Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers

Malý, Milan; Jedelský, Jan; Slama, Jaroslav; Janáčková, Lada; Sapík, Marcel; Wigley, Graham; Jícha, Miroslav

doi:10.1016/j.ijheatmasstransfer.2018.02.090

Cited by 33 publications

(30 citation statements)

References 20 publications

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“…In fact, simplex spray characteristics have been noted to be closely linked to the internal flow governed by several non-dimensional quantities. Both the Reynolds number (ratio of viscous to inertial forces) as well as the swirl number (ratio of angular to axial momentum) have been noted to be of key relevance in spray characterization (Maly et al, 2018). The complete characterization of the internal flow depends on the geometry of the nozzle as the swirl number is dependent on the capability of the geometry to convert the linear inlet flow into rotational motion.…”

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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“…The important effect of atomizer construction on the atomization process has been observed. Furthermore, a guided experimental study reported that they aimed to intensify the process of atomization and improve the properties of the spray [18].…”

Section: Usage and Performance Of Pressure Swirl Nozzlementioning

confidence: 99%

Design and construction of the pressure swirl nozzle and experimental investigation of spray characteristics

Seyedin

Ahmadi

Seyedin

2019

Teh. glas. (Online)

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This paper focuses on the structure and performance of the pressure swirl nozzle and the study of liquid atomization. In this study, the atomizer has been designed and some experiments have been performed on it. Since image processing is an efficient method for measuring the size of the droplet and since it considerably reduces the total measuring time and eliminates the subjective observer’s error in sizing and counting spray drops, a digital camera has been used for capturing images and image processing has been done by the MATLAB software. The results show that by increasing the atomization air pressure, the spray angle increases and the droplet’s size decreases. It is concluded that the spray angle is a function of the atomization air pressure and orifice diameter. Moreover, when the distance from the spray centre line increases, the droplet’s average velocity decreases.

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“…Pressure swirl atomizers are widely tested in Spray laboratory at Brno University of Technology. The modification of spill-line geometry was tested [2,3], the breakup of liquid sheet was studied [4]. The usage of alternative fuels for atomization was investigated [5].…”

Section: Introductionmentioning

confidence: 99%

Replication of Pressure Swirl Atomizer by 3D Printing and Influence of Surface Roughness on the Atomization Quality

Cejpek¹,

Malý²,

Bělka³

et al. 2020

MATEC Web Conf.

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The replication of atomizers by 3D printing technology is a new approach of producing the pressure swirl atomizers. The surface roughness of 3D printed products and manufacturing accuracy of the 3D printing process influence the atomization of the liquid. The high-speed visualization of a spray, produced by scaled 3D printed atomizer, was performed. The spray stability, cone angle and breakup length were determined. Scaled 3D printed atomizers were tested at equivalent pressures of 0.25, 0.5 and 1 bar. Non-dimensionless parameter, Reynolds number, was preserved for the scaled atomizer. The effect of the surface roughness of the tangential ports, swirl chamber and discharge orifice on atomization was assessed at non-scaled pressure swirl atomizer. The roughness of a swirl chamber was created by corundum and ballotin blasting. The inlet pressures of 2.5, 5 and 10 bar were tested.

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Internal flow and air core dynamics in Simplex and Spill-return pressure-swirl atomizers

Cited by 33 publications

References 20 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

Design and construction of the pressure swirl nozzle and experimental investigation of spray characteristics

Replication of Pressure Swirl Atomizer by 3D Printing and Influence of Surface Roughness on the Atomization Quality

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