Research and Development Status and Prospect of the Alternative Energy Key Technologies for the Fixed-wing Civil Aircraft
The storage,transportation and transformation of the alternative energy are the bottlenecks and key technologies that restrict the development of the alternative energy fixed-wing civil aircraft.For example,the low mass energy density of the power batteries leads to the excessive weight of energy storage,which is the bottleneck of the development of the all-electric civil aircraft,and the low volume energy density of the hydrogen leads to the excessive volume of the energy storage and transportation difficulties,which are the bottlenecks of the development of the hydrogen civil aircraft.The application of the SAF fuel in civil aircraft is mainly restricted by the production cost of the SAF fuel.The main problem for the transformation from energy to propulsion,such as the all-electric propulsion,the hydrogen fuel cell propulsion and fuel-electric hybrid propulsion,is the development of high power density and high power motors,which can be partially solved by using distributed electric propulsion technology,but the mass and volume power density of the hydrogen fuel cells are still the main restrictions for its promotion and application in large aircraft.Using hydrogen as fuel for air-breath engines not only has technical problems of high-pressure or low-temperature fuel transportation and storage on aircraft,but also the special physical and chemical properties of the hydrogen fuel will bring special safety problems being different from the liquid hydrocarbon fuels.The comparison and induction for the application of the alternative energies in civil aircraft are presented,and the conclusion is that the SAF or green LNG fuels may be the most attractive choice for the civil aircraft compared with the direct using of the liquid hydrogen as aeronautical fuel.Or the green hydrogen must be used to synthesize SAF or LNG with the carbon dioxide from the atmosphere.And these can be the references or guidance for the alternative fueled civil aircraft.
mass energy densityvolume energy densitySAF fuelpower densitydistributed electric propulsion
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