine experiments in the GCI combustion mode with injection pressure of 130 bar. A toluene primary reference fuel (TPRF) was used as a surrogate for the light naphtha in the engine simulations performed here. A physical surrogate based on the evaporation characteristics of the light naphtha has been developed and its properties have been implemented in the engine simulations. Full cycle GCI computational fluid dynamics (CFD) engine simulations have been successfully performed while changing the start of injection (SOI) timing from -50° to -11 ° CAD aTDC. The effect of SOI on mixing and combustion phasing was investigated using detailed equivalence ratio-temperature maps and ignition delay times. Both experimental and computational results consistently showed that an SOI of -30° CAD aTDC has the most advanced combustion phasing (CA50), with the highest NOx emission. The effects of the SOI on the fuel containment in the bowl of the piston, the ignition delay time, combustion rate and emissions have been carefully examined through the CFD calculations. It was found that the competition between the equivalence ratio and temperature is the controlling parameter in determining the combustion phasings.

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Section: Numerical Setupmentioning

confidence: 99%

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Badra

Elwardany

Sim

et al. 2016

SAE Technical Paper Series

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“…5 2 2 cos ρ σ θ Figure 6. Schematic showing the conceptual liquid flow structure at the nozzle exit and sheet breakup processes [12].…”

Section: Breakup Lengthmentioning

confidence: 99%

Effect of Arene and Naphthene Concentration on Spray Characteristics of Biomass Jet Fuel

Zhou¹,

Fang²,

Zhou³

2018

dtetr

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Abstract. Arene and naphthene are pyrolytic products in the preparation of biomass fuels and the main ingredient of jet fuel China RP-3. Biomass fuel has the advantages of reducing greenhouse gas emission and reducing fuel cost, it is necessary to develop the research and application of biomass fuel. This work investigate the influence of arene and naphthene concentration on the spray characteristics of jet fuel China RP-3 using a hollow cone pressure swirl nozzle The cone angles and sheet breakup length were measured at injection pressure of 0.3,0.5,0.7 and 0.9MPa using shadowgraph system. In the same injection pressure, to add up ethylbenzene concentration will bring down the cone angle and increase the breakup length and to add up ethylcyclohexane concentration will increase the cone angle and bring down the breakup length. For both of ethylbenzene and ethylcyclohexane the effect of concentration on cone angle is no more than 8% and on breakup length is no more 16%. While the influence of injection pressure could reach up to 15% and 67% for cone angle and breakup length.

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“…The atomization process of a liquid fuel jet [14][15][16][17][18], the turbulent dispersion of the resulting droplets [19][20][21][22][23], their interaction with walls [24,25], their evaporation and combustion [26] are phenomena occuring for LES at the subgrid scale and therefore requiring accurate modelling.…”

Section: However Most Les Calculations Consider Only Gaseous Flows Anmentioning

confidence: 99%

Investigation of Two-Fluid Methods for Large Eddy Simulation of Spray Combustion in Gas Turbines

Boileau

Pascaud

Riber

et al. 2007

Flow Turbulence Combust

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An extension of the Large Eddy Simulation (LES) technique to two-phase reacting flows, required to capture and predict the behavior of industrial burners, is presented.While most efforts reported in the literature to construct LES solvers for two-phase flow focus on Euler-Lagrange formulation, the present work explores a different solution ('two-fluid' approach) where an Eulerian formulation is used for the liquid phase and coupled with the LES solver of the gas phase. The equations used for each phase and the coupling terms are presented before describing validation in two simple cases which gather some of the specificities of real combustion chamber: (1) a one-dimensional laminar JP10/air flame and (2) a non-reacting swirled flow where solid particles disperse [1]. After these validations, the LES tool is applied to a realistic aircraft combustion chamber to study both a steady flame regime and an ignition sequence by a spark. Results bring new insights into the physics of these complex flames and demonstrate the capabilities of two-fluid LES.

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Modeling Atomization Processes of Pressure-Swirl Hollow-Cone Fuel Sprays

Cited by 179 publications

References 0 publications

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Effect of Arene and Naphthene Concentration on Spray Characteristics of Biomass Jet Fuel

Investigation of Two-Fluid Methods for Large Eddy Simulation of Spray Combustion in Gas Turbines

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