A team of engineers from the University of Lincoln, with funding from the UK’s Engineering and Physical Sciences Research Council (EPSRC), has confirmed the feasibility of aircraft regenerate braking from the landing gear to provide power for taxiing to and from airport buildings, reducing the need to use jet engines.
The energy produced by a plane’s braking system during landing—currently wasted as heat produced by friction in the aircraft’s disc brakes—would be captured and converted into electricity by motor-generators built into the landing gear. The electricity would then be stored and supplied to the in-hub motors in the wheels of the plane when it needed to taxi.
Theoretically, an energy recovery system integrated into a plane’s landing gear might be able to provide all the power needed for taxiing from a runway back to the airport terminal. If at any time a limited amount of power was available, the plane could supplement this with its conventional engines. A plane would also need to run its jet engines prior to take-off, so an energy recovery system would probably only be used to meet a proportion of the plane’s energy needs during taxiing from the terminal to the runway.
The University of Lincoln’s research formed part of a project that aimed to assess the basic feasibility of as many ways of capturing energy from a landing aircraft as possible.
When an Airbus 320 lands, for example, a combination of its weight and speed gives it around three megawatts peak available power. We explored a wide variety of ways of harnessing that energy, such as generating electricity from the interaction between copper coils embedded in the runway and magnets attached to the underside of the aircraft, and then feeding the power produced into the local electricity grid.—Professor Paul Stewart, research leader
Most of the ideas weren’t technically feasible or simply wouldn’t be cost-effective. But the study showed that capturing energy direct from a plane’s landing gear and recycling it for the aircraft’s own use could work, particularly if integrated with new technologies emerging from current research related to the more-electric or all-electric aircraft.
A number of technical challenges would need to be overcome. For example, weight would be a key issue, so a way of minimizing the number of conductors and electronic power converters used in an on-board energy recovery system would need to be identified.
ACARE (the Advisory Council for Aeronautics Research in Europe) has made engine-less taxiing one of the key objectives beyond 2020 for the European aviation industry.
Taxiing is a highly fuel-inefficient part of any trip by plane with emissions and noise pollution caused by jet engines being a huge issue for airports all over the world.
If the next generation of aircraft that emerges over the next 15 to 20 years could incorporate this kind of technology, it would deliver enormous benefits, especially for people living near airports. Currently, commercial aircraft spend a lot of time on the ground with their noisy jet engines running. In the future this technology could significantly reduce the need to do that.—Professor Stewart
The project was carried out under the auspices of the EPSRC-funded Airport Energy Technologies Network (AETN) established in 2008 to undertake low-carbon research in the field of aviation, and was undertaken in collaboration with researchers at the University of Loughborough. The 12-month ”Feasibility Study of Energy Recovery from Landing Aircraft” received total EPSRC funding of £161,000 (US$256,000).
The initial projects associated with the EPSRC-funded Airport Energy Technologies Network (AETN) were the outputs of a Sandpit event in November 2009. Sandpits are intensive discussion forums where free thinking is encouraged in order to delve deep into specific issues and identify innovative solutions.