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Characterization of Spray Flows Under High Fuel Temperature Using Phase Doppler Anemometer

  • Tomio Obokata
  • Tsuneaki Ishima
  • Tetsuji Koyama
  • Kouichi Uehara
  • Kazumitsu Kobayashi
  • Masayoshi Tsukagoshi
Conference paper

Abstract

Effects of fuel temperature on the characteristics of the intermittent-cyclic spray have been experimentally clarified using the phase Doppler anemometer. The spray was initiated from the air assisted fuel injector. The injection frequency was 50Hz, and the pressures of the liquid fuel (n-heptane) and air were 250kPa and 147kPa, respectively. The fuel temperature was changed from 293K (20°C, room temperature) to 413K (140°C).

Experimental results showed that the mean velocity of the droplets increased with the fuel temperature. The Sauter mean diameter increased in the fuel temperature region from 293K to 343K for intermittent spray and from 293K to 323K for continuous steady spray. After the regions, it decreased. The droplets with higher fuel temperature and larger diameter have smaller decaying ratio of the velocity. These features are well explained by the analyses using grouped data classified by the droplet diameter or temporally divided velocity history of the intermittent spray. Evaluation of the droplet size distribution has also been performed by a log-hyperbolic (LH3) type fitting function.

Keywords

Air-Assisted injector Spray Flow PDA Fuel Temperature 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Tomio Obokata
    • 1
  • Tsuneaki Ishima
    • 1
  • Tetsuji Koyama
    • 2
  • Kouichi Uehara
    • 1
  • Kazumitsu Kobayashi
    • 3
  • Masayoshi Tsukagoshi
    • 3
  1. 1.Department of Mechanical System EngineeringGunma UniversityTenjin-choJapan
  2. 2.Tsukasa Sokken Co., LTDTamazutsumi, TokyoJapan
  3. 3.Unisia Jecs Co.KasukawaJapan

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