Numerical study of a swirl atomized spray response to acoustic perturbations

Alireza Ghasemi, J.B.W. Kok

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Abstract

A numerical study of the spray evaporation response to acoustic perturbations is presented. Thermoacoustic instabilities are the result of a resonant loop between the acoustic pressure waves in the form of velocity fluctuations and the heat release of the combustion phenomena. Premixed flame instability can be relatively simply characterized through the flame transfer function (FTF). In the case of non-premixed and partially premixed spray flames, the droplet atomization and subsequent evaporation is known to be related to the heat release rate of the combusting flame and have an effect on the resulting FTF. This paper examines the interaction between the acoustic field perturbation and the droplet evaporation by means of a numerical simulation of a pressurized Airblast type swirl atomizer. The fuel droplets are introduced into the computational domain of the burner at the location of film release and break up in a simplified droplet injection model. The resulting Eulerian-Lagrangian fuel spray simulation is used to represent the spray evolution after fuel film breakup within the shear region of the swirl atomizer. The droplet evolution is studied in the downstream region. In contrast with observations in other burners, in this specific burner design, the evaporation phenomena do not respond significantly to the high frequency velocity forcing. The interplay between the slip velocity perturbations and the vaporization rate is shown to have a complicated dependency on forcing amplitude in swirl atomizers

Original languageEnglish
Title of host publicationProceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
PublisherInternational Institute of Acoustics and Vibration (IIAV)
Pages955-968
ISBN (Electronic)9781999181000
ISBN (Print)9781510892699
Publication statusPublished - 1 Jan 2019
Event26th International Congress on Sound and Vibration, ICSV 2019 - Hotel Bonaventure, Montreal, Canada
Duration: 7 Jul 201911 Jul 2019
Conference number: 26

Conference

Conference26th International Congress on Sound and Vibration, ICSV 2019
Abbreviated titleICSV 2019
CountryCanada
CityMontreal
Period7/07/1911/07/19

Keywords

  • Airblast swirl atomizer
  • Evaporative sprays
  • Thermoacoustics
  • Turbulent combustion

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