Vehicle Electrification - May 13, 2014 - 31
PROPULSION FEaTURE
propulsive efficiency is to increase the bypass ratio beyond the values of 12 achieved
in some of today's high-bypass turbofan
engines. With distributed propulsion, values of "effective bypass ratios" of over 20
might be achievable. (The word "effective"
is used as the fan airstreams and core airstream are physically separated.) Incorporating a series of lower-power fans in the
airframe rather than in under-wing pods,
as in use today, will reduce noise and fuel
consumption significantly.
the distributed fan
propulsion system
In a productionized form, the distributed fan
propulsion system would replace the familiar conventional turbofan engines providing
thrust for all today's jet airliners. As the
power and thrust of the big fan engines
have steadily increased since their introduction in the early 1970s, so too has their size,
and the only practical location on a widebody jetliner today is pylon-mounted beneath the wings. Because of the large fan
nacelle diameter, this has meant that aircraft
weight has also increased due to the need
for strengthened wings and provision for
lengthy landing gear to obtain the necessary ground clearance.
Integrated electrically driven fans, on the
other hand, would greatly enhance aerodynamic efficiency and allow a more optimized
aircraft design. They would not require the
Vehicle Electrification
present heavy engine mounting structure,
saving weight and drag. During the descent
mode the distributed fans would be windmilling in the airstream but would still be
generating electrical energy that can be
stored. To arrive at a more optimized propulsion/airframe match, three innovative
components are required: a wake re-energizing fan, structural stator vanes that pass
electrical power and cryogenic coolant, and
a hub-mounted totally superconducting electrical machine.
All sorts of additional benefits might arise
through adopting a distributed propulsion
configuration on a future civil aircraft. As
well as the concept leading to a big reduction in structural weight, highly innovative
efficiency gains may become possible by reenergizing the momentum losses in the
boundary layers that build up over the wing
and fuselage, creating a wake. If this boundary layer can be ingested and re-accelerated
by the fans this could reduce the drag.
The concept uses advanced lightweight
composite fan blades that are designed to
maximize overall propulsive efficiency
while minimizing the weight of the propulsion system. This introduces big design
challenges as the resulting airflow into the
fans would not be uniform and the fan
blades would therefore have to
withstand the unsteady conditions resulting from distorted intake flow.
Rolls-Royce is working on this particular
May 13, 2014
31
Vehicle Electrification - May 13, 2014
Table of Contents for the Digital Edition of Vehicle Electrification - May 13, 2014
Vehicle Electrification - May 13, 2014
Contents
Editorial
Technology Report
Automotive
Off-Highway
Motorsports
Aerospace
Automotive
Into the Deap
Ad Index & Resource Links
Upcoming
Vehicle Electrification - May 13, 2014 - Vehicle Electrification - May 13, 2014
Vehicle Electrification - May 13, 2014 - 1
Vehicle Electrification - May 13, 2014 - Contents
Vehicle Electrification - May 13, 2014 - 3
Vehicle Electrification - May 13, 2014 - Editorial
Vehicle Electrification - May 13, 2014 - 5
Vehicle Electrification - May 13, 2014 - 6
Vehicle Electrification - May 13, 2014 - 7
Vehicle Electrification - May 13, 2014 - Automotive
Vehicle Electrification - May 13, 2014 - 9
Vehicle Electrification - May 13, 2014 - 10
Vehicle Electrification - May 13, 2014 - Off-Highway
Vehicle Electrification - May 13, 2014 - 12
Vehicle Electrification - May 13, 2014 - 13
Vehicle Electrification - May 13, 2014 - Motorsports
Vehicle Electrification - May 13, 2014 - 15
Vehicle Electrification - May 13, 2014 - 16
Vehicle Electrification - May 13, 2014 - Aerospace
Vehicle Electrification - May 13, 2014 - 18
Vehicle Electrification - May 13, 2014 - Automotive
Vehicle Electrification - May 13, 2014 - 20
Vehicle Electrification - May 13, 2014 - 21
Vehicle Electrification - May 13, 2014 - 22
Vehicle Electrification - May 13, 2014 - 23
Vehicle Electrification - May 13, 2014 - Into the Deap
Vehicle Electrification - May 13, 2014 - 25
Vehicle Electrification - May 13, 2014 - 26
Vehicle Electrification - May 13, 2014 - 27
Vehicle Electrification - May 13, 2014 - 28
Vehicle Electrification - May 13, 2014 - 29
Vehicle Electrification - May 13, 2014 - 30
Vehicle Electrification - May 13, 2014 - 31
Vehicle Electrification - May 13, 2014 - 32
Vehicle Electrification - May 13, 2014 - 33
Vehicle Electrification - May 13, 2014 - Upcoming
Vehicle Electrification - May 13, 2014 - 35
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https://www.nxtbook.com/nxtbooks/sae/10AEMD0127
https://www.nxtbook.com/nxtbooks/sae/10AEMD0120
https://www.nxtbook.com/nxtbooks/sae/10OFHD0114
https://www.nxtbook.com/nxtbooks/sae/10AEID0119
https://www.nxtbook.com/nxtbooks/sae/10AEMD0113
https://www.nxtbook.com/nxtbooks/sae/10AEID0105_v2
https://www.nxtbook.com/nxtbooks/sae/10AEID0105
https://www.nxtbook.com/nxtbooks/sae/09AEMD1223
https://www.nxtbook.com/nxtbooks/sae/09AEMD1209
https://www.nxtbook.com/nxtbooks/sae/AUTODEC09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1125
https://www.nxtbook.com/nxtbooks/sae/09AEMD1111
https://www.nxtbook.com/nxtbooks/sae/AUTONOV09
https://www.nxtbook.com/nxtbooks/sae/OFHNOV09
https://www.nxtbook.com/nxtbooks/sae/09AEMD1028
https://www.nxtbook.com/nxtbooks/sae/09AEMD1014
https://www.nxtbook.com/nxtbooks/sae/OFHOCT09
https://www.nxtbook.com/nxtbooks/sae/AUTOOCT09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0930
https://www.nxtbook.com/nxtbooks/sae/09AEMD0916
https://www.nxtbook.com/nxtbooks/sae/AUTOSEP09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0902
https://www.nxtbook.com/nxtbooks/sae/09AEMD0819
https://www.nxtbook.com/nxtbooks/sae/OFHAUG09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0805
https://www.nxtbook.com/nxtbooks/sae/AUTOAUG09
https://www.nxtbookmedia.com