R-152a/air and R-134a/oxygen constant volume spherical flame burning velocity measurements
Robert R. Burrell, Gregory T. Linteris, Donald R. Burgess Jr., Michael J. Hegetschweiler, Jeffrey A. Manion, Valeri I. Babushok
Many presently used refrigerants are non-flammable but are being phased out due to concerns about their strong global warming potential (GWP). Replacements with low GWP exist but tend to be flammable with a maximum burning velocity in air between 1 cm/s and 25 cm/s. Flammable refrigerants are a rising challenge for industry which can benefit from predictive tools for ranking refrigerant flammability based on fundamentals. This work reports experimental burning velocities via pressure rise measurements in a constant volume spherical chamber interpreted with the aid of a thermodynamic spherical flame model. Flames of R-152a/air and R-134a/oxygen mixtures over a range of equivalence ratios provide experimental burning velocities for unburned gas pressures from 101 kPa to 304 kPa and temperatures from 298 K to 400 K. The work supports the development of validated and optimized kinetic models for the combustion of refrigerants at conditions relevant to fire safety.
11th US National Meeting of the Combustion Institute