The investigation of ignition delay times of t-fuel and u-fuel mixtures using shock tube with flame detection

Abstract

The ignition delay in a diesel engine is defined as the time interval between the start of injection and the start of combustion. One of the techniques used to study the delay times in combustion ignition engines is the simulation of the phenomena in shock tubes. The dependence of the ignition delay time of fuels, and especially between mixtures of different fuels can be systematically studied as a function of fuel composition, temperature, and pressure. In this work a series of shock-tube experiments were undertaken to determine the ignition delay times for different mixtures of fuels. The effects of blending T-fuel and U-fuel on the ignition delay time using shock tube with flame detection were studied. Different mixtures of T-fuel and U-fuel in concentrations of 25%, 45%, and 75%, in addition to pure T-fuel and U-fuel were used. The results showed that mixtures with higher concentrations of T-fuel have lower ignition delays. Additionally, it was observed that the time interval between the beginning of the shock wave and the detection of the flame time is higher in mixtures with a higher proportion of U-Fuel, since the ignition delay time is greater in fuels with lower cetane number.