Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion

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Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion ( comparison-concepts-classic-jet-propulsion-turbo-electric-pr )

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56 5 Results The results from the aircraft of all the concepts mentioned in chapter 4 are presented here. In both the tools i.e. PreSTo for propeller and turbofan engine driven aircraft, a baseline aircraft was created similar to A320. Using the baseline aircraft in both cases, the results are normal- ized in order to compare them with A320. In the following section, results from different types of turbo-electric/hydraulic propulsion systems are reviewed. A total of 8 configurations are analysed. The following nomenclature is used to classify aircraft configurations : the first two letter indicate the type of gas turbine engine used (turboshaft (TS) or turboprop (TP)), the third and fourth letter describe the type of propulsion architecture used (turbo-electric (TE) or turbo-hydraulic (TH)) and number presents the number of propulsors used. 5.1 Turbo-Electric/Hydraulic Propulsion System 5.1.1 Mass Breakdown of Propulsion System 48% 22% 16% Piping Hydraulic pump Hydraulic Motor Gas Turbine Engine 14% Figure 5.1 Mass breakdown of turbo-hydraulic propulsion system Figure 5.1 shows the breakdown in mass of the turbo-hydraulic propulsion system. The gas turbine engine occupies majority of the pie since it produces the majority power required and it also compensates for the inefficiencies of the overall system. The piping for the hydraulic fluid is heavy because it includes the mass of the fluid, pressure line pipe and return line pipe. Also, the many of the small components such as valves and filters are not taken into account.

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