坑道限制条件下水平丙烷喷射火火焰行为研究

A small-scale experimental device of jet fire in a pit was built, and experimental simulation was conducted to study the flame characteristics of horizontal propane jet fire caused by the leakage of pipeline buried underground. The flame is restricted by the side wall of the pit, first hits the tunnel and then develops upward along the side wall to form a vertical flame. The experimental results show that the flame length first increases and then decreases as the leakage mass flow rate increases, while the flame width continuously increases. In addition, vortex pairs, indicated by a pair of counter-rotating flames, were observed to appear on both lateral sides of the flame under critical conditions. In order to explore the formation mechanism of vortex pairs, the instability of flame flow field is further studied by numerical simulation.