Modeling of Diesel Spray Impingement on a Flat Wall

  • Lee, Seong-Hyuk (Department of Mechanical Engineering, Chung-Ang University) ;
  • Ryou, Hong-Sun (Department of Mechanical Engineering, Chung-Ang University)
  • Published : 2000.07.01

Abstract

To understand the transient behavior of droplets after impingement in a diesel engine, a numerical model for diesel sprays impinging on a flat wall is newly developed by the proposition of several mathematical formulae to determine the post-impingement characteristics of droplets. The new model consists of three representative regimes such as rebound, deposition and splash. The gas phase is modeled in terms of the Eulerian conservation equations, and the dispersed phase is calculated using a discrete droplet model. To validate the new model, the calculated results are compared with several experimental data. The results show that the new model is generally in good agreement with the experimental data. Therefore, it is thought that the new model is acceptable for the prediction of transient behavior of wall sprays.

Keywords

References

  1. Arcoumanis C. and Chang, J. C., 1994, 'Flow and Heat Transfer Characteristics of Impinging Transient Diesel Sprays,' SAE940678
  2. Bai, C and Gosman, A. D., 1995, 'Development of Methodology for Spray Impingement Simulation,' SAE950283
  3. Eckhause, J. E. and Reitz, R. D., 1995, 'Modeling Heat Transfer to Impinging Fuel Sprays in Direct-Injection Engines,' Atomization and Sprays, Vol 5, pp. 213-242
  4. Fujimoto, H., Senda, J., Nagae, M., Hashimoto, A., Saito, M. and Katsura, N., 1990, 'Characteristics of a Diesel Spray Impinging on a Flat Wall.' COMODIA 90 Proceedings of International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines, pp. 193-198, Kyoto, Japan
  5. Gonzalez, M. A., Borman, G. L. and Reitz, R. D., 1991, 'A Study of Diesel Cold Starting Using Both Cycle Analysis and Multidimensional Calculations,' SAE910180
  6. Guerrassi, N. and Champoussin, J. C., 1996, 'Experimental Study and Modeling of Diesel Spray/Wall Impingement,' SAE960864
  7. Katsura, N., Saito, M., Senda, J. and Fujimoto, H., 1989, 'Characteristics of a Diesel Spray Impinging on a Flat Wall,' SAE890264
  8. Kolpakov, A. V., Romanov, K. V. and Titova, E. I., 1985, 'Calculation of the Rebound Condition for Colliding Drops of Sharply Different Sizes,' Kolloidn. Zh., Vol. 47, p. 953
  9. Lee, S. H., Ryou, H. S., and Chae, S., 1999, 'Development of a New Spray/Wall Interaction Model,' 2nd International Symposium on Two-Phase Flow Modeling and Experimentation, Vol. 3, pp. 1915-1999, Pisa, Italy, 23-26
  10. Matsumoto, S. and Saito, S., 1970, 'On the Mechanism of Suspension of Particles in Horizontal Conveying : Monte Carlo Simulation Based on the Irregular Bouncing Model,' J. Chem. Engng. Japan, Vol. 3, pp. 83-92
  11. Mundo, C., Sommerfeld, M. and Tropea, C., 1995, 'Droplet-Wall Collisions : Experimental Studies of the Deformation and Breakup Process,' Int. J. Multiphase Flow, Vol. 21, pp. 151-173 https://doi.org/10.1016/0301-9322(94)00069-V
  12. Mundo, C, Sommerfeld, M. and Tropea, C., 1998, 'On the Modeling of Liquid Sprays Impinging on Surfaces,' Atomization and Sprays, Vol. 8, pp. 625-652
  13. Naber, J. D. and Farrell, P., 1993, 'Hydrodynamics of Droplet Impingement on a Heated Surface,' SAE930919
  14. Naber, J. D. and Reitz, R. D., 1988, 'Modeling Engine Spray/Wall Impingement,' SAE880107
  15. O'Rourke, P. J., 1981, Collective Drop Effects on Vaporizing Liquid Sprays, Ph. D Thesis of Princeton Univ
  16. Park, K., 1994, Development of a Non-Orthogonal- Grid Computer Code for the Optimization of Direct-Injection Diesel Engine Combustion Chamber Shapes, Ph. D. Thesis, UMIST, UK
  17. Reitz, R. D., 1987, 'Modeling Atomization Processes in High-Pressure Vaporizing Sprays,' Atomization and Spray Technology, Vol. 3, pp. 309-337
  18. Reitz, R. D. and Diwakar, R., 1987, 'Structure of High-Pressure Fuel Sprays,' SAE870598
  19. Reynolds, W. C., 1980, Modeling of Fluid Motions in Engines-an Introductory Overview, in Combustion Modeling in Reciprocating Engines, ed. J. N. Mattavi and C. A. Amann, Plenum Press, NY
  20. Saito, A., Kawamura, K., Watanabe, S., Takahashi, T. and Tuzuki, N., 1993, 'Analysis of Impinging Spray Characteristics under High-Pressure Fuel Injection (1st Report, Measurements of Impinging Spray Characteristics),' Trans. of Jap. Soc. Mech. Engg., Part. B, Vol. 59, pp. 3290-3295
  21. Senda, J., Kanda, T., Al-Roub, M., Farrell, P. V., Fukami, T. and Fujimoto, H., 1997, 'Modeling Spray Impingement Considering Fuel Film Formation on the Wall,' SAE970047
  22. Stanton, D. W. and Rutland, C. J., 1996, 'Modeling Fuel Film Formation and Wall Interaction in Diesel Engines,' SAE960628
  23. Watkins, A. P. and Wang, D. M., 1990, 'A New Model for Diesel Spray Impaction on Walls and Comparison with Experiment,' COMODIA 90 Proceedings of International Symposium on Diagnostics and Modeling of Combustion in Internal Combustion Engines, pp. 243-248, Kyoto, Japan
  24. Wachters, L. H. J and Westerling, N. A. J., 1966, 'The Heat Transfer From a Hot Wall to Impinging Water Drops in a Spherical State,' Chem. Eng. Sci., Vol. 21, pp. 1047-1056 https://doi.org/10.1016/0009-2509(66)85100-X
  25. Yarin, A. L. and Weiss, D. A., 1995, 'Impact of Drops on Solid Surfaces: Self-Similar Capillary Waves, and Splashing as a New Type of Kinematic Discontinuity,' J. Fluid Mech., Vol. 283, pp. 141-173 https://doi.org/10.1017/S0022112095002266