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4.2.7 Comparison of Parameters Table 4.8 Comparison of aircraft parameters 45 Parameter Wing surface area (𝑚 ) Maximum take-off mass (𝑘𝑔) Operating empty mass (𝑘𝑔) Wing loading (𝑘𝑔⁄𝑚 ) Cruise Altitude (𝑓𝑡) A320 aircraft value 122.4 73500 41244 600.49 38000 Redesigned aircraft value 112.4 72544 41244 645.2 29425 Deviation −8% − 9.5% 0% + 7.4% − 22% In Table 4.8, the values of all the important parameters of A320 aircraft is compared with the redesigned baseline aircraft. In most cases the deviation is less than 10 %, this shows that the aircraft design method is effective. The significant difference in cruise altitude can be caused due to the propeller driven aircraft PreSTo tool. The tool utilizes the relative power ratio which mainly depends on the statistical data of propeller driven engines. Since the cruise of propeller driven engines are lower than turbofan engines, the significant deviation can be jus- tified. By determining the parameters of a baseline aircraft, it is easier to compare the results. 4.3 Partial Turbo-Electric/Hydraulic Propulsion The Partial Turbo-electric/hydraulic propulsion concept is a combination of gas turbine and electric/hydraulic motors with propellers. In this research, in order to modify the configura- tion of the aircraft to partial turbo-electric/hydraulic propulsion, two additional motors with propellers are added. The motors are placed between the mid-wing section and wingtip. The motors are powered by the shaft off-take power extracted from the low-pressure turbine of the turbofan engine. The power extracted is transferred to the motor using similar method used in the completely turbo-electric/hydraulic propulsion concept. The crucial advantage for this concept is the increased fuel efficiency due to increase in effective engine by-pass ratio. This is an obvious advantage since, size of the engine core remains the same while the fan area in- creases drastically. The shaft power is extracted from the low-pressure turbine using the Accessory Gearbox. In commercial aircraft engines, this mechanical device is used to drive the hydraulic pumps, electric generators and compressors for air-conditioning. The fuel consumption required due to shaft power off-takes can be calculated by two methods analysed in Scholz (2014). This is presented in chapter 3.2.PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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