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Related: About this forumNew Ideas Sharpen Focus for Greener Aircraft
(Please note: NASA releasecopyright concerns are nil.)
http://www.nasa.gov/topics/aeronautics/features/greener_aircraft.html
[font face=Times,Times New Roman,Serif][font size=5]New Ideas Sharpen Focus for Greener Aircraft[/font]
01.27.12
[font size=3]Leaner, greener flying machines for the year 2025 are on the drawing boards of three industry teams under contract to the NASA Aeronautics Research Mission Directorate's Environmentally Responsible Aviation Project.
Teams from The Boeing Company in Huntington Beach, Calif., Lockheed Martin in Palmdale, Calif., and Northrop Grumman in El Segundo, Calif., have spent the last year studying how to meet NASA goals to develop technology that would allow future aircraft to burn 50 percent less fuel than aircraft that entered service in 1998 (the baseline for the study), with 75 percent fewer harmful emissions; and to shrink the size of geographic areas affected by objectionable airport noise by 83 percent.
"The real challenge is we want to accomplish all these things simultaneously," said ERA project manager Fay Collier. "It's never been done before. We looked at some very difficult metrics and tried to push all those metrics down at the same time."
So NASA put that challenge to industry awarding a little less than $11 million to the three teams to assess what kinds of aircraft designs and technologies could help meet the goals. The companies have just given NASA their results.
"We'll be digesting the three studies and we'll be looking into what to do next," said Collier.
Boeing's advanced vehicle concept centers around the company's now familiar blended wing body design as seen in the sub-scale remotely piloted X-48, which has been wind tunnel tested at NASA's Langley Research Center and flown at NASA's Dryden Flight Research Center. One thing that makes this concept different from current airplanes is the placement of its Pratt & Whitney geared turbofan engines. The engines are on top of the plane's back end, flanked by two vertical tails to shield people on the ground from engine noise. The aircraft also would feature an advanced lightweight, damage tolerant, composite structure; technologies for reducing airframe noise; advanced flight controls; hybrid laminar flow control, which means surfaces designed to reduce drag; and long-span wings which improve fuel efficiency.
Lockheed Martin took an entirely different approach. Its engineers proposed a box wing design, in which a front wing mounted on the lower belly of the plane is joined at the tips to an aft wing mounted on top of the plane. The company has studied the box wing concept for three decades, but has been waiting for lightweight composite materials, landing gear technologies, hybrid laminar flow and other tools to make it a viable configuration. Lockheed's proposal combines the unique design with a Rolls Royce Liberty Works Ultra Fan Engine. This engine has a bypass ratio that is approximately five times greater than current engines, pushing the limits of turbofan technology.
Northrop Grumman chose to embrace a little of its company's history, going back to the 1930s and '40s, with its advanced vehicle concept. Its design is a flying wing, championed by Northrop founder Jack Northrop, and reminiscent of its B-2 aircraft. Four high-bypass engines, provided by Rolls Royce and embedded in the upper surface of the aerodynamically efficient wing would provide noise shielding. The company's expertise in building planes without the benefit of a stabilizing tail would be transferred to the commercial airline market. The Northrop proposal also incorporates advanced composite materials and engine and swept wing laminar flow control technologies.
What the studies revealed is that NASA's goals to reduce fuel consumption, emissions and noise are indeed challenging. The preliminary designs all met the pollution goal of eliminating landing and takeoff emissions of nitrogen oxides by 50 percent. All still have a little way to go to meet the other two challenges. All the designs were very close to a 50-percent fuel burn reduction, but noise reduction capabilities varied.
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(Larger images at link.)01.27.12
[font size=3]Leaner, greener flying machines for the year 2025 are on the drawing boards of three industry teams under contract to the NASA Aeronautics Research Mission Directorate's Environmentally Responsible Aviation Project.
Teams from The Boeing Company in Huntington Beach, Calif., Lockheed Martin in Palmdale, Calif., and Northrop Grumman in El Segundo, Calif., have spent the last year studying how to meet NASA goals to develop technology that would allow future aircraft to burn 50 percent less fuel than aircraft that entered service in 1998 (the baseline for the study), with 75 percent fewer harmful emissions; and to shrink the size of geographic areas affected by objectionable airport noise by 83 percent.
"The real challenge is we want to accomplish all these things simultaneously," said ERA project manager Fay Collier. "It's never been done before. We looked at some very difficult metrics and tried to push all those metrics down at the same time."
So NASA put that challenge to industry awarding a little less than $11 million to the three teams to assess what kinds of aircraft designs and technologies could help meet the goals. The companies have just given NASA their results.
"We'll be digesting the three studies and we'll be looking into what to do next," said Collier.
Boeing's advanced vehicle concept centers around the company's now familiar blended wing body design as seen in the sub-scale remotely piloted X-48, which has been wind tunnel tested at NASA's Langley Research Center and flown at NASA's Dryden Flight Research Center. One thing that makes this concept different from current airplanes is the placement of its Pratt & Whitney geared turbofan engines. The engines are on top of the plane's back end, flanked by two vertical tails to shield people on the ground from engine noise. The aircraft also would feature an advanced lightweight, damage tolerant, composite structure; technologies for reducing airframe noise; advanced flight controls; hybrid laminar flow control, which means surfaces designed to reduce drag; and long-span wings which improve fuel efficiency.
