Effect of geometric and operating parameters on the spray characteristics of an open-end swirl injector

Chen, Chen; Yang, Yang; Wang, Xiaorong; Tang, Wenxian

doi:10.1177/0954410018824519

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…The angle between the two straight lines was considered the spray cone angle. 24 , 25 Furthermore, the value of the spray cone angle obtained using the empirical formulas and that from the experimental results display good consistency, with a maximum deviation of 5%.…”

Section: Methodsmentioning

confidence: 63%

Investigation of the spray formation and breakup process in an open-end swirl injector

Chen

Tang

2020

Science Progress

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The spray formation and breakup process in an open-end swirl injector were studied through experiments and numerical simulations. A high-speed shadowgraph system and a high-speed backlight system were adopted to record the spray. Volume of fluid was used as the interface tracking method to capture the evolution process. The filling process of the liquid film inside the injector was captured. The air core formation process as observed in the experiments differed from that depicted by the numerical simulation results. The results revealed that the spray pattern of the cross-section at the tangential inlets also varied during the filling process. The evolution of the holes on the liquid film and ligaments was observed. It was determined that the liquid sheet repeatedly exhibited thinning, instability, shedding, breakup, and coalescence in the spray formation and breakup process. The spray pattern underwent the distorted pencil stage, onion stage, tulip stage, and fully developed stage with the increased injection pressure drop. The formation process of the open-end swirl injector also underwent these four stages under an injection pressure drop of 0.5 MPa.

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Section: Methodsmentioning

confidence: 63%

Investigation of the spray formation and breakup process in an open-end swirl injector

Chen

Tang

2020

Science Progress

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“…Since the purpose here is to visualize the liquid breakup structure in the vicinity of the slinger orifices, the front light illumination technique in conjunction with imaging at an oblique direction is adopted. This is advantageous over the conventional shadowgraph imaging 25,26 that hinders the liquid distribution within the orifice. 20 A stroboscope (miniConstellation 120, Veritas, Beam angle: 28°) was used as an illuminating light source, while a CCD camera (PCO pixelfy: 14 bit) coupled with a macro lens (Sigma 150 mm; f/2.8) was used for imaging.…”

Section: Liquid Breakup Visualization Methodsmentioning

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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“…Nowadays, Diffused Back-Illumination (DBI) has been widely used for measuring different parameters in sprays [20][21][22][23][24][25][26][27]. Yan et al [28] investigated macroscopic and microscopic characteristics of flash boiling spray using Diffused Back-Illumination (DBI) imaging and PDA.…”

Section: Introductionmentioning

confidence: 99%

Effects of Varying the Liquid Fuel Type and Air Co-Flow Conditions on the Microscopic Spray Characteristics in an Atmospheric Annular Co-Flow Spray Burner

Vargas

Payri

Rubio³

et al. 2022

SSRN Journal

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Effect of geometric and operating parameters on the spray characteristics of an open-end swirl injector

Cited by 6 publications

References 24 publications

Investigation of the spray formation and breakup process in an open-end swirl injector

Investigation of the spray formation and breakup process in an open-end swirl injector

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

Effects of Varying the Liquid Fuel Type and Air Co-Flow Conditions on the Microscopic Spray Characteristics in an Atmospheric Annular Co-Flow Spray Burner

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