A Computational Study of Multiple Injection Strategies in Compression Ignition Engines at High Pressure

摘要

Higher efficiency can be achieved by heat release control in order to get more ideal combustion and so extraction of maximum possible work. Concepts of multiple injectors are expected to increase the ability to control the heat release as well as decrease interference between the sprays. Computational Fluid Dynamics (CFD) studies on a Volvo D13 with altered compression ratio have been performed with n-heptane as fuel. The computations were used to derive methods that lead to constant pressure combustion utilizing three injectors with split injection strategies. Also the chemical mechanism used was validated, through Chemkin simulations, for the high pressure. Promising CFD results with high pressures and control over the heat release were obtained. Isobaric combustion was achieved at pressures of up to 300 bar.