Computational and experimental study of liquid sheet emanating from simplex fuel nozzle

Jeng, San‐Mou; Jog, Milind A.; Benjamin, M.

doi:10.2514/6.1997-796

Cited by 11 publications

(20 citation statements)

References 6 publications

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“…13 Our numerical model was validated by comparing computational predictions and experimental measurements of the variations of lm thickness, spray cone angle, and discharge coef cient with atomizer constant,as well as the shape of the gas/liquid interface. 12 Excellent agreement between computational and experimental results was observed, thereby con rming that the ALE method can predict accurately the shape of the interface, lm thickness, cone angle, and dischargecoef cient. The effect of atomizer constant K on the ow in a simplex nozzle was investigated.…”

supporting

confidence: 64%

“…Recently, we have developed a computational model to track accurately the liquid/air interface and predict the ow in a simplex nozzle. 12 This was accomplishedby using the arbitrary-LagrangianEulerian (ALE) method. 13 Our numerical model was validated by comparing computational predictions and experimental measurements of the variations of lm thickness, spray cone angle, and discharge coef cient with atomizer constant,as well as the shape of the gas/liquid interface.…”

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confidence: 99%

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Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

et al. 2000

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A numerical study is presented of the effects of changes in simplex nozzle geometry on its performance. A computational model based on the arbitrary-Lagrangian-Eulerianmethod with an adaptive grid-generation scheme is used. Three nondimensional geometric parameters are studied: the length-to-diameter ratio of the swirl chamber L s /D s and ori ce l o /d o and the swirl-chamber-diameter-to-exit-ori ce-diameter ratio D s /d o . The variations in the atomizer performance, caused by the changes in the geometric parameters, are presented in terms of the lm thickness at the exit of the ori ce, the spray cone angle, and the discharge coef cient. Results indicate that these geometric parameters have a signi cant effect on the internal ow and performance of simplex nozzles. With a constant mass ow through the nozzle over the range of parameters considered, an increase in L s /D s produces an increase in the lm thickness at the ori ce exit, a decrease in the spray cone half-angle, and a slight decrease followed by an increase in the discharge coef cient. Conversely, increasing l o /d o decreases lm thickness, spray cone angle, and discharge coef cient. An increase in D s /d o results in a decrease in lm thickness and discharge coef cient and a decrease in spray cone angle. Nomenclaturechamber diameter, m d o = exit-ori ce diameter, m K = atomizer geometric constant, A p / ( D s d o ) L s = swirl-chamber length, m l o = ori ce length, m m = vertex mass Çm = mass-ow rate, kg/s p = mean pressure, N/m 2 p 1 = ambient pressure, N/m 2 R 1 , R 2 = radii of curvature, m r = radial coordinate, m t = time, s t s = lm thickness, m t ¤ s = dimensionless lm thickness, t s / (d o / 2) u = axial velocity, m/s v = radial velocity, m/s w = swirl velocity, m/s x = axial coordinate, m D p = pressure differential, N/m 2 h = spray cone half-angle, deg l = dynamic viscosity, kg m/s l t = turbulent dynamic viscosity, kg m/s q = uid density, kg/m 3 r = surface tension, N/m

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confidence: 64%

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confidence: 99%

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

et al. 2000

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“…Recently, the computational studies of the internal flows in atomizers have been carried out. Jeng, et al, [13,14] presented a numerical study of the effects of changes in simplex nozzle geometry on its performance.…”

Section: * Assistant Professormentioning

confidence: 99%

“…Jeng, et al, [13,14] applied a mixing length model to calculate the turbulent viscosity. In this study, the standard k-ε model [28] is used.…”

Section: Numerical Aspectmentioning

confidence: 99%

Numerical Study of Inlet and Geometry Effects on Discharge Coefficients for Liquid Jet Emanating From a Plain-Orifice Atomizer

Yeh

2002

J. mech.

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A computational model for flow in a plain-orifice atomizer is established to examine the inlet and geometry effects on discharge coefficients. The volume of fluid (VOF) method with finite volume formulation was employed to capture the liquid/gas interface. A continuum Surface Force (CSF) model was adopted to model the surface tension. The body-fitted coordinate system was used to facilitate the configuration of the atomizer. The influences of the inlet chamfer angle, the orifice length/diameter ratio, the Reynolds number, and the inlet turbulence intensity are analyzed. It is found that the optimum discharge coefficient occurs at a chamfer angle of about 50°. The discharge coefficient at first increases with the increase in the orifice length/diameter ratio and then it decreases. The discharge coefficient increases with the increase in the Reynolds number up to Re = 40000, after which it remains sensibly constant. The influence of the inlet turbulence intensity on discharge coefficient is not significant, especially for a longer orifice.

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“…Difficulties especially come from capturing fluid instabilities and the interphase physics that cause liquid sheet to break-up into different sizes of droplets, while being subjected to anisotropic non-homogeneous turbulence. Many numerical studies have focused on tracking of the liquid/gas interface inside the atomizer in order to provide a prediction of air core and liquid sheet [10][11][12]. Similarly, Yeh [13] conducted turbulent flow simulations of liquid jet emanating compared different turbulent models and provided turbulent intensity at the atomizer exit for the pressure-swirl atomizer.…”

Section: Introductionmentioning

confidence: 99%

Numerical description of a pressure-swirl nozzle spray

Qin

Loth

2016

Chemical Engineering and Processing - Process Intensification

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A B S T R A C T Pressure-swirl nozzles are widely used in both industrial and experimental processes. However, the spray flow fields are difficult to predict due to the complexities of the dense break-up region. Herein, an inflow boundary condition approach is employed whereby droplets are computationally injected at 9 mm downstream of the orifice based on experimentally derived descriptions of the mean droplet and gas velocities, combined with empirical relations for turbulent kinetic energy and dissipation. The gas flow is then predicted with a Reynolds-Averaged Navier-Stokes solution while the particle trajectories are computed with a discrete random walk model. This approach was found to reasonably describe downstream spatial distribution of gas and droplet velocity, with moderate mesh resolution and CPU time. In addition, the evolution of the droplet velocity fluctuations was found to be consistent with turbulent diffusion theory based on the local Stokes numbers and turbulent kinetic energy.

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Computational and experimental study of liquid sheet emanating from simplex fuel nozzle

Cited by 11 publications

References 6 publications

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

Parametric Study of Simplex Fuel Nozzle Internal Flow and Performance

Numerical Study of Inlet and Geometry Effects on Discharge Coefficients for Liquid Jet Emanating From a Plain-Orifice Atomizer

Numerical description of a pressure-swirl nozzle spray

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