Fuel effects on illumination ignition delay and soot lift-off length in diesel combustion

Ignition behavior of different fuels is investigated by recording broadband soot luminosity at high speed (60 kHz).The tested fuels are regular low sulphur EN 590:2004 fuel, EN 14214:2003 (FAME), n-heptane and IDEA (2component surrogate fuel), all with a Cetane Index between 51 and 57. For this an optically accessible, high density,high temperature, constant volume cell is used. It appears that molecular structure of the fuels results in largedifferences in illumination ignition delay and soot lift-off length between the fuels tested