A Transient Spray Mixing Model for Diesel Combustion

A transient spray mixing model forming the basis of heterogeneous combustion in direct injection diesel engines is described. Experimental growth results of transient fuel sprays in a high pressure, high temperature chamber form the basis of spray equations. Use of similarity of concentration profile yields a complete distribution. description Fuel of spatial and and air across the spray in conjunction with spray geometry and mass conservation temporal fuel-air preparation entrainment rates are calculated from the history of fuel-air distribution. Progressive evolution of combustion zones is determined by the fuel-air mixing process. Energy conservation and chemical kinetics calculations in each zone yield cylinder pressure and local nitric oxide concentration. The role of fuel-air mixing in diesel combustion is discussed. The model results are compared with experimental data.