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This work investigated the gas clouds produced by leakage from a hydrogen pipeline compared to those of a natural gas pipeline. The growth of the gas clouds was predicted with a computer model (FLUENT) and verified with a full scale model leaking 1415 I/min (50 SCFM) of hydrogen or 425 I/min (15 SCFM) of methane. Those leakage flowrates correspond to equivalent energy delivery rates in the pipelines. The risks involved in leaking hydrogen compared to natural gas was assessed in terms of the likelihood of ignition (size of the combustible cloud) and severity of combustion (energy content of the combustible cloud).

Abnormal combustion in methanol fueled engines was investigated using a combination of ion gap detection and pressure versus crankangle measurements. The ability to differentiate between cool flames and surface ignition is shown. It is shown that cool flames do exist in methanol fueled engines. It is additionally shown that they can occur before the spark plug fires producing cycle to cycle variations in the chemistry of the gases present in the spark plug gap. An analysis of the effect of surface temperature, at the time of deposit formation, on deposit induced surface ignition tendency was made.