Influence of Transport Processes on Autoignition of High Molecular Weight Hydrocarbon Fuels in Nonpremixed Flows

摘要

The objective of this research is to obtain an improved understanding of the influences of transport processes, chemical kinetics and flow characteristics on the mechanisms of autoignition of condensed (liquid) hydrocarbon fuels in nonpremixed, nonuniform flows. An experimental and numerical investigation is carried out. The condensed fuels tested are n- heptane and n-decane. Recent experimental investigation of autoignition of liquid hydrocarbon fuels, in particular n-heptane and n-decane, show that at low strain rate it is easier to ignite n-decane, while at high values of the strain rate it is easier to ignite n-heptane. Experiments were conducted employing the 'counterflow configuration'. Critical conditions of autoignition were measured. The mass fractions of fuel close to the liquid gas interface were measured. With increasing strain rate the mass fraction of n-heptane at the liquid-gas interface increases more rapidly than that of n-decane.