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Fuel ignition process is of importance in premixed diesel low-temperature  combustion strategies because longer ignition delay could provide more fuel  and air mixing time. Using blends of gasoline and diesel-like fuels might be  a possible way for the ignition delay extension. In this study, a rapid  compression machine is employed to investigate the characteristics of  premixed ignition processes of blends of n-heptane and commercial gasoline.  The proportion of gasoline in blended fuels and the compression ratio in this  rapid compression machine are varied to investigate the effects of fuel  component and compression ratio on ignition processes. It is found that  blended test fuels have two-stage increases in their cylinder pressure  traces, indicating that a low temperature heat release process exists before  the main combustion stage. Increased gasoline proportion in test fuels  reduces peak cylinder pressure and maximum pressure rise rates, while the  1st, 2nd and overall ignition delay are extended. Increased compression ratio  elevates the peak cylinder pressure, and shortens the 1st stage, 2nd stage  and overall ignition delays. The maximum pressure rising rates are also  increased with compression ratio, so when the low gasoline proportion test  fuels are used, knock combustion tends to occur at high compression ratio  conditions. However, as long as the gasoline proportion increases to a  sufficient level, knock combustion is avoided

Premixed ignition characteristics of blends of gasoline and diesel-like fuels on a rapid compression machine