Hydrogen-diesel dual-fuel direct-injection (H2DDI) combustion under compression-ignition engine conditions

This study investigates the ignition and combustion characteristics of interacting diesel-pilot hydrogen (H 2 ) jets under simulated compression-ignition engine conditions. Two converging single-hole injectors were used to inject H into an optically accessible constant-volume chamber (CVCC). The parameters varied include fuel injection sequence, timing between injections, ambient temperature (780–890 K). results indicate that when is injected before , with increasing time separation, burnt diesel products mix cool down, requiring longer jet-jet interaction ignite jet. When diesel-pilot, -air mixing amount prior pilot-fuel igniting impacts spreading through If jet occurs beyond its end-of-injection (EOI), mixture zone where pilot-diesel interacts becomes too lean for combustion. At lower temperatures, variability increases, attributed out.