Droplet dispersion and turbulent structure in a pressure-atomized spray flame

Nobuyuki Kawahara, Yuji Ikeda, Tsuyoshi Nakajima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Investigation of the relationship between droplet dispersion and turbulent mixing in a pressure-atomized spray flame with a recirculation region was done. Time-resolved information of instantaneous droplet velocities and interarrival-time statistics of the droplet were obtained and examined in order to observe the turbulent mixing and follow/ penetration criteria. In order to observe the detailed structure of spray flames, the size and velocity of droplets instantaneously were measured by phase Doppler anemometer. The group combustion number was calculated by the experimental data in order to elucidate the actual aspects of group combustion. It was found that the turbulent coherent structures were contributed in order to form droplet clusters of small droplets under 30 µm because of its momentum, inertia and followability. The cluster dimensions obtained corresponded with the integral scale of turbulent vortex measured. While, large droplets penetrates strongly due to large momentum and less shear flow information along the spray cone so that group combustion characteristics could not be observed. The interaction and its relation of turbulent scale and group combustion cluster was discussed with measured data for a practical oil burner of 0.1MW.

Original languageEnglish
Title of host publication35th Aerospace Sciences Meeting and Exhibit
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Publication statusPublished - 1997
Externally publishedYes
Event35th Aerospace Sciences Meeting and Exhibit, 1997 - Reno, United States
Duration: Jan 6 1997Jan 9 1997

Other

Other35th Aerospace Sciences Meeting and Exhibit, 1997
CountryUnited States
CityReno
Period1/6/971/9/97

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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    Kawahara, N., Ikeda, Y., & Nakajima, T. (1997). Droplet dispersion and turbulent structure in a pressure-atomized spray flame. In 35th Aerospace Sciences Meeting and Exhibit [AIAA Paper 97-0125] American Institute of Aeronautics and Astronautics Inc, AIAA.