An experimental investigation of an inertization effectiveness of fluorinated hydrocarbons in relation to premixed H2–N2O and CH4–N2O flames

Abstract An experimental investigation of an influence of trifluoromethane CHF 3, pentafluoroethane C 2 HF 5 and perfluorobutane C 4 F 10 on near-limit hydrogen-nitrous oxide and methane-nitrous oxide premixed flames was performed. Flammability limits, a maximum explosion pressure Δ P max , maximum rate of pressure rise ( dP / dt ) max , and a laminar burning velocity S u were determined. The flammability area in the case of N 2 O as an oxidizer is substantially wider than for the case of the oxidizer which is the mixture of oxygen and nitrogen with the O 2 content 25% (vol.). The dependences of S u , Δ P max and ( dP / dt ) max on concentration of the fluorinated hydrocarbons are characterizing by an availability of maxima which positions are close to the peak concentrations of the flammability regions. A qualitative interpretation of the results obtained is given.