COMPARATIVE EVALUATION OF THE RE-ENTRANT AND FLAT TOROIDAL COMBUSTION CHAMBERS IN A DIRECT-INJECTION DIESEL ENGINE USING COMPUTATIONAL FLUID DYNAMICS

A parametric study of the effect of piston bowl configuration on air motion of a direct injection diesel engine motored at 3000 rpm is investigated. Two piston bowl configurations (Mexican-hat and Re-entrant) are modeled for the computational flow analysis. The flow characteristics of these engine bowls are examined under transient conditions using STAR CD, a commercial computational fluid dynamics package. The predicted computational fluid dynamics results of mean swirl velocity of the engine at different locations inside the combustion chamber, at the end of compression stroke were compared with experimental results available in the literature. The results obtained showed very good agreement with the measured data given in the literature. This paper discusses the predicted flow structure inside the combustion chamber at top dead center, with different piston bowl shapes at 3000 rpm. It also compares the radial distribution of mean swirl velocity component in the piston bowl for the two cases. It is observed that the Re-entrant bowl provides a higher swirl ratio at almost all locations than the Mexican hat bowl.

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Optimization of a high-speed direct-injection diesel engine at low-load operation using computational fluid dynamics with detailed chemistry and a multi-objective genetic algorithm

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/09544070jauto1351 ◽

2010 ◽

Vol 224 (4) ◽

pp. 547-563 ◽

Cited By ~ 10

Author(s):

H-W Ge ◽

Y Shi ◽

R D Reitz ◽

W Willems

Keyword(s):

Fluid Dynamics ◽

Genetic Algorithm ◽

Computational Fluid Dynamics ◽

Diesel Engine ◽

High Speed ◽

Direct Injection ◽

Detailed Chemistry ◽

Direct Injection Diesel Engine ◽

Multi Objective Genetic Algorithm ◽

Low Load

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Modelling of Spray–Swirl Interaction in Direct Injection Diesel Engine Combustion Chambers

Proceedings of the Institution of Mechanical Engineers Part D Transport Engineering ◽

10.1243/pime_proc_1985_199_156_01 ◽

1985 ◽

Vol 199 (3) ◽

pp. 187-198 ◽

Cited By ~ 5

Author(s):

P S Mehta ◽

A K Gupta

Keyword(s):

Diesel Engine ◽

Fuel Injection ◽

Direct Injection ◽

Three Dimensional ◽

Combustion Chambers ◽

Direct Injection Diesel Engine ◽

Wide Range ◽

Engine Combustion ◽

Computation Scheme ◽

Good Agreement

A mathematical model for predicting spray–swirl interaction in a direct injection diesel engine combustion chamber is developed using centre-line velocity vector/continuum approach. The model has three-dimensional features in fuel spray motion. The present model responds to the various air swirl, fuel injection and cylinder charge conditions. The predicted results are compared with the analytical and experimental data available from various sources in the two-dimensional case. Very good agreement is achieved over a wide range of data. The three-dimensional predictions are directly possible without any alteration in the computation scheme.

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