Numerical and Experimental Analysis of Spray Atomization Characteristics of a GDI Injector

  • Park, Sung-Wook (Department of Mechanical Engineering, Hanyang University) ;
  • Kim, Hyung-Jun (Department of Mechanical Engineering, Hanyang University) ;
  • Lee, Chang-Sik (Department of Mechanical Engineering, Hanyang University)
  • Published : 2003.03.01


In this study, numerical and experimental analysis on the spray atomization characteristics of a GDI injector is performed. For numerical approach, four hybrid models that are composed of primary and secondary breakup model are considered. Concerning the primary breakup, a conical sheet disintegration model and LISA model are used. The secondary breakup models are made based on the DDB model and RT model. The global spray behavior is also visualized by the shadowgraph technique and local Sauter mean diameter and axial mean velocity are measured by using phase Doppler particle analyzer Based on the comparison of numerical and experimental results, it is shown that good agreement is obtained in terms of spray developing process and spray tip penetration at the all hybrid models. However, the hybrid breakup models show different prediction of accuracy in the cases of local SMD and the spatial distribution of breakup.



  1. Bellman, R., Pennington, R. H., 1954, 'Effects of Surface Tension and Viscosity on Taylor Instability,' Quarterly of Applied Mechanics, Vol. 12, pp. 151-162
  2. Dombrowski, N. and Johns, W. R., 1963, 'The Aerodynamic Instability and Disintegration of Viscous Liquid Sheets,' Chem. Eng. Sci., Vol. 18, pp. 203-214
  3. Fraser, R. P., Eisenklam, P., Dombrowski, N. and Hasson, D., 1962, 'Drop Formation from Rapidly Moving Sheets,' AICHE. J., Vol. 8, No. 5, pp. 672-680
  4. Hwang, S. S., Liu, Z. and Reitz, R. D., 1996, 'Breakup Mechanisms and Drag Coefficients of High-speed Vaporizing Liquid Drops,' Atomization and Sprays, Vol. 6, pp. 353-376
  5. Ibrahim, E. A., Yang, H. Q. and Prezkwas, A. J., 1993, 'Modeling of Spray Droplets Deformation and Breakup,' AIAA J. Propulsion and Power, Vol. 9, No. 4, pp. 652-654
  6. Iyer, C. O. and Han, Z., 2002, 'Fuel Spray Modeling of Outward-Opening Pintle Injectors,' ILASS Americas, 15th Annual Conference on Liquid Atomization and Spray System, Madison, WI
  7. Kim, J. I., No, S. Y. and Lim, J. H., 1999, 'Modeling Capability of Various Atomization and Droplet Breakup Models for DI Diesel Engines,' The eighth Symposium (ILASS-Japan) on Atomization, Osaka, Japan, pp. 149-154
  8. Lee, C. S., Lee, K. H., Chon, M. S. and Kim, D. S., 2001, 'Spray Structure and Characteristics of High-pressure Gasoline Injectors for Direct-injection Engine Applications,' Atomization and Sprays, Vol. 11, pp. 35-48
  9. O'Rourke, P. J. and Amsden, A. A., 1987, 'The Tab Method for Numerical Calculation of Spray Droplet Breakup,' SAE paper 872089
  10. Park, S. W., Sung, K. A. and Lee, C. S., 2001, 'Macroscopic Behavior and Spray Characteristics of Gasoline Injector in a Direct-injection Gasoline Engine,' The Eleventh International Pacific Conference on Automotive Engineering (IPC-11), IPC2001D071
  11. Reitz, R. D., 1987, 'Modeling Atomization Processes in High-pressure Vaporizing Sprays,' Atomisation and Spray Technology, Vol. 3, pp. 309-337
  12. Schmidt, D. P., Nouar, I., Senecal, P. K., Rutland, C. J., Martin, J. K., Reitz, R. D. and Hoffman, J. A., 1999, 'Pressure-swirl Atomization in the Near Field,' SAE paper 1999-01-0496
  13. York, J. L., Stubbs, H. F. and Tek, M. R., 1953, 'The Mechanism of Disintegration of Liquid Sheets,' Trans. ASME, Vol. 75, pp. 1279-1286
  14. Zhao, F. Q., Lai, M. C. and Harrington, D. L., 1995, 'The Spray Characteristics of Automotive Port Fuel Injection-A critical review,' SAE paper 950506