Effects of Injection Conditions and Oxygen Mole Fraction on Ignition Process of a Fuel Spray

Abstract

In order to clarify the effects of injection conditions and oxygen mole fraction on ignition delays in fuel sprays, and experimental study was conducted by using a constant volume vessel. Ignition delays were obtained at various ambient temperatures, pressures and oxygen mole fraction in n-heptane sprays. The results show that the hot-flame delay increases with the decrease in oxygen mole fraction. The hot-flame delay increases with the decreasing nozzle orifice diameter at a low oxygen mole fraction and a low ambient pressure.