Thanks Bob – also with some additional reading I now have a grasp. It’s the
constant volume heating that allows large pressure ratios (Pc:Pe) without
needing high pressure injection.
Funny that’s kinda my initial impression of how they worked, but this thread
(particularly with the mention of rotary PDEs and some of the terminology) had
me second guessing :)
Regards,
Troy
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Robert Steinke
Sent: Friday, 31 January 2020 12:40 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Orions and PDEs (was Re: More MAX delays.)
In a regular deflagration, the flame front is (relatively) slow so as the gas
is heated it flows away from the flame and expands at constant pressure.
In a detonation, the flame front travels faster than the speed of sound. The
gasses can’t flow away from the flame. They just can’t go that fast. The
Reaction is all done before the gas can go anywhere so the effect is constant
volume heat addition even if the gasses are not held in by any container. No
work is done until after the heat addition is complete.
On Thu, Jan 30, 2020 at 5:31 PM Anthony Cesaroni <anthony@xxxxxxxxxxx
<mailto:anthony@xxxxxxxxxxx> > wrote:
Crickets huh? 😊
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
<http://www.cesaronitech.com/> http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
-----Original Message-----
From: <mailto:arocket-bounce@xxxxxxxxxxxxx> arocket-bounce@xxxxxxxxxxxxx <
<mailto:arocket-bounce@xxxxxxxxxxxxx> arocket-bounce@xxxxxxxxxxxxx> On Behalf
Of Troy Prideaux
Sent: Thursday, January 30, 2020 7:27 PM
To: <mailto:arocket@xxxxxxxxxxxxx> arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Orions and PDEs (was Re: More MAX delays.)
I'm totally lost with understanding this process. Can anyone describe the
physical mechanism that enables PDEs to "theoretically" operate in a constant
volume process?
Constant volume processes (to me) implies no work done by the working fluid.
Yes there will be higher pressure and temperature outcomes because there's no
work being done - but obviously I'm missing something.
I'm guessing the detonation mechanism somehow uses more available energy for
molecular translation and less going into molecular rotation? I'm curious to
understand the mechanism.
Thanks,
Troy
