Numerical Study of Knocking Combustion in a Heavy-Duty Engine under Plateau Conditions

Diesel engine combustion becomes very rough and can lead even to deflagration under high altitude conditions, which is harmful component durability. In this study, the effects of on main characteristics—in-cylinder fluid flow, spray behavior, pressure temperature distribution—were analyzed with CFD. A numerical model was built CONVERGE platform validated optical behavior trace measured by test bench. The simulation results indicated that decreases in compression at 4.5 km led an over 4 °CA longer ignition delay than those 1 3 km. efficiency decreased from 90% 47% when changed normal knocking due severe impingement. processes end-gas ignition, sequential combustion, oscillation were revealed modeling results. These indicate super-knocking exists both spark-ignition (SI) engines compression-ignition (CI) engines.