Oscillating Behavior of Fire-induced Exchange Flow through a Horizontal Ceiling Vent

Oscillating behaviors of fire-induced exchange flow through a horizontal ceiling vent in a compartment were studied in this paper. Experiments were conducted in a ceiling vent compartment with inner dimensions of 180.0 cm(L) × 120.0 cm(W) × 120.0 cm(H). A single vent configuration in the middle of the compartment ceiling was used. Various patterns of flow were shown by using the principle of smoke particles of laser scattering. The ratio of cross section of outflow and ceiling vent area and the oscillation frequency of outflow will then be obtained by image processing technology. Useful experimental results on these flow characteristics are derived which can be used for mass flow rate model establishment.