On the Reverse Flow Ceiling Jet in Pool Fire-Ventilation Crossflow Interactions in a Simulated Aircraft Cabin Interior

The behavior of the reverse flow ceiling jet against the ventilation flow from 0.58 to 0.87 m/s was investigated in a 1/3 scale model of a wide body aircraft interior. For all tests, strong reverse flow ceiling jets of hot gases were detected well upstream of the fire. The penetration lengths of the reverse flow ceiling jet for the tests agree fairly well with the relation, l_r/H = 0.6 [$F$−5] where $F$ is the fire-crossflow parameter, $F$ = 2gHQ˙/ρcT_sAu_a³. Both the thicknesses of the reverse flow ceiling jet and the smoke layer increased with the fire-crossflow parameter. The thickness of the smoke layer where the smoke flows along the main flow below the reverse flow ceiling jet was almost twice that of the reverse flow ceiling jet. Detailed spatial and time-varying temperatures of the gas in the test section were measured and velocity profiles were also measured using a temperature-compensated hot film.