辐射热流下定向刨花板热解自燃试验及数值模拟

In order to predict autoignition time of OSB exposed to radiant heat fluxes, firstly, milligram-scale thermogravimetric analysis (TGA) tests were conducted to parameterize the established pyrolysis model by model fitting method. Subsequently, gram-scale autoignition experiments, using seven predesigned constant heat fluxes, were implemented in a cone heating apparatus. Then, inversion model of OSB thermodynamic parameters was established by combining an improved numerical model and measured surface temperatures and mass loss rates to determine thermal conductivity and specific heat of OSB. The results show that the ignition time predicted by critical temperature and critical mass loss rate are 194, 116, 67, 47, 24, 16, and 129, 103, 59, 42, 27, 20 s respectively under six constant heat flows (28, 30, 35, 40, 45 and 50 kW/m²).