JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Development of a numerical flow model for the multi-cylinder engine intake system
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Development of a numerical flow model for the multi-cylinder engine intake system
Song, Jae-Won; Seong, Nak-Won;
  PDF(new window)
 Abstract
To design an optimum engine intake system, a flow model for the intake manifold was developed by the finite difference method. The flow in the intake manifold was one-dimensional, and the finite difference equations were derived from governing equations of flow, continuity, momentum and energy. The thermodynamic properties of the cylinder were found by the first law of thermodynamics, and the boundary conditions were formulated using steady flow model. By comparing the calculated results with experimental data, the appropriate boundary conditions and convergence limits for the flow model were established. From this model, the optimum manifold lengths at different engine operating conditions were investigated. The optimum manifold length became shorter when the engine speeds were increased. The effect of intake valve timings on inlet air mass was also studied by this model. Advancing intake valve opening decreased inlet air mass slightly, and the optimum intake valve closing was found. The difference in inlet air mass between cylinders was very small in this engine.
 Keywords
Finite Difference Method;Volumetric Efficiency;Boundary Condition;Optimum Manifold Length;Pressure Wave;Branch Pipes;Valve Timing;
 Language
Korean
 Cited by
 References
1.
Internal Combustion Engine Fundamentals, 1988.

2.
기아자동차 중앙기술연구소, 1991.

3.
內燃機關(日本), 1971. vol.10. 108,

4.
내연기관, 1994.

5.
SAE Paper, 1982. vol.820407.

6.
Proc. Instn. Mech. E, 1982.

7.
1954. vol.1 & 2.

8.
The Thermodynamics and Gas Dynamics of Internal-Combustion Engines, 1982. vol.1.

9.
A Study of Gas Exchange Process Simulation of an Automotive Multi-Cylinder Internal Combustion Engine, 1982. 820410,

10.
Difference Methods for Inital Value Problems, 1967.

11.
Viscouss Fluid Flow, 1974. pp.262

12.
Computational Fluid Dynamics for Engineers, 1993. vol.1.

13.
A study on the Flow in the Engine Intake System, 1995. 952067,

14.
건국대학교 석사학위 논문, 1988.

15.
KIMM Technical Report, 1987.