Three-dimensional Simulation and Experiment in a high-speed direct-injection diesel engine based on KIVA-3V Code

摘要

To simulate exactly the three-dimensional turbulent combustion temperature field in Direct-Injection (DI) diesel engine the structure of KIVA-3V code is performed. Instead of dealing with all the elementary reactions, one single overall reaction is considered to calculate ignition and extinction, which reduces computational cost. Since the shape of 4JB1 piston is not on the axis of symmetry, 360° grid computing was modeled which corresponds x-offset 4mm and y-offset 1 mm. Besides, schematic of the test bench configuration and engine specification are showed and the measured injection rate profiles corresponding to rail pressures of 600 bar, 800 bar, and 1000 bar are drawn as an important input for the simulation. Finally, cylinder pressures and the corresponding heat release rates with variation of injection timing are compared with experimental data. Spatial temperature distribution pictures at different crank angle are analyzed. It gives the new theory and method to understand the turbulent diffusion combustion temperature field in DI diesel engine.