Dispersion and burning behavior of hydrogen released in a full-scale residential garage in the presence and absence of conventional automobiles

Experiments are described in which hydrogen was released at the center of the floor of a real-scale enclosure having dimensions of a typical two-car residential garage. Real-time hydrogen concentrations were monitored at a number of locations. The hydrogen/air mixtures were ignited at pre-determined local volume fractions ranging from 8% to 29%. The combustion behavior and structural effects were monitored using combinations of high-speed pressure transducers and ionization gauges, standard thermocouples, hydrogen sensors, and digital, infrared, and high-speed video cameras. Experiments were performed both for empty garages and garages with conventional automobiles parked above the hydrogen release location.

► Hydrogen dispersion was measured in a two-car garage with and without a vehicle.
► Hydrogen/air mixtures were ignited for volume percents between 6% and 29%.
► The combustion behavior was characterized using various flame properties.
► Garage and vehicle damage due to hydrogen burning were qualitatively characterized.