[AR] Re: TiH2: useful in rockets?
- From: "Troy Prideaux" <troy@xxxxxxxxxxxxxxxxxxxxx>
- To: <arocket@xxxxxxxxxxxxx>
- Date: Tue, 16 Mar 2021 01:30:05 +1100
There's only a modest increase by upping the N2O to say 42:88 ratio. Maybe
add another 8 sec. That's assuming 1000psi chamber, sea level ambient with
optimal expansion.
Some interesting notes:
50% of the exhaust is liquid phase Ti4O7 ?
The maximum amount of *chemical* energy possible from the combination is
about 7.12 KJ/g
The maximum amount of *chemical* energy possible from a 75:25 mix of AP:R45
is only 4.95 KJ/g
Troy
From: arocket-bounce@xxxxxxxxxxxxx [
mailto:arocket-bounce@xxxxxxxxxxxxx] On
Behalf Of Terry McCreary
Sent: Monday, 15 March 2021 11:54 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: TiH2: useful in rockets?
I just ran TiH2 with N2O and at TiH2:N2O of about 42:58 isp calculates as
234 s. A lower amount of TiH2 might give higher Isp but Propep vomited and
went crackerjack, saying "No Convergence, do not trust results!!!" at all
lower TiH2 proportions. I obeyed. :-)
[I know Propep's results are to be taken with a grain of salt but it's still
fun to play with, 25+ years after I first tried it with Gordon Campbell's
horrible DOS front end.]
I had not thought about the safety aspects of TiH2:N2. If it can be ignited
with reliability and will sustain combustion it might be a viable
combination. It's possible that results might vary significantly from one
batch of TiH2 to another, as it's a nonstoichiometric compound.
Best -- Terry
_____
From: arocket-bounce@xxxxxxxxxxxxx <
mailto:arocket-bounce@xxxxxxxxxxxxx>
<arocket-bounce@xxxxxxxxxxxxx <
mailto:arocket-bounce@xxxxxxxxxxxxx> > on
behalf of Henry Spencer <hspencer@xxxxxxxxxxxxx
<
mailto:hspencer@xxxxxxxxxxxxx> >
Sent: Sunday, March 14, 2021 7:12 PM
To: arocket@xxxxxxxxxxxxx <
mailto:arocket@xxxxxxxxxxxxx>
<arocket@xxxxxxxxxxxxx <
mailto:arocket@xxxxxxxxxxxxx> >
Subject: [AR] Re: TiH2: useful in rockets?
On Sun, 14 Mar 2021, Terry McCreary wrote:
FWIW on a quick series of runs with Propep 3, optimum Isp is just under
160 seconds for a TiH2:N2 ratio of 75:25.
Really N2, or N2O?
Henry
Other related posts: