The design considerations and computational fluid dynamics modeling of a high efficiency, low emissions, hydrogen-fueled engine for use as the prime mover of a series hybrid automobile is described. The series hybrid automobil uses the engine to generate electrical energy via a lightweight generator, the electrical energy is stored in a power peaking device (like a flywheel or ultracapacitor) and used as required to meet the tractive drive requirements (plus accessory loads) through an electrical motor. The engine/generator is stopped whenever the energy storage device is fully charged. Engine power output required was determined with a vehicle simulation code to be 15 to 20 kW steady state with peak output of 40 to 45 kW for hill climb. Combustion chamber and engine geometry were determined from a critical review of the hydrogen engine experiments in the literature combined with a simplified global engine model. Hydrogen's high effective octane number and high flame speed permits high compression ratio and very lean operation to simultaneously achieve high efficiency and low NOx emissions. The baseline design has dual-ignition, 15:1 compression ratio and operates in the 0.4 to 0.5 equivalence ratio range using homogeneous charge. The engine is currently envisioned as naturally aspirated with tuned intake and exhaust at the 15 to 20 kW level and supercharged to achieve the 40 to 45 kW power level. The engine is projected to operate in the 1800 to 3600 RPM range to minimize friction losses.
Progress toward an optimized hydrogen series hybrid engine
Entwicklung hin zu einem optimierten, serienreifen Wasserstoff-Hybridantrieb
1995
9 Seiten, 10 Bilder, 1 Tabelle, 19 Quellen
Aufsatz (Konferenz)
Englisch
Series Hybrid Vehicles and Optimized Hydrogen Engine Design
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