Investigation of Atomization Performance on a Centrifugal Fuel Slinger With a Phase Doppler Anemometer

Xue, Zhiliang; Li, Feng; Zhu, Yilin; Jiang, Zhi; Zhou, Yingshan; Wu, Xuecheng

doi:10.1615/atomizspr.2021037284

Cited by 2 publications

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“…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%

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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Section: Introductionmentioning

confidence: 99%

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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Liquid Atomization in Rotary Slinger Injectors: Role of Liquid Delivery Manifold

Chakraborty,

Kumar,

Sahu

et al. 2024

Journal of Propulsion and Power

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In rotary injectors, the method of liquid delivery can play an important role in the quality of liquid atomization. In slingers, which are employed in small gas turbine engines, the liquid delivery manifold is a key component in the atomizer assembly, which not only delivers the liquid to the atomizer but also acts as a fuel metering device. In the present work, we investigate the liquid atomization in a slinger atomizer with a focus on the effect of the number of liquid delivery ports and port size in the static manifold. Different optical diagnostics are employed to visualize primary liquid breakup and measure droplet size. The results showed that, at a low liquid feed rate, a smaller number of injection ports or port size promotes supercritical breakup (annular liquid exit and disintegration) at an orifice exit such that the breakup length and droplet size are smaller. Also, hole-to-hole variation in the liquid breakup mode is noticed, which refers to different breakup mechanisms in adjacent slinger orifices. On the other hand, Coriolis-induced film breakup is promoted when the liquid feed rate increases. The present study highlights that the design of the delivery manifold can potentially influence spray performance in slinger injectors.

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Investigation of Atomization Performance on a Centrifugal Fuel Slinger With a Phase Doppler Anemometer

Cited by 2 publications

References 0 publications

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

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

Liquid Atomization in Rotary Slinger Injectors: Role of Liquid Delivery Manifold

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