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13 1 Introduction 1.1 Motivation Air travel plays a crucial role in today’s world. Every aircraft manufacturing company contin- uously try to improve their design and efficiency. Aviation regulators on the other hand tend to lay promising regulations for the future to cut down the carbon emissions and to promote a greener environment. Also, limitation of petroleum resources is a major driver for research in green energy. Besides emissions, the industry is also looking for ways to reduce the cost of air travel in order to encourage more people to fly. A hybrid propulsion system concept is being used in most of the vehicles today to cut down the same carbon emissions. Many OEMs have already started adapting the hybrid concept in aviation like the Airbus E-fan X. By combining the classic jet propulsion and electric propul- sion, one can achieve at least a few of the above-mentioned goals. Hydraulic propulsion systems are widely used in the Marine industry and are also the me- chanical back-bone of an aircraft. But a hydraulic propulsion system was never investigated for aviation purpose even though they have significant mass advantage over the electrical sys- tems. Among the three propulsion systems, the storage of aviation fuel is the best option in terms of specific power. In order to overcome this complication., a hybrid of elec- tric/hydraulic and jet propulsion can be determined to reduce the overall fuel consumption. For this reason, Prof. Scholz from the AERO group in Hamburg University of Applied Sci- ences wanted to evaluate the conventional propulsion system along with two new concepts. 1.2 Title Terminology The terms used in the thesis title are defined below. The definitions are defined according to Gunston (2009) unless specified. Aircraft Concept Jet Propulsion Propulsion Device designed to sustain itself in atmosphere above Earth’s surface, to which it may be attached by tether that offers no support. An idea or abstract principle (Crocker 2011). Aircraft propulsion by any propulsion system whose reaction is gener- ated by a jet, thus a turbofan, turbojet or ramjet. An act or instance of pushing or driving forward (Crocker 2011).PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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