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Model Name NASA STARC-ABL (Welstead 2017) NASA N3-X (Felder 2011) Wright ECO-150R (Schiltgen 2016) Number of Passengers 154 300 150 Max. Power (MW) 2.6 50 12.7 Range (NM) 3500 7500 1650 20 The turbo-electric concept eliminates the need for a battery. In this case, the source of power generation and the propulsor are decoupled. By doing this, the speeds and inlet-to-outlet ratios are also decoupled. The benefit is extracted from high BPR, since many fans can be powered by one single turbine. This in turn improves the propulsive efficiency of the system. Since the fan and turbine are decoupled, the speed ratios can be set and varied during the operation. It also allows the fan to be placed at an optimum location in the aircraft since the transmission of power is electrical. The process of placing propulsors close to the body of the aircraft and reenergizing the boundary layer is known as Boundary Layer Ingestion (BLI). This helps in reducing the drag since the slow-moving flow is ingested, accelerated and exhausted. Figure 2.6 Bauhaus luftfahrt’s concept aircraft with aft propulsor (Warwick 2018) The Bauhaus luftfahrt’s aircraft in Figure 2.6 demonstrates the BLI with a propulsor in the aft of the aircraft. This third engine provides about 23% of the total thrust. This turbine engine ingests the airflow and reenergizes the momentum deficit that is caused by the profile drag and skin friction (Warwick 2018). Table 2.1 List of turboelectric aircraft with their requirements Table 2.1 contains the list of aircraft that are currently being researched to be launched in the next decades with turboelectric aircraft. The two NASA aircraft use the state-of-the-art super- conductive electric drives that is still under research. The concept is to use superconductive materials for motors, generators and cables that are almost 100% efficient and have high spe- cific power. The ECO-150R has teamed with the airline EasyJet to build a short-range small aircraft with conventional electric engines which is targeted to be enter service in 2035.PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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