Laminar Burning Speed of 1,1-Difluoroethane (R152a)/Air Mixtures

摘要

Laminar burning speed and flame structure of 1,1-difluroethane (HFC-152a)/air mixtures have been studied. Experiments have been carried out in constant volume vessel coupled with a Schlieren/shadowgraph system and CMOS high speed camera capable of taking flame snapshots up to 40,000 frames per second. Laminar burning speed was determined using a thermodynamic model that employs the pressure rise history of the combustion process. Experiments were conducted for ambient initial conditions over a wide range of equivalence ratios. Laminar burning speed of HFC-152a/air mixtures has been measured for temperature range of 298 to 400 K and pressure range of 1.0 to 4.0 atm. The presence of hydrofluoric acid in the products of combustion was observed along with its effects on the experimental apparatus. The results of laminar burning speed have been compared with others in the literature.