The aim of the present work was to improve the study of wood self-extinguishment under cone calorimeter thanks to a dedicated experimental setup. A cone calorimeter was modified into a double sliding cone calorimeter in vertical orientation for studying samples extinguishment. With this new setup, the external heat flux can be quickly switched from a high to a low value seeking for the heat flux leading to the sample extinguishment. Samples were first submitted to different heat fluxes (60, 82.5 and 93.5 $kW.m^{-2}$) leading to auto-ignition. After different exposure times (6, 9, 15 and 18 min), the heat flux was suddenly reduced to a lower value (between 38.5 and 60 $kW.m^{-2}$) by sliding from one cone to the other one. All in all, 206 tests were performed varying heat fluxes and exposure time. This large number of test made it possible to carry out a statistic study and to deduce a critical Mass Loss rate and a critical heat flux for self-extinguishment. The critical heat flux for self-extinguishment varied from 44 to 51 $kW.m^{-2}$ depending on the heat flux that was used to ignite the sample. These critical heat fluxes were found weakly dependent on the time during which the sample was exposed to the high flux. Time-to-extinguishment was between 40 s and 100 s. Mass Loss Rate Per Unit Area (MLRPUA) for which self-extinguishment occur was found to be equal to 3.95 $g.m^{-2}{s}^{-1}$ and this value is almost independent on experiment parameters (exposure time and heat flux).

由于有专门的实验装置，本工作的目的是改进锥形量热仪下木材自熄性的研究。将锥形量热仪修改为垂直方向的双滑动锥形量热仪，以研究样品的熄灭。通过这种新设置，可以将外部热通量从高值快速切换到低值，以寻找导致样品熄灭的热通量。样品首先要经受不同的热通量（60、82.5和93.5$ķ\mathrm{w\; ^}。{米}^{-\mathrm{2个}}$）导致自动点火。经过不同的暴露时间（6、9、15和18分钟）后，热通量突然降低到一个较低的值（介于38.5和60之间）$ķ\mathrm{w\; ^}。{米}^{-\mathrm{2个}}$），从一个圆锥体滑到另一个圆锥体。总共进行了206次测试，这些测试通过改变热通量和暴露时间来进行。如此大量的测试使进行统计研究并推断出自熄的临界质量损失率和临界热通量成为可能。自熄的临界热通量从44到51不等$ķ\mathrm{w\; ^}。{米}^{-\mathrm{2个}}$取决于用来点燃样品的热通量。发现这些临界热通量几乎不依赖于样品暴露于高通量的时间。熄灭时间为40 s至100 s。发现发生自熄的单位面积质量损失率（MLRPUA）等于3.95$G。{米}^{-\mathrm{2个}}{s}^{-\mathrm{1个}}$ 并且该值几乎与实验参数（暴露时间和热通量）无关。