Spray Characterization of a Slinger Injector Using a High-Speed Imaging Technique

Rezayat, Sajjad; Farshchi, Mohammad; Mahalegi, Hamed Karimi Motaalegh; Kebriaee, Azadeh

doi:10.2514/1.b36498

Cited by 18 publications

(9 citation statements)

References 34 publications

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“…This is attributed to the dominant role played by the Coriolis acceleration that tends to accumulate all liquid to one side of the channel as soon as the liquid enters the orifice. [14][15][16]19 As a direct consequence of this, the liquid breakup mode is different in comparison to the case where the liquid exists as a film all along the channel wall. 10,11 iii) Depending on the operating condition as well as slinger orifice size, broadly three different modes are observed, viz.…”

Section: Liquid Breakup Visualizationmentioning

confidence: 99%

“…The orifice size below the above optimum size leads to larger droplet size since it promotes subcritical breakup, while the orifice size larger than that does not have the ability to produce small droplets due to irregular breakup. In contrast, Rezayat and co. 14,15,19 and Sahu et al 20 reported dominance of Coriolis-induced breakup that refers to accumulation of the liquid on the side of the orifice which is opposite to the direction of rotation. However, the above research works considered a single orifice size for all experiments.…”

Section: Introductionmentioning

confidence: 96%

“…The fuel from the feed tube is discharged into the slinger disc and ejected out through the orifices on the rotary disk, into the combustion chamber. The orifice channels of the disc may be drilled in radial direction with respect to the engine shaft [11][12][13][14] or at an oblique angle as radial-axial discharge orifices. [14][15][16] Due to large centripetal acceleration, the liquid spreads along the inner side walls of the atomizer cavity and form a thin liquid film inside the atomizer rim.…”

Section: Introductionmentioning

confidence: 99%

“…The orifice channels of the disc may be drilled in radial direction with respect to the engine shaft [11][12][13][14] or at an oblique angle as radial-axial discharge orifices. [14][15][16] Due to large centripetal acceleration, the liquid spreads along the inner side walls of the atomizer cavity and form a thin liquid film inside the atomizer rim. This film acts as a local reservoir that supplies the liquid into the orifice channels.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the liquid is ejected out of the slinger disc into the surrounding where it interacts with the ambient air and experience aerodynamic drag and breaks into droplets to form a spray field. Several studies have been conducted in the past on the primary liquid breakup dynamics in slinger atomizers to study the effect of orifice size and geometry in a single-hole slinger disc, 13 in multiple holes slinger disc, 11 orifice size and arrangement pattern, 12 rotational speed, 13,17,18 angular orientation of high aspect ratio orifices, 14,15,19 and Coriolis force. 20 Some of the above studies also reported measurement of droplet size which is found to reduce for higher rotational speed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of orifice size on liquid breakup dynamics and spray characteristics in slinger atomizers

Chakraborty

Sahu

Maurya

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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The ability of the rotary slingers to achieve fuel atomization by employing the rotational speed of the turbine shaft obviates the use of high-pressure fuel pump and makes those a popular choice for small gas turbine engines. Such atomizers contain arrays of orifices on their outer periphery for injection of the liquid into the combustion chambers. In the present work, we experimentally investigate the influence of the choice of orifice size on primary liquid breakup dynamics and spray characteristics in slinger atomizers. Three slinger discs with the same disc size and number of orifices but with different orifice size, d o (= 1 mm, 1.5 mm, and 2 mm) are examined in a high-speed slinger test rig for a range of rotational speed (2000–10,000 rpm) and liquid feed rate (0.2–1 lpm). The operating conditions are relevant to part-load and engine relighting conditions for which the selection of geometric parameters of the injector may play a crucial role in achieving the atomizer performance. In the current work, the liquid breakup process in the vicinity of the slinger orifices was visualized using front light illumination technique, whereas the pulse-shadowgraph technique was employed for droplet sizing. It is found that smaller orifice size promotes column mode of liquid breakup which results in larger primary liquid breakup length and subsequently results in larger Sauter mean diameter. The results highlight that the orifice size is an important design parameter as the liquid atomization in slinger atomizers is sensitive to the selection of orifice size especially for lower range of rotational speeds.

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