Transient burning of a convective fuel droplet

Wu, Guanglu; Sirignano, William A.

doi:10.1016/j.combustflame.2009.11.019

Cited by 23 publications

(5 citation statements)

References 13 publications

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“…The numerical setup for this study includes a single deformable droplet of diameter d 0 = 100 µm evaporating in a hot and pressurized incoming flow at at P ∞ = 20 atm [30] and T ∞ = 750 K. These conditions were selected to mimic environment of a gas turbine combustor. As a simplification, the liquid droplet is at its boiling temperature T Γ = 615 K. Hence, the internal heating of the droplet is not considered.…”

Section: Numerical Setupmentioning

confidence: 99%

Evaporation of deformable liquid fuel droplets

Setiya¹,

Palmore²

2022

Preprint

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This work covers the effect of droplet deformation on its evaporation rate under convective flow conditions. A single component jet fuel surrogate n-decane is used as a liquid fuel. The large droplets in sprays tend to deform due to an imbalance of aerodynamic force and surface tension, hence deviate from a spherical shape. This influence of the deformation and planar flow on evaporation is investigated by varying the relevant non-dimensional groups such as Weber number (W e) ranging from 1 − 12 and Reynolds number (Re) ranging from 25 to 120. These numerical studies utilize a numerical framework for interface capturing Direct Numerical Simulation (DNS) for multiphase flows. The framework is built upon an in-house code NGA. A grid-independent study is performed in order to find an accurate and computationally feasible grid for this work.Furthermore, the numerical results are compared against the analytical correlations by Abramzon and Sirignano (Int. Journal of heat and mass transfer, 1989) to validate the accuracy of the solver.The results for grid size N d = 24 are found to be in good agreement with the analytical solution with 5% of difference.Finally, the effect of droplet shape on the evaporation rate at various Re is quantified in terms of total evaporation rate and its contributors: local evaporation rate and the total surface area.Results suggest that the evaporation of the droplet has a weak dependency with Weber number at low Re. However, as the deformation is significant for W e = 4, 8, 12 at Re = 120, it plays a key role in altering the total evaporation rate ( ṁ) by altering the flow around it.

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Section: Numerical Setupmentioning

confidence: 99%

Evaporation of deformable liquid fuel droplets

Setiya¹,

Palmore²

2022

Preprint

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“…For multi-droplet cases, the interactions amongst droplets would decrease the droplet vaporization rate if the spacing amongst droplets is not large enough (e.g. <8 ) [17][18][19][20][21][22][23][24]. Imaoka and Sirignano [17,18] proposed a correction factor to take account of the interaction effect.…”

Section: Consideration Of Droplet Interactionsmentioning

confidence: 99%

CED Efficient Models of droplet Heating and Vaporization

Journal

2013

PDJ

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There exist a large number of models of droplet heating and vaporization rates with different complexities and computational costs. This paper reviews briefly those which are currently or have a good potential to be used for efficient CFD (computational fluid dynamics) simulation, e.g. commercial CFD packages such as Fluent. All the models discussed in this paper are simple and CFD efficient, i.e., incorporation of them would not add substantial computational cost. However, many assumptions (e.g. infinite thermal conductivity in the droplet) are made for these models, and the models may have limited accuracy if the assumptions made are not satisfied.

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“…Indeed, engineering power generation combustion systems operate at elevated ambient pressure and temperature conditions coupled with forced convective (laminar or/and turbulent) flow. The effect of forced flow/convection on hydrocarbon droplet combustion has been studied quite extensively under laminar flow conditions and therefore there is a wealth of knowledge (see, e.g., recent references [1][2][3][4][5][6][7][8][9][10], and references cited therein, M. Birouk ( ) · S. L. Toth Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada e-mail: madjid.birouk@umanitoba.ca to cite only a few). However, studies reporting on the effect of a turbulent or an acoustic field are quite limited (e.g., [11][12][13][14][15][16][17]).…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon Droplet Turbulent Combustion in an Elevated Pressure Environment

Birouk

Toth

2015

Flow Turbulence Combust

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New experimental data on the effect of turbulence on the combustion of nheptane and n-decane droplet at elevated pressure are reported. Turbulent flow field in the central volume of a spherical vessel was generated by a set of eight axial fans. Flow characterization demonstrated that turbulence is isotropic and homogeneous within the 40 mm central volume of the vessel. The combustion of n-heptane and n-decane droplet was examined by varying turbulence intensity via the fans rotational speed and ambient pressure and temperature inside the vessel/chamber. Results showed that droplet burning rate becomes sensitive to turbulence only at elevated ambient pressure. Droplet flame extinction was found to depend on the heat loss from the droplet envelop flame, which increases with turbulence intensity.

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Transient burning of a convective fuel droplet

Cited by 23 publications

References 13 publications

Evaporation of deformable liquid fuel droplets

Evaporation of deformable liquid fuel droplets

CED Efficient Models of droplet Heating and Vaporization

Hydrocarbon Droplet Turbulent Combustion in an Elevated Pressure Environment

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