In order to control the heat-release rate at homogeneous charge compression ignition (HCCI) operation. the feasibility of spark-assisted compression ignition (SI-CI) combustion was demonstrated with lean mixture of primary reference fuel (PRF) and hydrogen. In this study. the criteria at octane number and hydrogen ratio were investigated using a rapid compression/expansion machine for... https://www.roneverhart.com/HP-Notebook-15-da0008ca-HD-LED-15-6-Touchscreen-Intel-Core-i5-8250U-1-6-GHz-8-GB-RAM-1-TB-SSD-HDMI-USB-Multi-format-S/