Numerical simulation of the internal flow of swirl atomizer under ambient pressure

Fu, Qiuyun

doi:10.1177/0954406215598803

Cited by 9 publications

(7 citation statements)

References 23 publications

(34 reference statements)

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“…Binnie and Harris (1950) studied the effect of surface tension for the dynamics of the air core theoretically and concluded that it is negligible. Numerical studies on pressure-swirl atomizer inner nozzle flow are numerous but relevant for this study are the works of Dash et al (2001), Fu (2016), Galbiati et al (2016b) and Renze et al (2011).…”

Section: Introductionmentioning

confidence: 99%

Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

Laurila

Roenby

Maakala

et al. 2019

International Journal of Multiphase Flow

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A computational fluid dynamics study is carried out on the inner nozzle flow and onset of liquid sheet instability in a large-scale pressure-swirl atomizer with asymmetric inflow configuration for high viscosity fluids. Large-eddy simulations (LES) of the two-phase flow indicate the unsteady flow character inside the nozzle and its influence on liquid sheet formation. A novel geometric volume-offluid (VOF) method by Roenby et al., termed isoAdvector, is applied for sharp interface capturing (Roenby J., Bredmose H., Jasak H., 2016, A computational method for sharp interface advection, Royal Society Open Science 3). We carry out a Reynolds number sweep (420 ≤ Re ≤ 5300) in order to investigate the link between the asymmetric inner nozzle flow and liquid sheet characteristics in laminar, transitional and fully turbulent conditions. Inside the nozzle, the numerical simulations reveal counter-rotating Dean vortices, flow impingement locations, and strong asymmetric flow features at all investigated Reynolds numbers. A helical, rotating gaseous core is observed when Re ≥ 1660. For laminar flow (Re = 420), an S-shaped liquid film is observed, while the gas core presence at Re ≥ 1660 results in a hollow cone liquid sheet. For the intermediate value Re = 830, the numerical simulations indicate a liquid sheet of mixed type.

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Section: Introductionmentioning

confidence: 99%

Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

Laurila

Roenby

Maakala

et al. 2019

International Journal of Multiphase Flow

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“…Velocity coefficient (c) is taken as 0.7 with an estimation and total velocity is found using equation 1.9. Another research on open-end type pressure swirl atomizer was carried out by Fu [23].…”

Section: Literature Surveymentioning

confidence: 99%

“…Tangential and radial velocities through the slit (mass flow inlet) were defined by considering conservation of the mass and angular momentum [33], [34], [35]. Despite the fact that, Reynolds number of flow through the tangential inlet was from 11000 to 28000 for the mass flow rates which were tested, the solver was chosen laminar due to the laminarising effect of the swirling flow [36], [37].…”

Section: Two-dimensional Axisymmetric Analysesmentioning

confidence: 99%

Experimental and Numerical Investigation of Coaxial Pressure Swirl Injectors

Baran¹,

Özyörük

Sumer³

2019

AIAA Scitech 2019 Forum

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pagesExperimental and numerical investigations were carried out for determining spray characteristics of a liquid-liquid coaxial injector in this work. As a baseline injector, the RD-0110 rocket engine injector was chosen which consists of two coaxial atomizers. The inner atomizer is an open-end type pressure swirl atomizer which supplies oxidizer, whereas the outer one is a closed-end type pressure swirl atomizer which supplies fuel. Tests were carried out for two different recess lengths and various mass flow rates. A high-speed camera was used to determine the spray cone angles, while a phase Doppler particle analyzer (PDPA) was employed to characterize the distributions of various parameters. More specifically two-dimensional velocity profiles and Sauter mean diameters (SMD) were obtained for both inner atomizer and the coaxial injector, but PDPA measurements could not be performed for the outer one due to the high spray cone angle. Also, 2D axisymmetric swirl and 3D CFD analyses were carried out for the inner and outer atomizers at different mass flow rates.Experimental and numerical results are compared in detail. Results show that big spray droplets move with the same velocity as that of the liquid film, whereas small droplets move with the air. When the inner and outer atomizers operate together, their spray cone angles change from those observed from standalone operations. Spray cone angle of the outer atomizer decreases, while that for the inner one increases, but they later vi merge at some point and forms a single spray. It was observed that the inner atomizer has more effect on this spray than the outer atomizer. Comparing the two different recess length reveals that recess length is significant parameter which affects spray properties. Lastly, comparing the experimental and numerical results proved that numerical analyses match well with test results. Therefore, numerical analyses can be used to find the velocity profile of the spray prior to detailed measurements.

