Swirl effect on the spray characteristics of a twin-fluid jet

Rho, Byung Joon; Kang, Sung Goon; Oh, Jeongmin; Lee, Sam Goo

doi:10.1007/bf02945557

Cited by 19 publications

(16 citation statements)

References 4 publications

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“…Thus, it can be explained that the fully developed atomization might be started from this axial location. This is diametrically opposite phenomena when compared to the previous investigations reported by Rho (1998) for two-phase flows, Dodge and Moses (1984) for a simplex pressure-atomizing nozzle, and by Yule et al (1983) with a twin -fluid atomizer.…”

Section: Droplet Mean Diametermentioning

confidence: 57%

“…The previous results obtained by Rho (1998) showed that the droplet number density for an external oriented swirling case decreased more rapidly due to the greater jet expansion and faster decay of droplet axial velocity. However, it is interesting to consider that the profiles for the number density in this experiment show no definite dissimilarity depending on the presence of higher air flow rates, resulting in a more uniform distribution of number density across the spray when compared.…”

Section: Number Densitymentioning

confidence: 71%

“…Rao and Lefebvre(l975) have shown that an increase in fuel injection pressure and air velocity tend to produce better atomization. Rho et al (1998) investigated on the swirl characteristics, and concluded that the air velocity and optimum swirl were the most important factors influencing droplet atomization.…”

Section: Introductionmentioning

confidence: 99%

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Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

Lee

Rho

2000

KSME International Journal

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In an effort to illustrate the global variation of SMD(Sauter mean diameter, or D32) and AMD (Arithmetic mean diameter, or D lO ) at five axial downstream locations (i. e., at Z=30, 50, 80, 120, and 170 mm) under the different experimental conditions, the radial coordinate is normalized by the spray half-width. Experimental data to analyze the atomization characteristics concerning with an internal mixing type have been obtained using a PDPA (Phase Doppler Particle Analyzer). The air injection pressure was varied from 40 kPa to 120 kPa. In this study, counterflowing internal mixing nozzles manufactured at an angle of 15·with axi-symmetric tangential-drilled four holes have been considered. By comparing the results, it is clearly possible to discern the effects of increasing air pressure, suggesting that the disintegration process is enhanced and finer spray droplets can be obtained under higher air assist. The variations in D 32 are attributed to the characteristic feature of internal mixing nozzle in which the droplets are preferentially ejected downward with strong axial momentum, and dispersed with the larger droplets which are detected in the spray centerline at the near stations and smaller ones are generated due to further subsequent breakup by higher shear stresses at farther axial locations. The poor atomization around the centre close to the nozzle exit is attributed to the fact that the relatively lower rates of spherical particles are detected and these drops are not subject to instantaneous breakup in spite of the strong axial momentum. However, substantial increases in SMD from the central part toward the edge of the spray as they go farther downstream are mainly due to the fact that the relative velocity of droplet is too low to cause any subsequent disintegration.

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Section: Droplet Mean Diametermentioning

confidence: 57%

Section: Number Densitymentioning

confidence: 71%

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Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

Lee

Rho

2000

KSME International Journal

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“…Therefore, the interactions between swirling air and HFO droplets have always been a challenging subject for the combustion researchers. There are some experimental efforts to address this important issue [10][11][12]. These references investigated and reported their particular spray configuration and its swirling air effect.…”

Section: Introductionmentioning

confidence: 99%

Heavy Fuel Oil Droplet Breakup and Dispersion Study

Darbandi¹,

Fatin²,

Schneider³

2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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-The impact of flow swirl on heavy fuel oil (HFO) droplet breakup and dispersion is investigated using the finite-volume method. The numerical framework considers suitable models to predict the droplets' breakups and their dispersions affected by their interaction with turbulence. The validation of chosen models is carried out by comparing the current results with those of previous numerical studies. After validation procedure, three different flow conditions are constructed to expand the study to various swirl number influences. The aim is to investigate the interaction of HFO spraying with the crossed axial swirling flow. The results show that the droplet Sauter mean diameter decreases continuously and the spray becomes finer as the swirling flow strength increases. Dispersion of the finer spray grows up and the spray becomes wider for the stronger swirling flow conditions. Also, the focus on the droplets' concentration shows that the droplets' concentration decreases for higher swirl number flows. This reduction is mainly due to the droplets' dispersion into a larger volume of space. In other words, the spray's width becomes much wider by increasing the swirling influences. It can be concluded that the strong swirling flow can improve the combustion quality of HFO via improving the mixing process and also via controlling the flame structure. The quantifications are performed subsequently.

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“…Hence, it is evident that the turbulence characteristics of flow field govern the spray behaviour. Rho et al (1998) investigated the turbulent shear stress with the swirl angle in a two-phase swirling jet. Kim.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on turbulent characteristics of an impinging split-triplet injector

Kang

Ryu

Kwon

et al. 2001

KSME International Journal

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This paper presents turbulent characteristics of an impinging F-0-0-F type injector in which fuel and oxidizer impinge on each other to atomize under the different momentum ratio. Water was used as an inert simulant liquid instead of fuel and oxidizer. The droplet size and velocity in the impinging spray flow field were measured using a PDPA. The gradient of the spray halfwidthtb-) along the long-axis direction declined throughout the entire spray flow field with increasing the momentum ratio from 1.19 to 6.48. However, the gradient of the half-widthfb.) along the short-axis direction decreased with increasing the momentum ratio. The turbulence intensity and turbulent kinetic energy were converged into the center of the initial region with increasing the momentum ratio. As the momentum ratio increased from MR=1.19 to MR=6. 48, the turbulent shear stress decreased. The results of this study can be used for the design of an impinging type injector for liquid rockets.

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Swirl effect on the spray characteristics of a twin-fluid jet

Cited by 19 publications

References 4 publications

Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

Atomization characteristics in pneumatic counterfiowing internal mixing nozzle

Heavy Fuel Oil Droplet Breakup and Dispersion Study

An experimental study on turbulent characteristics of an impinging split-triplet injector

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