Abstract
The dependence of the lower flammability limit on the initial temperature is studied experimentally and numerically for upward flame propagation at a pressure of 0.1 MPa. It is shown that the Burgess and Wheeler rule, implying a linear dependence of the lower flammability limit on the initial temperature with the intersection of the temperature axis at the point 1300°C, does not hold for N2, CH3OH, CH2O, and CH4. For these substances, the intersection of the temperature axis is at the point 900 ± 20°C. The Burgess and Wheeler rule gives overestimated values of the limit which do not reflect the true conditions of explosion safety.
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