Research on Effects of Double-layers Arrangement of Nozzles on Fuel-gas Mixing and Combustion in Cylinder

Based on the YD4A75-C3 electronically controlled common rail diesel engine, combined with the theory of Bosch forth total axial variable nozzles common rail fuel injection system, a research was made on the double-layers arrangement of nozzles’ the influence on the fuel-gas mixing and combustion process in cylinder by using commercial CFD software FIRE. The research result showed properly using double-layers arrangement of nozzles could enlarge fuel's diffusion space; improve fuel-air mixing quality, making combustion more sufficiently. As a result, the NO emissions increased while Soot decreased obviously.