RT Journal Article ID 5e9920520a7893e3 A1 Li, Haihang A1 Yao, Wei A1 Li, Pan A1 Zhou, Zhihui A1 Wang, Jian T1 INFLUENCE OF HIGH ALTITUDE ON COMBUSTION EFFICIENCY AND RADIATION FRACTION OF HYDROCARBON FIRES JF Heat Transfer Research JO HTR YR 2017 FD 2017-10-03 VO 48 IS 10 SP 865 OP 875 K1 hydrocarbon fire K1 heat release rate K1 combustion efficiency K1 radiation fraction K1 transmittance AB Fire behaviors of three gaseous hydrocarbon fuels were experimentally measured and compared at two different altitudes (Lhasa city, 64 kPa at an altitude of 3650 m; Hefei city, 100 kPa at an altitude of 50 m). The heat release rates were calculated through a simplified thermochemistry based on the measured concentrations of O2 and CO2 in the exhaust duct, then the combustion efficiencies and the radiation fractions were compared at the two altitudes. The heat release rates and combustion efficiencies were higher at lower pressure, and the overall temperatures of methane fires rose at a lower pressure. The radiative heat fluxes and radiation fractions at a low pressure were smaller than those at a normal pressure, while the smoke transmittances of acetylene fi res at a low pressure were higher. PB Begell House LK https://www.dl.begellhouse.com/journals/46784ef93dddff27,3a9e854d3cfd6b85,5e9920520a7893e3.html