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Numerical study of liquid jet in swirling cross flow

Prakash, S and Jain, M and Raghunandan, BN and Ravikrishna, RV and Tomar, G (2015) Numerical study of liquid jet in swirling cross flow. In: ICLASS 2015 - 13th International Conference on Liquid Atomization and Spray Systems, 23 - 27 August 2015, National Cheng Kung UniversityTainan; Taiwan.

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Liquid jet in crossflow finds direct applications in different engineering fields, more specifically in the aerospace industry and gas turbine engines. This article presents Volume-Of-Fluid based numerical simulations of a liquid jet injected into gas-crossflow in swirling motion. The liquid jet is injected radially outwards from a central tube to a confined annular space with gas crossflow � a configuration that may be found in modern gas turbine combustors. The simulations are conducted at high liquid-to-gas density ratio (D) of 180:1 and liquid-to-gas momentum ratio (Q) of 20. The Swirl Number (SN) of the gas crossflow is varied between 0 and 0.42. The liquid jet undergoes column and shear modes of breakup as observed in experimental studies. The fluctuations in spray trajectory are also captured that are caused by the variations in column breakup lengths which in turn give rise to a whip-lash action of the liquid jet. The resultant spray trajectory is observed to follow the well-established power-law, depending primarily on momentum ratio, for the zero-swirl condition. It is also observed that the radial penetration of the spray is lowered by the presence of swirling motion of the gas. The drop size measurements are made at different locations downstream upto 35 diameters. A simple criterion based on the shape of the droplet is defined for a better and more practical alternative to the regular Sphericity number. Only those droplets falling below a set threshold are considered for further analyses. It is observed that the drop-size distribution closely follows the log-normal distribution. The Sauter mean Diameter (SMD) of the droplets are found to typically vary around 60 microns. It may be stated that these high-fidelity numerical simulations successfully capture the physics involved in the breakup of a liquid jet in crossflow � most important being that of primary breakup. © 2015 International Conference on Liquid Atomization and Spray Systems. All rights reserved.

Item Type: Conference Paper
Publication: ICLASS 2015 - 13th International Conference on Liquid Atomization and Spray Systems
Publisher: Institute for Liquid Atomization and Spray Systems
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 14 Mar 2021 12:30
Last Modified: 14 Mar 2021 12:30
URI: http://eprints.iisc.ac.in/id/eprint/67058

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