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Predicted Burning Velocities of C1 and C2 Hydrofluorocarbon Refrigerant Flames with Air

Published

Author(s)

Gregory T. Linteris, Valeri I. Babushok

Abstract

Due to their high global warming potentials, many existing working fluids for heating, cooling and refrigeration equipment will be phased out. Their replacements will be flammable or slightly flammable, and the burning velocity of refrigerant-air mixtures is being used as a metric to rank their flammability. To allow industry to estimate the flammability of new blends of agents, predictive tools for the burning velocity of refrigerants are being developed, and a kinetic mechanism is required. The NIST hydrofluorocarbon HFC mechanism was developed 20 years ago to describe hydrocarbon-air flames with added trace amounts of hydrofluorocarbon fire retardants (primarily CH2F2, CF3H, CF4, C2H2F4, C2HF5, and C2F6). The mechanism has been modified to include new HFC compounds, more recent rate data, and rate data for new species. The modified mechanism is used to predict steady, planar, 1D, unstretched burning velocities for mixtures of each refrigerant with air, over a range of fuel-air equivalence ratio ϕ, for comparison with the available experimental data. Agreement is good, and major kinetic pathways and the radical populations are explored to uncover the general reaction properties of these new flames.
Conference Dates
March 4-7, 2018
Conference Location
State College, PA, US
Conference Title
Spring Technical Meeting? Eastern States Section of the Combustion Institute

Keywords

Refrigerant flammability, Burning velocity, Low GWP refrigerants, C1-C2 HFCs

Citation

Linteris, G. and Babushok, V. (2018), Predicted Burning Velocities of C1 and C2 Hydrofluorocarbon Refrigerant Flames with Air, Spring Technical Meeting? Eastern States Section of the Combustion Institute, State College, PA, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925190 (Accessed April 21, 2024)
Created March 6, 2018, Updated April 11, 2022