Application of macrolamination technology to lean, premixed combustion

Macrolamination, a novel manufacturing technique, is used to develop a dual -fuel pre-mixer. A spatially distributed injection strategy is used to enha nce fuel placement. distribution, and mixing inside the premixer. Parametri c studies are conducted with different configurations of the premixer to de termine the effects of residence time and nozzle configuration on pollutant emissions and flame stability. Diesel fuel (DF-2) and natural.. gas are us ed as,fuels. Tests are conducted at a pressure of 400 kPa (5 atmospheres), and an inlet air temperature of 533 K. The pollutant emissions and RMS pres sure levels are presented for a relatively wide range of nozzle velocities (50-80 m/s) and equivalence ratios (0.54-0.75). These results indicate very good pollutant emissions for a prototype design. These results also indica te that the time-lag model, previously associated with combustion oscillati ons for gaseous-fuel applications, also applies to liquid-fuel operation.