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Flame Propagation in Blends of R152a, R134a, and R-1234yf with Air



Dennis Kim, Valeri I. Babushok, Michael Hegetschweiler, Gregory T. Linteris


Laminar burning velocity measurements have been made using a constant volume experiment with dry air and the refrigerant R152a (CH3CHF2), pure and blended with R134a (CH2FCF3), or R1234yf (CF3CFCH2). The resulting burning velocity data deduced from the pressure rise in the chamber are presented for a range of fuel air equivalence ratio and loading of the less flammable refrigerant, for unburned gases at 298 K and 101 kPa as well as at 375 K and 253 kPa. For comparison, the 1D, planar laminar burning velocity was numerically simulated using a recently developed kinetic mechanism that includes a wide range of refrigerants with air. The predicted burning velocities agree reasonably well with the experimental values, and the numerical results are used to understand the kinetic mechanism of the reaction of the refrigerants. Uncertainties in the experimental data from radiation heat losses as well as extrapolation to ambient conditions are explored.
Combustion Science and Technology


refrigerant flammability, R152a, R134a, R1234yf, laminar flame speed, burning velocity


Kim, D. , Babushok, V. , Hegetschweiler, M. and Linteris, G. (2023), Flame Propagation in Blends of R152a, R134a, and R-1234yf with Air, Combustion Science and Technology, [online],, (Accessed June 17, 2024)


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Created September 13, 2023, Updated September 26, 2023