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原文传递 Progress toward an optimized hydrogen series hybrid engine

题名：	Progress toward an optimized hydrogen series hybrid engine
作者：	Amsden, A.A.;Johnson, N.L.;Aceves, S.M.;Smith, J.R.;
关键词：	33 ADVANCED PROPULSION SYSTEMS; HYBRID ELECTRIC-POWERED VEHICLES; INTERNAL COMBUSTION ENGINES; DESIGN; HYDROGEN FUELS; AUTOMOTIVE FUELS; FUEL SUBSTITUTION; ELECTRIC GENERATORS; ENERGY STORAGE; MATHEMATICAL MODELS; NITROGEN OXIDES; THEORETICAL DATA; COMPUTERIZED SIMULATION
摘要：	The design considerations and computational fluid dynamics (CFD) 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 automobile 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. Two different engine models are employed to guide engine design. The models are a simplified global engine performance model that relies strongly on correlations with literature data for heat transfer and friction losses, and a state-of-the-art CFD combustion model, KIVA-3, to elucidate fluid mechanics and combustion details through full three-dimensional modeling. Both intake and exhaust processes as well as hydrogen combustion chemistry and thermal NO{sub x} production are simulated. Ultimately, a comparison between the simulation and experimental results will lead to improved modeling and will give guidance to changes required in the next generation engine to achieve the goal of 45%brake thermal efficiency.
总页数：	11p
报告类型：	科技报告