Propane spill tests

Elsworth et al. (1983) report experiments performed in an open-topped channel 52 m long x 5 m high whose width was variable from 1 to 3 m. Experiments were performed with propane, both premixed as vapor and after a realistic spill of liquid within the channel. In some of the premixed combustion tests, baffles 1-2 m high were inserted into the bottom of the channel. Ignition of the propane-air mixtures revealed typical flame speeds of 4 m/s for the spill tests, and maximum flame speeds of 12.3 m/s in the premixed combustion tests. Pressure transducers recorded strong oscillations, but no quasi-static ovetpressure. 

Little experimental work has been conducted in the past to study the atmospheric dispersion behavior of a hydrogen gas cloud. The NASA series of seven LH2 spill tests demonstrated that the evolving H2 cloud was existent for a couple of 100 m downwind, especially if the ground was able to cool sufficiently. Also the completely different dispersion behavior of the light hydrogen and the heavy propane was shown. 

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