Turbulent flow simulation of liquid jet emanating from pressure-swirl atomizer

Yeh, Chun-Lang

doi:10.1007/s00231-007-0237-8

Cited by 13 publications

(11 citation statements)

References 14 publications

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“…13 without setting any limitation on difuassion flux of scalar (Eqs. 14 and 15 respectively) [19] α n α n t α ,f n f n (14) α n α n t α ,f n f n (15) Here, α p represents volume fraction at cell centeroid of the computational cell while variables α p,f and V f are calculated at face centeroids surrounding the very computational cell respectively.…”

Section: Implicit and Euler-explicit Schemesmentioning

confidence: 99%

“…Simplicity of schemes like Implicit or Euler-Explicit available with the VOF model absorbed attention of researchers like Yeh [15] who showed closely matching results for a set of turbulent models. Simplicity stems from the fact that such schemes rely fundamentally on averaging process and hence fail to represent sudden jumps for variables like density and viscosity.…”

Section: Introductionmentioning

confidence: 99%

“…al [16] are among researchers who used Geometric-Reconstruction scheme in their modeling. Mandal et al [8] and Madsen et al [16] were among researchers used adaptive mesh refinement technique in their numerical modeling while this technique was absent in work of researchers like Hansen et al [10] and Yeh [15].…”

Section: Introductionmentioning

confidence: 99%

“…At the inlet, a uniform velocity profile is assumed and turbulence parameters of K=0.03(U in 2 ) and ε K 1.5 /(0.005D sw ) are applied [15]. The chamber attached to the orifice is initially filled with air at atmospheric pressure.…”

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confidence: 99%

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An Optimum Method of Capturing Interface and a Threshold Weber Number for Inclusion of Surface Tension Force in Simulation of Nozzle Internal Flow in Pressure Swirl Atomizers

Baharanchi

Darus²,

Ansari

et al. 2012

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D

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Numerical study of internal nozzle flow in simplex atomizer is now well established to represent features of the flow such as turbulence, swirl, and interface between phases. However, an attempt is still needed to introduce an optimum method to capture the interface between liquid and gas with satisfactory level of sharpness. Besides, a detailed study must be dedicated to quantify the influence of surface tension force on evolution of interface shape and flow variables and to determine the necessity of inclusion of this force in molding of this particular type of flow. In the present study RNG K-ԑ model has been used in Fluent 6.3 to compare performance of four interface schemes and introduce an optimum method in terms of computational effort and grid size requirement. Later, combination of the CSF model, RNG K-ԑ model and Implicit scheme has been used to introduce a threshold Weber number below which inclusion of surface tension will considerably influence the flow field during intermediate time steps.

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Section: Implicit and Euler-explicit Schemesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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An Optimum Method of Capturing Interface and a Threshold Weber Number for Inclusion of Surface Tension Force in Simulation of Nozzle Internal Flow in Pressure Swirl Atomizers

Baharanchi

Darus²,

Ansari

et al. 2012

Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D

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“…It was finally concluded that atomizer with a larger orifice diameter and shorter orifice length gives larger air core inside the swirl chamber. Yeh et al [8] established a numerical model to study the flow in plain orifice atomizers with chamfered or rounded orifice inlets. It was concluded that atomizer with a rounded orifice inlet is beneficial for better atomization.…”

Section: Introductionmentioning

confidence: 99%

Influence of Convergence Angle on Hollow Cone Spray Characteristics

Ghate¹,

Sundararajan²

2019

Proceedings of the 6th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'19)

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Simplex atomizer (Pressure swirl atomizer) is widely used in liquid rocket engines and gas turbines because of its enhanced atomization characteristics. In a simplex atomizer, swirling motion is imparted to the liquid by the tangential entry of the fuel. In turn, a hollow cone fuel spray is produced from the orifice under the action of centrifugal force. Liquid properties, injection flow conditions and atomizer geometry govern the performance of an atomizer. Thus, it is very important to study the effects of these parameters, for optimizing the spray characteristics in terms of the drop sizes and spray cone angle. The swirl chamber convergence angle (θ C) is one of the most important parameters which affects the injector performance. Very few researchers have focused on this aspect. In this paper, an experimental parametric analysis is performed to investigate the effect of swirl chamber convergence angle on the performance of simplex atomizer and the characteristics of the hollow conical liquid jet exiting the nozzle. Four different simplex atomizers with varying convergence angle (30°, 45°, 60° and 75°) are used for the experimental study. All other geometrical parameters are kept the same. The atomization behaviour which includes spray cone angle, coefficient of discharge, Sauter mean diameter (SMD) and drop size distribution is analyzed at various radial locations by using a high-speed camera and Phase Doppler Interferometer (PDI). Experiments are carried out at different pressures ranging from 0 to 7 bar to characterize the atomizer performance at different operating conditions.

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