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*
* 27
*

ROLLS-ROYCE ACHIEVES CONTROLLED HYDROGEN BURN

Submitted 3 months ago
Rolls-Royce says it has run a modified version of a standard jet engine at
takeoff power using hydrogen for fuel. The company said it’s a key
accomplishment in developing future carbon-free designs that can power future
aircraft. “This involved overcoming significant engineering challenges as
hydrogen burns far hotter and more rapidly than kerosene,” Rolls-Royce said. The
tests were carried out on a modified Pearl 700 engine. (www.avweb.com) More...

Sam Negrete

25 MEMBER COMMENTS

SORT TYPE: [TOP] [NEWEST]

Post my comment →
carpetshoe 3 months ago 4
* Downvote
* Upvote

Alright, don’t mind my previous comment. It seems that the test was performed
with pure hydrogen. Cool!
Reply ↓•Permalink•Report

w2bsa 3 months ago 4
* Downvote
* Upvote

It seems that there is one consistent naysayer who criticizes everything
everyone has said in the article. Frankly, I don’t listen to folks who do that.
Reply ↓•Permalink•Report

Billy Koskie 3 months ago 2
* Downvote
* Upvote

The density of energy in hydrogen drastically limits what it can be used for.
You'll need a plane the size of an A380 to get the range and payload of a region
jet. It's hard to beat hydrocarbons for energy density.
Reply ↓•Permalink•Report

zahid major 3 months ago 2
* Downvote
* Upvote

Nice innovation in jet engine fuel....
Reply ↓•Permalink•Report

carpetshoe 3 months ago 2
* Downvote
* Upvote

Is this a test with a hydrogen composition of 100% (or at least relatively close
to it)? The article doesn’t appear to say anything about this so I wonder if
anyone else knows. Thanks!
Reply ↓•Permalink•Report

--------------------------------------------------------------------------------

coinflyer 3 months ago 1
* Downvote
* Upvote

The article stated "Newly developed fuel spray nozzles mix air with the hydrogen
at precise levels to control the burn rate." What those "precise levels" are was
not mentioned.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

carpetshoe 3 months ago 1
* Downvote
* Upvote

Thanks for the reply. Indeed, I figured that refers to the air fuel ratio. But
what the fuel composition is remains a bit opaque for me. Perhaps that’s the
reason that they don’t say it outright?
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

Jerry Hargis 3 months ago 2
* Downvote
* Upvote

It says HYDROGEN.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

btweston 3 months ago 3
* Downvote
* Upvote

Yes, some people endeavor to remain so open-minded that their brains fall out.
Reply ↓•Permalink•Parent•Report

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w2bsa 3 months ago 2
* Downvote
* Upvote

I’m sure that Rolls Royce isn’t going to spill all of the beans on their engine!
Remember, they are in this to make money off of this engine should it prove
completely successful.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

bobinson66 3 months ago 0
* Downvote
* Upvote

I had to Google it but Hydrogen won't burn without oxygen.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

Philip Lanum 3 months ago 1
* Downvote
* Upvote

Are you trying to say that Hydrogen will not burn without adding Oxygen?
The free Oxygen in Earth's atmosphere is not enough to allow for combustion?
Wait - What?
Reply ↓•Permalink•Parent•Report

Eric Rindal 3 months ago 1
* Downvote
* Upvote

Hydrogen rides in the fuselage, Passengers in the wings :)
Reply ↓•Permalink•Report

Steven Williamson 3 months ago 1
* Downvote
* Upvote

Hinden-burn.
Reply ↓•Permalink•Report

dilkie 3 months ago 0
* Downvote
* Upvote

great news... only real issue with H2 as a fuel is it's density. Far less
energy/kg than hydrocarbons and the only way to store as a gas (cryogenic
cooling to a liquid doesn't seem feasible) is very high pressure (heavy) or
hydride storage (again, somewhat heavy).

But we're humans, super smart at solving problems.
Reply ↓•Permalink•Report

Reginald Caton 3 months ago 0
* Downvote
* Upvote

They do say that the spray nozzles mixed the hydrogen with air to control the
burn rate so it wasn't pure hydrogen but diluted with air.
Reply ↓•Permalink•Report

--------------------------------------------------------------------------------

btweston 3 months ago 4
* Downvote
* Upvote

Yeah I think I heard somewhere that oxygen is important when it comes to
combustion.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

Philip Lanum 3 months ago 2
* Downvote
* Upvote

Whoosh!
Reply ↓•Permalink•Parent•Report

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Phillip Reed 3 months ago 2
* Downvote
* Upvote

Well, jet fuel is diluted with air before burning as well, so I guess that's OK.
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

RG GR 3 months ago 2
* Downvote
* Upvote

Atomized
Reply ↓•Permalink•Parent•Report

Pete Perez 3 months ago -1
* Downvote
* Upvote

First off as a chemical, hydrogen needs oxygen to act as a fuel. I'm sure
there's plenty in the atmosphere to do the job. Second once Quantum computing
becomes a reality experiments like this will be a thing of the past. I suspect
that RR is trying to get ahead of the game. Fossil fuels will be a thing of the
past. Hydrogen is the future for long distance travel, unless we find a lighter
more efficient battery. What we believe today in aviation will change with the
utilization of Quantum computing. What took years will take days to understand.
Reply ↓•Permalink•Report

F Minook 3 months ago -1
* Downvote
* Upvote

This is for m6thompson@yahoo.com in the comment section. Your comment is so
wise. The other problem is that hydrogen combines with oxygen which produce
water (h2o). You stated that the heat produced by the "burn" is a good. That is
a true statement. The heat need to be "harnessed" to produce steam propulsion
(like in trains).
Reply ↓•Permalink•Report

jmilleratp 3 months ago 0
* Downvote
* Upvote

Rolls-Royce is also one of the companies working on Small Modular Reactors,
small nuclear reactors that can be manufactured and installed at sites, instead
of the larger reactors where everything must be assembled on site. The UK will
get Rolls-Royce's first two SMR's around 2029.
Reply ↓•Permalink•Report

--------------------------------------------------------------------------------

Philip Lanum 3 months ago -1
* Downvote
* Upvote

And this applies to using Hydrogen as a fuel in airplanes ---- how?
Reply ↓•Permalink•Parent•Report

--------------------------------------------------------------------------------

jmilleratp 3 months ago 2
* Downvote
* Upvote

Well, for those interested in science and not trolling, this shows that
Rolls-Royce is involved in advancing technologies.
Reply ↓•Permalink•Parent•Report

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