Skip to comments.Hydrogen should take priority over biofuel in aviation
Posted on 12/01/2010 9:47:10 PM PST by ErnstStavroBlofeld
The aviation industry should focus research and development programmes on liquid hydrogen rather than third-generation biofuels in the quest to reduce carbon dioxide emissions, according to World Wildlife Fund director for global energy policy Stephan Singer.
Speaking at a roundtable on environmental issues at the European Parliament in Brussels today - part of the Aerospace and Defence Industries Association of Europe's (ASD) Aeroweek conference - Singer said liquid hydrogen and algae-derived biofuels should be the focus of investment over other alternative fuels because they are less likely to interfere with land used for food producti
(Excerpt) Read more at flightglobal.com ...
The aviation industry should concentrate on abundance, efficiency and progress, and forget the quest to reduce carbon dioxide. Lunacy is never a good plan for the future.
I agree.But its not the aviation industry that is pursuing it. Both the USAF and USN is looking into this.
At Edwards AFB they are testing planes with 50/50 blends.
First law of cryogenics: Hydrogen leaks.
Second law of cryogenics: Helium leaks worse than Hydrogen.
Personally I’d prefer to fly on something fueled by a propellant at or near room temperature.
What a bunch of crap... H2 is at best an energy storage system, and a poor one at that.
Hydrogen takes more energy to extract from natural sources than bio fuels. I would concentrate on finding an efficient way to extract bio diesel from algae.
Hydrogen is a powerful, but extremely inefficient fuel. Not only does it have to be cooled to _very_ low temperatures (colder than oxygen) to become a liquid, but its low molecular density requires large storage tanks.
As an example of the technical difficulties involved, the American space program was using LH-fueled rockets in the ‘60s, but the less advanced Soviet program didn’t attempt it until the ‘80s.
One would think too that the extreme flammability of hydrogen would make it a tad dangerous for use outside of rockets. Hindenburg disaster, anyone?
I cannot believe this is a serious proposal. Hydrogen storage would be far to heavy to be practical on an aircraft. Onboard hydrogen generation from hydrocarbons would also be heavy, and it would be difficult for it to achieve the reliability required for air transportation.
The storage problem for hydrogen is a big deal. High pressure and leaks are a problem that has yet to be solved in a satisfactory fashion.
Hydrogen simply does not have the energy density to act a fuel for air breathing engine powered airplane
I’d feel safe on an airplane powered with helium.
“Hydrogen ordinarily burns with a colorless or pale blue flame.”
As anyone can see by looking at pictures or video of a space shuttle launch.
Aside from the Hindenburg disaster, another example of hydrogen’s explosive properties was the 1965 Atlas-Centaur launch that fell back onto the pad, producing a quite huge mushroom cloud that put the launch facility out of commission for months. This was the biggest pad explosion to ever happen at Cape Canaveral.
The Challenger disaster of course also involved liquid hydrogen. Most of the explosion there was really a huge cloud of water vapor caused by the LH and liquid oxygen mixing after the external fuel tank broke up.
It takes very high pressure to ignite a LH-LO mixture. If the pressure is too low, you just get water vapor and no combustion. The shuttle main engines posed a serious development challenge since they were designed to be reusable, unlike the earlier Saturn and Centaur engines.
Those are so safe they don’t even need wings.
A-MEN! to that.
CO2 in current atmospheric concentrations is a plant growth stimulant, not a pollutant. The “reducing pollution” argument we get from the AGW Greenies is just absurd.
It worked so well for the Hindenburg...
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