Effects of ambient pressure and nozzle diameter on ignition characteristics in diesel spray combustion

Numerical simulations are performed to investigate the effects of ambient density (ρam) and nozzle diameter (Dnoz) on ignition characteristic diesel spray combustion under engine-like conditions. A total nine cases which consist different ρam 14.8, 30.0, 58.5 kg/m3 Dnoz 100, 180, 363 μm considered. The results show that predicted delay times in good agreement with measurements. current mixture at central region becomes more fuel-rich as increases. This leads a shift high-temperature location from tip towards periphery increases 14.8 kg/m3. At higher 30.0 kg/m3, locations for all occur due shorter timing overly region. numerical first during occurs ρam⩽30.0 across Dnoz. ρam=58.5 fuel-lean 100 180 cases, but case. distinctive difference result is likely relatively longer time Furthermore, can be related local scalar dissipation rate large