International Journal of Automotive Technology

The Korean Society of Automotive Engineers (한국자동차공학회)
권호 표지

LARGE EDDY SIMULATIONS OF TUMBLE AND SWIRL FORMATIONS IN ENGINE IN-CYLINDER FLOW

  • Lee, B.S. (School of Mechanical & Aerospace Engineering, Seoul National University) ;
  • Lee, J.S. (School of Mechanical & Aerospace Engineering, Seoul National University)
  • Published : 2006.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

Swirl and tumble flows in an engine in-cylinder have been simulated by using a three-dimensional computational fluid dynamics code, and the results are validated in comparison with experimental data. The large eddy simulation based on the Smagorinsky model and the fractional step method is adopted to describe the turbulence of in-cylinder flows and to save computing time, respectively. The main purpose of this study is connected with the effect of various conditions of intake flows on formation and development of in-cylinder tumble and swirl motions. The engine speeds considered are 1000 rpm and 3000 rpm for intake flows with inclination angles between $-10^{\circ}$ and $20^{\circ}$ at deflection angles of $0^{\circ}$, $22.5^{\circ}$, and $30^{\circ}$. The results are discussed by visualizing flow fields and by evaluating parameters in relation to vortex intensity such as swirl and tumble ratios.

Keywords

References

  1. Choi, H. and Moin, P. (1994). Effects of the computational time step on numerical solutions of turbulent flow. J. Comp. Phys., 113, 1−4
  2. Germano, M., Piomelli, U., Moin, P. and Cabot, W. H. (1991). A dynamic subgrid-scale eddy viscosity model. Phys. Fluids A, 3, 1760−1765
  3. Gosman, A. D. (1986). Flow processes in cylinders. The Thermodynamics and Gas Dynamics of Internal Combustion Engine, II, edited by J. H. Horlock and D. E. Winterbone, Oxford University Press. New York
  4. Haworth, D. C. and Jansen, K. (2000). Large eddy simulation on unstructured deforming meshes: Towards reciprocating IC engines. Computers and Fluids, 29, 493−524 https://doi.org/10.1016/S0045-7930(99)00015-8
  5. Heywood, J. B. (1988). Internal Combustion Engine Fundamentals, Int. Edn., McGraw-Hill Inc. New York
  6. Kamura, H. and Takada, K. (1998). Development Incylinder gasoline direct injection engine. JSAE Review, 19, 175−180 https://doi.org/10.1016/S0389-4304(97)00072-6
  7. Morse, A. P., Whitelaw, J. H. and Ylanneskis, M. (1980). The flow characteristics of piston-cylinder assembly with an off-centre, open port. Proc. IMechE, 194, 291− 299
  8. Stone, R. (1992). Introduction to Internal Combustion Engines. 2nd Edn., The Macmillan Press Ltd. Londons
  9. Wakisaka, T., Shimamoto, Y. and Isshiki, Y. (1986). Three-dimensional analysis of in-cylinder flows in reciprocating engines. SAE Paper No. 860464