[Gasification] Underwater gasification?
linvent at aol.com
linvent at aol.com
Sun May 22 19:11:17 CDT 2011
An interesting aspect of propulsion is that the engine combustion
process cannot exceed the speed of sound. On the SR-71 Blackbird
engines, there are intake cones in the engine cowling which slow down
the air speed so that it would combust in the engines. I understand
that in the early ones these were manually shifted in and out and could
lead to flame out if not set right. Now, if the engine exhaust is
slower than the supersonic speed that the aircraft is traveling at, how
does it move supersonic? The same is stated for rockets, particularly
if they are moving near the speed of light. The SR-71 still has
classified top speed and altitude.
Tom Taylor
-----Original Message-----
From: Daniel Chisholm <dmc at danielchisholm.com>
To: Discussion of biomass pyrolysis and gasification
<gasification at lists.bioenergylists.org>
Sent: Sun, May 22, 2011 5:52 pm
Subject: Re: [Gasification] Underwater gasification?
A Humphrey-inspired water jet is an interesting idea.
FWIW I don't think it would be an efficient means of low speed marine
propulsion though; it would suffer from low propulsive efficiency
because the jet velocity would be too high. The efficiency of a
reaction engine (which is something that generates thrust by
accelerating and expelling mass - a very broad category that includes
not just jet and rocket engines but also propellers on aircraft and
ships) depends on the speed at which the mass is expelled.
Accelerating a small mass to a large speed, is not as efficient as
accelerating a larger mass to a lesser speed. If you look at aircraft
jet engines today (high bypass ratio turbofans) you will notice that
they are much larger in diameter than the jet engines of the 1950s
(turbojets) - this is why.
--
- Daniel
Fredericton, NB Canada_______________________________________________
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