Spectral analysis and chemiluminescence imaging of hydrogen addition to hsdi diesel combustion under conventional and low-temperature conditions

摘要: Late-injection low-temperature diesel combustion is found to further reduce NOx and soot simultaneously. The phenomena detail chemical kinetics are studied with high speed spray/combustion images time-resolved spectroscopy analysis in a rapid compression machine (RCM) small bowl chamber. High swirl EGR condition can be achieved the RCM; variable injection pressure timing supplied by high-pressure common-rail fuel system. Effect of amount premix hydrogen gas on also RCM. A injector located upstream air inlet for delivery premixed into cylinder just before stroke. ignition delay both from curves chemiluminescence images. color spray show not only sooting impinging chamber wall interacting very strong swirling air, but temperature volume fraction soot. Hydrogen addition 10% energy released low shown reduced concentration, at 15% shows higher concentration. Small does results increasing peak fast burning rate because up 50%. Time resolved spectrum cool flame, combustion, diffusion flame mainly time evolution OH radicals. With released, detected easily started period till early period. However, intensity emission sensitive concentration equivalence ratio due changes oxygen Temperature derivation rotational spectral lines employed cases emission.