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“…Radial component of velocity is adjusted to satisfying the mass flow rate value. Tangential component of velocity is adjusted to the mean velocity in the tangential ports to satisfy the angular momentum that enters the atomizer[29],[45],[46]. Boundary condition of velocity inlet is set to a line which has 1.7 mm length.…”

mentioning

confidence: 99%

“…The length of the velocity inlet line is set to be equal to the tangential port diameter (Dtp). Hence, the radial velocity at tangential ports can be calculated by satisfying the conservation of total mass flow rate using Equation (3.4), and the tangential velocity at tangential ports can be calculated by satisfying the angular momentum using Equation (3.5)[46].∂(ρV ⃗ ⃗ ) ∂t + ∇. (ρV ⃗ ⃗ V ⃗ ⃗ ) = −∇p + ∇.…”

mentioning

confidence: 99%

Investigation of the Effect of Geometrical Parameters of Pressure Swirl Atomizer on the Hollow Cone Spray

Tokgöz¹,

Sumer²,

Ulaş

2019

AIAA Propulsion and Energy 2019 Forum

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In this study, effects of geometrical parameters of pressure swirl atomizer on the hollow cone spray are investigated experimentally, and physical phenomenon inside the pressure swirl atomizer is investigated numerically. In the experimental studies, hollow cone spray properties are examined macroscopically and microscopically. Macroscopic spray properties are studied by a visual technique called high-speed shadowgraphy. The hollow cone spray images are captured for different geometrical configurations of the pressure swirl atomizer at different flow rates. Then, the mean spray cone angles are obtained using the image processing program and breakup lengths are measured using obtained images. Microscopic properties of spray are researched by Phase Doppler Particle Analyzer system. Microscopic properties of spray such as droplet diameters and velocity distributions are obtained for different geometrical configurations of the pressure swirl atomizer and different flow rates.Within the scope of numerical studies, two-dimensional axisymmetric swirl flow simulations are carried out to examine the internal flow and spray of the pressure swirl atomizer. In these simulations, a computational fluid dynamics tool based on volume of fluid is used. In consequence of experimental studies, it is obtained that spray cone angle is not much sensitive to the mass flow rate, nozzle length, and tangential port number. However, nozzle diameter has a remarkable impact on the spray cone angle. vi Increase in nozzle diameter leads to an increase in the spray cone angle. Decreasing nozzle diameter and increasing mass flow rate result in a shortening of the breakup length. On the other hand, nozzle length and tangential port number have minor effect on the breakup length. Microscopically, x-velocity and y-velocity of the droplets are dependent on the mass flow rate and nozzle diameter, and magnitudes of velocities increase with increasing mass flow rate and decreasing nozzle diameter. On the contrary, nozzle length and tangential port number has a negligible effect on the magnitudes of velocities. Sauter mean diameter of the hollow cone spray increases with increasing nozzle diameter and decreasing mass flow rate, but nozzle length has no significant effect on it. However, increasing tangential port number increases the uniformity of the particle and Sauter mean diameter distribution. As a result of numerical studies, complex two-phase flow and velocity distributions in the pressure swirl atomizer are studied. Numerical results show that spray cone angle and air core diameter remain nearly the same with increasing mass flow rate. On the contrary, increasing mass flow rate causes an increase in axial and swirl velocities.

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Numerical simulation of the internal flow of swirl atomizer under ambient pressure

Cited by 9 publications

References 23 publications

Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

Analysis of viscous fluid flow in a pressure-swirl atomizer using large-eddy simulation

Experimental and Numerical Investigation of Coaxial Pressure Swirl Injectors

Investigation of the Effect of Geometrical Parameters of Pressure Swirl Atomizer on the Hollow Cone Spray

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