Diffusion combustion is widely used in conventional diesel engines, and heat release rate and formation of harmful substances are determined by the mixing characteristics of diesel spray.
Both fuel atomization and spray characteristics are keys to improving diesel combustion and emission performance. In a combustion chamber with certain geometry, the process of fuel spray and mixing has a great impact on the combustion and emissions.
In a DI diesel engine, the centers of the combustion chamber and the injector are eccentric and the injector inclines gently. Therefore, in order to improve the fuel/air equivalence ratio distribution, it is important to analyze the effect of spray parameters such as spray angle, spray direction and number of spray holes suitable for the combustion chamber type.
In order to improve the quality of mixture, to boost combustion effects and to reduce the emission of exhaust gas, Hwang Kon, an institute head at the Faculty of Shipbuilding and Ocean Engineering, has analyzed the effect of spray angle in a reentrant combustion chamber and determined the best spray angle.
He simulated and investigated mixture formation and combustion processes at different spray angles in diesel engines by using AVL-FIRE code.
The main findings can be summarized as follows:
(a) Spray angle has a great influence on the fuel/air equivalence ratio in the combustion chamber and in-cylinder temperature distribution, and it also concerns the combustion process and emissions.
(b) The combustion performance parameters imply that increase in spray angle up to 160° is suitable and at that time emission is minimized.
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