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Kerosene based hydrocarbon fuels are preferred candidates for the source of energy due to its stable properties. Based on the requirement of the combustor and the growing concern over pollutant, kerosene based fuels are modified. The fuel under investigation is a modified form of kerosene with ultra-low sulphur content. The effect of temperature on modified kerosene is studied for viscosity, surface tension, specific heat, density and ignition delay. The time delay for ignition of gas-phase mixtures of modified kerosene/oxygen have been measured using a shock tube facility. The experiments are conducted in the temperature range of 1200–1877 K, pressure range of 4–12 atm and equivalence ratio of Ø = 1.5, 1 and 0.5. The ignition delay time measurements were carried out using piezoelectric pressure transducers, which records the pressure rise due to ignition and simultaneously recording the light emission during the process of ignition using a photodiode. The ignition delay is represented as τign = 0.168841 × P−1.49 × Ø0.72 × e(14310/T)

Shock tube facility in the Propulsion and High Enthalpy laboratory, Aerospace Engineering Department, has been extensively used to study the ignition characteristics of fuels by measuring the ignition delay times for various hydrocarbon fuels at high temperatures. Initially a systematic method has been followed to calibrate the shock tube for ignition delay time measurements by measuring the delay times of C2H6 - O2 gas mixture diluted with argon. The results show good agreement with earlier reported works of Ethane ignition. Ignition times of low molecular weight liquefied petroleum gas, a fuel used in many industrial and household applications has been studied in the temperature range of 1250-1880 K and in the pressure range of 6-11 atm at equivalence ratios (Φ = 0.5 & 1). The ignition delay was measured in the reflected shock region by recording the ignition-induced pressure rise and emission from CH radical simultaneously. From the present study it is noted that the ignition delay time for liquefied petroleum gas reduces with increase in temperature and its activation energy lies in the range of 40 kcal/mol.

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