Cooled N2O-C2H2 might be OK to let it go bang in a PDE for propulsion! Albeit a
cooled monoprop is somewhat far fetched to be practical.
John
-----Original Message-----
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Terry McCreary
Sent: zaterdag 28 april 2018 4:28
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: mixed monoprops (was Re: DARPA responsive launch challenge)
Perhaps something other than CO2 might be fruitful here. Halons work, not by
smothering the fire but by reducing production of radicals involved in flame
propagation. If the chemical mechanism--the step-by-step sequence of molecular
collisions--of the N2O-C2H2 reaction is known, perhaps an additive could be
found that interferes with the rate-determining step.
There are at least two problems that I can think of, right off the bat.
First, that additive would almost certainly interfere with the desired reaction
in the combustion chamber. Second, the decomposition of acetylene into its
elements is a spontaneous reaction (delta-G of formation is positive). If an
additive that would prevent that from happening was known, it would probably
already be in use in acetylene used for welding.
Best -- Terry
On 4/27/2018 12:10 AM, Troy Prideaux wrote:
--There may be problems where CO2 freezes or evaporates out of solutionI can't see acetylene coming out or CO2 for that matter. Nitrous is a very
prior to the nitrous, but presumably there are worse problems with
acetylene coming out of solution with pressure/temperature.
effective solvent for organics. The partnership with something like acetylene
will be quite an intimate affair and I just can't see CO2's pacification role
producing anything other than a subtle reduction in explosive yield when the
2 energetic compounds inevitably get down and boogie.
Troy