I don't recall seeing any sooting result from burns of the 5m15 using
the local vehicle-grade LNG fuel supply.
Henry
On 4/4/2017 6:54 PM, Graham Sortino (Redacted sender gnsortino for
DMARC) wrote:
This question is somewhat ignorant as I don't have a lot of experience
with methane (or LNG) but does it produce a thermal barrier similar to
RP1/Jet-A? I find that the thermal barrier seems to be one of the most
appealing aspects of using refined hydrocarbons over something like
ethanol but I've not really considered methane. Methane does seem to
have a slightly higher ISP then RP1/Jet-A albeit with roughly half the
density.
On Tuesday, April 4, 2017, 8:54:26 AM EDT, Brian Feeney
<alaiadesign@xxxxxxxxx> wrote:
Both Blue Origin and Space X are using Methane in their new engines
currently under development.
Again both say they are shooting for very high reusability rates, rapid
turn around times measured in hours and 100's if not 1,000 cycles plus
target in the case of Blue.
I assume they must be using a high purity form of methane as described
by Henry Spencer to reduce the chances of coking, corrosion with the
copper inner chamber...
Can one get a non stenchant form of purified methane in bulk and or
would they both have to purify it (remove Mercaptans, any polymerizing
compounds etc) after taking delivery. i.e. is it legal, safe to road
transport in bulk in a purified non odour form.
Cheers
Brian Feeney
On Tue, Apr 4, 2017 at 12:30 PM, Henry Spencer <hspencer@xxxxxxxxxxxxx
<mailto:hspencer@xxxxxxxxxxxxx>> wrote:
On Sun, 2 Apr 2017, Graham Sortino wrote:
Is there any general guidelines in terms of the temperature or
pressure at
which point coking in coolant channel occurs when using Jet-A
(ie. some kind
of max temp and/or pressure to avoid)?
Never heard of anybody looking into that, although it's not
something I've gone looking for. Possibly there might be something
to be found in studies of fuel stability in high-supersonic and
hypersonic aircraft (where friction heating can get fuel in wing
tanks pretty hot) -- not quite the same problem, and often dealt
with by using special fuels, but it might offer some hints.
It would be tricky to get good numbers for something like Jet-A
because there's so much variation in its exact composition.
Henry
