Sheet-breakup characteristics of a closed-type swirl injector considering internal flow instability

Jeong, Seokgyu; Yoon, Youngbin

doi:10.1016/j.actaastro.2021.05.049

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…where θ is the spray cone semi-angle and A is the area of the discharge orifice. Fu et al [6] and Jeong and Yoon [16] determined the experimental liquid film velocity by the displacements of disturbance wave peaks close to the film breakup. Figure 3 depicts consecutive images of a liquid film showing the displacements of a wave peak close to the breakup region, using the optical system with a high-speed camera.…”

Section: Droplets and Liquid Films Velocitiesmentioning

confidence: 99%

“…The velocity of spray atomization can be analyzed from two perspectives, one about the liquid film [6,16] and the other about the droplets formed after the liquid film breakups [17][18][19]. Various works in the literature compare the velocity of the droplets to the velocity of the surrounding spray or the velocity of the liquid to the velocity of a gas being ejected by the same injector.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study of droplet and liquid film velocities in sprays

Machado¹,

Costa²,

Andrade³

et al. 2023

Meas. Sci. Technol.

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This study presents a comparative analysis of droplet and conical liquid film velocities in sprays by a pressure swirl injector with Abramovich geometric constant K = 1.986. The velocities were measured simultaneously by schlieren image velocimetry (SIV) and sequential images of the liquid film, using a high-speed camera with 8192 fps and shutter of 2 μs. Other parameters, such as discharge coefficients, spray cone angles and breakup lengths were also determined, using water as test fluid, for injection pressures from 0.05 to 0.5 MPa. Experimental velocity data were compared to results from different semi-empirical equations. The breakup lengths decreased continuously from around 20 mm to 15 mm for injection pressures from 0.1 to 0.5 MPa, while spray cone angles increased continuously from about 42o to 53o, for pressures from 0.2 to 0.5 MPa. Mean axial droplet velocities varied from 4.7 m/s to 14.5 m/s, while the mean total droplet velocities varied from 5 m/s to 16.2 m/s and the total liquid film velocity increased from 5.7 m/s to 20.2 m/s, approximately, for increasing injection pressure. Liquid film velocities were about 15 % to 28 % higher than the droplet velocities in the pressure range considered, due to the energy required for liquid film breakup and the air drag on the droplets. The current findings underscore that significant discrepancies may arise when relying on inadequate velocity data, particularly when employed in the computation of key parameters such as the Reynolds and Weber numbers.

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Section: Droplets and Liquid Films Velocitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative study of droplet and liquid film velocities in sprays

Machado¹,

Costa²,

Andrade³

et al. 2023

Meas. Sci. Technol.

View full text Add to dashboard Cite

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Experimental investigation on a novel external-mixing prefilming atomizer for advanced aircraft engines

He,

Tang,

Fan

et al. 2024

Aerospace Science and Technology

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Numerical investigations on the deformation and breakup of an n-decane droplet induced by a shock wave

2022

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This paper adopts the coupled level-set and volume-of-fluid (CLSVOF) and the large eddy simulation (LES) methods to simulate the deformation and breakup of an n-Decane droplet under the action of shock wave. We aim to investigate the effects of the shock Mach number and droplet diameter on temporary deformation and breakup characteristics at high Weber numbers from 5813 to 22380. Additionally, special attention is paid to subsequent sub-droplet size distributions, which many researchers generally ignore. The results indicate that the evolution of droplet deformation and breakup in the shear breakup regime generally agrees with the obtained experimental data. Based on the present methods, the physical mechanisms for variations of multiple recirculation zones and the development of Kelvin-Helmholtz instability in wave formation are discussed. Larger shock Mach number and smaller droplet diameter can significantly increase the cross-stream and stream-wise deformations. Moreover, both relaxation and breakup times are directly proportional to the initial droplet diameters but inversely proportional to the shock Mach numbers. Eventually, as the shock Mach number increases, the superficial area and mass ratios of sub-droplets to parent droplets all increase from 5.596 to 8.278 and from 23.38% to 38.38%, while the ratios respectively increase from 2.652 to 18.523 and from 4.63% to 92.7% as the droplet diameter decreases.

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Sheet-breakup characteristics of a closed-type swirl injector considering internal flow instability

Cited by 5 publications

References 24 publications

Comparative study of droplet and liquid film velocities in sprays

Comparative study of droplet and liquid film velocities in sprays

Experimental investigation on a novel external-mixing prefilming atomizer for advanced aircraft engines

Numerical investigations on the deformation and breakup of an n-decane droplet induced by a shock wave

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