Pagliaro, J.
and Linteris, G.
(2016),
Burning Velocities of Marginally Flammable Refrigerant-Air Mixtures, Proceedings of the 2016 Eastern States Section Meeting of the Combustion Institute, Princeton, NJ, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=920494
(Accessed October 31, 2024)
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Burning Velocities of Marginally Flammable Refrigerant-Air Mixtures
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Abstract
Refrigerant working fluids have been predicted to be large contributors to the increase in radiative forcing of the earth. Consequently, existing compounds will soon be phased out. Low-GWP replacements exist, but they tend to be mildly flammable, and there is a need to understand their flammability properties so that effective building codes and standards can be written to address their application. The burning velocities of interest are in the range of 1 cm/s to 10 cm/s, and hence are challenging to measure. To understand the challenges and properties of the new agents, experimental measurements and numerical predictions have been made for representative refrigerant-air mixtures. Burning velocities were measured using a constant pressure spherical chamber with high-speed imaging of the shadowgraph image of the propagating spherical flame. The flame propagation rate as a function of flame radius was used to estimate the effects of stretch, and to determine the un-stretched laminar burning velocity. For comparison, the burning velocity was also predicted numerically using a detailed kinetic mechanism for hydrofluorocarbon combustion developed at NIST.Proceedings Title
Proceedings of the 2016 Eastern States Section Meeting of the Combustion Institute
Conference Dates
March 13-16, 2016
Conference Location
Princeton, NJ, US
Conference Title
2016 Eastern States Section Meeting of the Combustion Institute
Pub Type
Conferences
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Keywords
Refrigerant flammability, R410A, R32, HFC-32, hydrofluorocarbon, burning velocity
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Created April 20, 2016, Updated October 12, 2021