... contained in the fuel, because soot generation within the flame might be increased with increasing the content of aromatics in the fuel. Fossil Fuel and the Environment 38 The knowledge ... between air and fuel mass flowrates, equation 2. The ratio between the actual AFR and the AFRstoich, is the relative air -fuel ratio, equation 3. If λ> 1 the mixture is lean and the oxidation ... of test fuels used in the diffusion combustion experiment Fossil Fuel and the Environment 14one of the aromatics, more naphtheno benzenes may be contained in the aromatic-rich fuel. It...