The backdraft in an underground mine tunnel fire is investigated by means of experimental simulation. According to the results, such a backdraft phenomenon is different from a general one in a compartment fire. A backdraft of tunnel fire takes place in an open system with flowing gases and no newly formed vents are needed to result in it under such an occasion. The backdraft occurs with the reversal of descensionally ventilated airflow. The results obtained extend the range where a backdraft can occur and promote a better understanding of the backdraft phenomenon.
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