Absolutely no soot in that engine, nor in the injector. HTP-propane (or
HTP-methane which I used during dev for simplicity) burns with a pale
pink/orange flame and zero soot.
[image: HTP-methane.png]
On Mon, Jul 4, 2022 at 3:22 PM Alexander Mikhailov <
alexander.mikhailov@xxxxxxxxx> wrote:
There was No Damn Way I was going to work with peroxide-alcohol. Propanehas higher Isp, anyway.
Got some second thoughts about it when reminded about soot - not in
regenerative channels, which peroxide handles nicely, but in the
injector head. Well... for some reasons now propane is better again,
safety officer can sleep a little better.
On 7/4/22, roxanna Mason <rocketmaster.ken@xxxxxxxxx> wrote:
If there's a pad failure after ignition the mixing propellants will ignitwrote:
immediately as they mix real time so a premix then ignition is unlikely.
Perhaps having flares preburning like they do with the shuttle SSME is a
good idea.
Ken
On Mon, Jul 4, 2022 at 10:22 AM Doug Jones <rocketplumber@xxxxxxxxx>
though.
The miscibility makes me think that placing LOX tanks under LNG may help
reduce the mixing due to density. LOX over LNG may be good for vehicle
CG,
but scary for a fallback scenario.
The upper stage makes sure you have a Dagwood sandwich of mixing,
Even
On Sat, Jul 2, 2022 at 12:52 AM Henry Spencer <hspencer@xxxxxxxxxxxxx>
wrote:
On Fri, 1 Jul 2022, willsrw@xxxxxxxxx wrote:
I’m surprised the conversion is assumed to be one to one. A one to
one
conversion (propellant to TNT equ) means 100% mixing to a perfect
mixture ratio throughout the entire volume of propellant.
No, not nearly -- methane's heat of combustion (complete combustion,
oxygen included in mass, but assuming water vapor produced remains
vapor)
is 10.0 MJ/kg, while nominal TNT energy output is about 4.6 MJ/kg.
considering that a typical propellant mix doesn't contain enough oxygen
for complete combustion, LOX/CH4 is quite a bit more powerful than an
equivalent mass of TNT. Perfect mixing would yield close to 200%.
Difficult to do.
But much less difficult than for LOX/LH2 or LOX/kerosene, where the
large
temperature difference gets in the way. That's why people are wary of
LOX/methane, in the absence of large-scale tests -- good mixing is much
more plausible when the two liquids are at about the same temperature
and
are fully miscible.
Henry