Numerical Study of Impinging Sprays Considering Anisotropic Characteristics of Turbulence

비등방성 난류특성을 고려한 분무의 벽면충돌 현상에 대한 수치해석 연구

  • 고권현 (중앙대학교 기계공학부) ;
  • 유홍선 (중앙대학교 기계공학부) ;
  • 이성혁 (서울대학교 터보동력기계연구센터)
  • Published : 2003.05.01

Abstract

It is an aim of this study to perform extensive numerical study for analyzing the anisotropic turbulence effects on spatial and temporal behaviors of diesel sprays after wall impingement. The turbulence model of Durbin is used for comparisons with the $k-\varepsilon$ model. The turbulence-induced dispersions of droplets are considered to describe the anisotropy of turbulence effectively and the spray/wall interactions are simulated using the model of Lee and Ryou. The present study investigates the internal structures of impinging diesel sprays such as Sauter mean diameter (SMD), loca1 droplet velocities, and local gas velocities and also compares the results predicted by two turbulence models with the experimental data. The Durbin's model considering the anisotropy of turbulence predicts both gas and droplet tangential velocities better than the$k-\varepsilon$ model does. It is concluded that the anisotropy of turbulence should be considered in simulating impinging diesel sprays.

Keywords

References

  1. SAE 890264 Characteristics of a Diesel Spray Impinging on a Flat Wall N. Katsura;M. Saito;J. Senda;H. Fujimoto
  2. Proc. of COMODIA 90 Characteristics of a Diesel Spray Impinging on a Flat Wall H. Fujimoto;J. Senda;M. Nagae;A. Hashimoto;M. Saito;N.Katsura
  3. SAE 940678 Flow and Heat Transfer Characteristics of Impinging Transient Diesel Sprays C. Arcoumanis;J.-C. Chang
  4. SAE 880107 Modeling Engine Spray/Wall Impingement J. D. Naber;R. D. Reitz
  5. SAE 950283 Development of Methodology for Spray Impingement Simulation J. D. Naber;R. D. Reitz
  6. Int. J. of Multi-phase Flow v.26 Development of a New Spray/Wall Interatction Model S. H. Lee;H. S. Ryou https://doi.org/10.1016/S0301-9322(99)00080-4
  7. AIAA Journal v.33 no.4 Separated Flow Computations with the Model P. A. Durbin https://doi.org/10.2514/3.12628
  8. Atomization and Spray Technology v.3 Modeling Atomization Processes in High-Pressure Vaporizing Sprays R. D. Reitz
  9. Ph. D. Thesis, Princeton University Collective Drop Effects on Vaporizing Liquid Sprays P. J. O'Rourke
  10. J. Fluid Mech. v.283 Impact of Drops on Solid Surfaces : Self-Similar Capillary Waves, and Splashing as a New Type of Kinematic Discontinuity A. L. Yarin;D. A. Weiss https://doi.org/10.1017/S0022112095002266
  11. AIAA Paper 81-0323 Aspects of Computer Simulation of Liquid-Fuelled Combustors A. D. Gosman;E. Ioannides