TY - JOUR

T1 - Numerical investigation into effect of fuel injection timing on CAI/HCCI combustion in a four-stroke GDI engine

AU - Cao, Li

AU - Zhao, Hua

AU - Jiang, Xi

AU - Kalian, Navin

PY - 2006

Y1 - 2006

N2 - The Controlled Auto-Ignition (CAI) combustion, also known as Homogeneous Charge Compression Ignition (HCCI), was achieved by trapping residuals with early exhaust valve closure in conjunction with direct injection. Multi-cycle 3D engine simulations have been carried out for parametric study on four different injection timings in order to better understand the effects of injection timings on in-cylinder mixing and CAI combustion. The full engine cycle simulation including complete gas exchange and combustion processes was carried out over several cycles in order to obtain the stable cycle for analysis. The combustion models used in the present study are the Shell auto-ignition model and the characteristic-time combustion model, which were modified to take the high level of EGR into consideration. A liquid sheet breakup spray model was used for the droplet breakup processes. The analyses show that the injection timing plays an important role in affecting the in-cylinder air/fuel mixing and mixture temperature, which in turn affects the CAI combustion and engine performance.

AB - The Controlled Auto-Ignition (CAI) combustion, also known as Homogeneous Charge Compression Ignition (HCCI), was achieved by trapping residuals with early exhaust valve closure in conjunction with direct injection. Multi-cycle 3D engine simulations have been carried out for parametric study on four different injection timings in order to better understand the effects of injection timings on in-cylinder mixing and CAI combustion. The full engine cycle simulation including complete gas exchange and combustion processes was carried out over several cycles in order to obtain the stable cycle for analysis. The combustion models used in the present study are the Shell auto-ignition model and the characteristic-time combustion model, which were modified to take the high level of EGR into consideration. A liquid sheet breakup spray model was used for the droplet breakup processes. The analyses show that the injection timing plays an important role in affecting the in-cylinder air/fuel mixing and mixture temperature, which in turn affects the CAI combustion and engine performance.

KW - Controlled Auto-Ignition (CAI)

KW - HCCI

KW - Injection Timing

U2 - 10.1080/155022891009909

DO - 10.1080/155022891009909

M3 - Journal article

VL - 7

SP - 41

EP - 57

JO - International Journal of Computational Methods in Engineering Science and Mechanics

JF - International Journal of Computational Methods in Engineering Science and Mechanics

SN - 1550-2295

IS - 1

ER -