Lockheed Martin took an entirely different approach. Its engineers proposed a box wing design, in which a front wing mounted on the lower belly of the plane is joined at the tips to an aft wing mounted on top of the plane. The company has studied the box wing concept for three decades, but has been waiting for lightweight composite materials, landing gear technologies, hybrid laminar flow and other tools to make it a viable configuration. Lockheed's proposal combines the unique design with a Rolls Royce Liberty Works Ultra Fan Engine. This engine has a bypass ratio that is approximately five times greater than current engines, pushing the limits of turbofan technology.
Northrop Grumman chose to embrace a little of its company's history, going back to the 1930s and '40s, with its advanced vehicle concept. Its design is a flying wing, championed by Northrop founder Jack Northrop, and reminiscent of its B-2 aircraft. Four high-bypass engines, provided by Rolls Royce and embedded in the upper surface of the aerodynamically efficient wing would provide noise shielding. The company's expertise in building planes without the benefit of a stabilizing tail would be transferred to the commercial airline market. The Northrop proposal also incorporates advanced composite materials and engine and swept wing laminar flow control technologies.
What the studies revealed is that NASA's goals to reduce fuel consumption, emissions and noise are indeed challenging. The preliminary designs all met the pollution goal of eliminating landing and takeoff emissions of nitrogen oxides by 50 percent. All still have a little way to go to meet the other two challenges. All the designs were very close to a 50-percent fuel burn reduction, but noise reduction capabilities varied.
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New Ideas Sharpen Focus for Greener Aircraft (Original Post)
OKIsItJustMe
Jan 2012
OP
“Gliders, bicycle powered zeppelins, and sail boats are perhaps green for some definition green.”
OKIsItJustMe
Jan 2012
#5
caraher
(6,278 posts)1. One thing I wonder...
With the flying wing/"blended wing" designs, it seems like it would be a challenge setting up a passenger compartment that would feel comfortably familiar to present-day passengers. There don't seem to be easy ways to provide many windows, and I wonder about how easy such planes would be to evacuate in an emergency (I could see it going either way, depending on how they set up seats and exits).
OKIsItJustMe
(19,937 posts)2. Back to the future!
http://www.warbirdforum.com/paxwing.htm
[font face=Times,Times New Roman,Serif][font size=5]Northrop's flying-wing airliner[/font]
[font size=3]As early as 1948, Jack Northrop hoped to adapt his Flying Wing bomber as the world's sleekest airliner. Remember that in those days the concept of mass air transportation was some years in the future: everyone figured that only the rich or highly valued employees would be traveling by air. So the concept of an 80-passenger transport wasn't as far-fetched as it would seem today.
The big sell was the "window seating" with passengers lined up as if at a theater. Since this was only a mockup, not an actual aircraft, the marketing department was hard put to show the splendid view that the passengers were to enjoy. So it gave them a fellow passenger's rump:
[/font][/font]
[font size=3]As early as 1948, Jack Northrop hoped to adapt his Flying Wing bomber as the world's sleekest airliner. Remember that in those days the concept of mass air transportation was some years in the future: everyone figured that only the rich or highly valued employees would be traveling by air. So the concept of an 80-passenger transport wasn't as far-fetched as it would seem today.
The big sell was the "window seating" with passengers lined up as if at a theater. Since this was only a mockup, not an actual aircraft, the marketing department was hard put to show the splendid view that the passengers were to enjoy. So it gave them a fellow passenger's rump:
[/font][/font]
SpoonFed
(853 posts)3. Orwellian doublespeak buffer overrun.
Aircraft are not green, therefore the comparative adjective "greener" is non-sense.
Gliders, bicycle powered zeppelins, and sail boats are perhaps green for some definition green.
Fossil-fuel powered aircraft, nope, sorry.
OKIsItJustMe
(19,937 posts)5. “Gliders, bicycle powered zeppelins, and sail boats are perhaps green for some definition green.”
- How does a glider get into the air? Typically it is towed aloft by a conventional airplane.
- How is a bicycle manufactured? Most likely fossil fuels are used in the refining of the metals, to make the plastic parts, to weld the frame
- What gas holds the zeppelins aloft? Probably helium (a non-renewable resource.)
- How is the sail boat manufactured? (See bicycle above.)
What makes any of these things green? (Not because they are using no energy, but because they are using less energy.)
Aircraft can be flown using renewable energy sources, and ones which use less energy are more ecologically sound than ones which use more.
Forget about banishing airlines. (Its not going to happen.) Lessen their impact.
hunter
(38,303 posts)4. Already been invented. It's called electric high speed rail...
http://en.wikipedia.org/wiki/High-speed_rail
What we really need, more than anything else, is much longer vacations. Then we could travel slower but with style, not stuffed into a flying aluminum cigar tube.
http://en.wikipedia.org/wiki/Dining_car