Abstract
Aircraft taxiing is conventionally performed using the main engines' inefficient idle thrust. Therefore, in line with greener aviation, the electrification of taxiing is the most viable option to reduce emissions, noise, and fossil fuel consumption during ground operations. This article studies the potential of hybridizing the conventional electric taxiing system, which is currently driven by the auxiliary power unit, with an electrical energy storage system, comprising commercial high-energy and high-power lithium-ion batteries, for the purpose of reducing fuel consumption. Hence, a power distribution optimization is formulated to minimize fuel consumption over a typical worst case taxi-out profile. Three different energy management strategies are presented for a narrow-body airplane. The optimization is performed for the selection of off-the-shelf batteries so that their impact on fuel savings can be evaluated in the early design stage. The study showed that a wide range of savings is achievable according to the selected strategy, the added weight allowance, and the battery characteristics. Considering a 180-kg added weight allowance and covering the three investigated strategies, up to 72% of taxiing fuel is saved.
Highlights
Unless the current scenarios change, the forecast increase in air travel will soon lead to higher levels of air pollutants
This paper studies the potential of hybridising the conventional electric taxiing system, which is currently driven by the Auxiliary Power Unit, with an electrical energy storage system, comprising commercial high-energy and high-power lithium-ion batteries, for the purpose of reducing fuel consumption
The fuel economy is compared to the conventional electric taxiing (CET) fuel consumption, i.e. 44.3 kg, due to the reason that CET is the highest level of technology readiness in taxiing electrification currently found and there is no similar hybrid ET benchmark reported in the available literature
Summary
Unless the current scenarios change, the forecast increase in air travel will soon lead to higher levels of air pollutants. Taxiing is defined as the flight phase in which the movement of an aircraft occurs on the surface of an aerodrome under its own power, i.e., using jet engines, excluding takeoff and landing. This definition will be referred to as conventional taxiing (CT) throughout the text [1]–[3]. In line with the more electric aircraft initiative, it is widely accepted in the aerospace community that electrification of taxiing procedure (i.e., electric taxiing (ET) solutions [10], [11]) is the most promising option for achieving emission-free ground movement. Despite the fact that ETS represent a deadweight during flight, on-board ETS are proven to have significant block-fuel savings (fuel for the whole flight mission) and, are the focus of this paper
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