Bill
Years ago I was with a group that designed, built and test fired a liquid
engine (LOX kero, Pc=300psi) using a phenolic/fiberglass combustion chamber and
nozzle. Our combustion chamber wall was roughly .25 to .3 inches thick. They
lasted for 12 seconds. Our design goal was 10 seconds. The throat eroded a
lot but the engine did produce 300 lbs of thrust, our goal.
We used fiberglass roving to wind it. Used a small oven to cure it (while
rotating ). The toughest problem was removing the mandrel from the engine.
The solution was to slope the combustion chamber mold a few degrees and use a
mold release wax and single layer of plastic wrap. The mold was split at the
throat. We built a simple jig to pull the molds apart. Worked like a charm.
Hope this helped,
Rick
From: arocket-bounce@xxxxxxxxxxxxx [mailto:arocket-bounce@xxxxxxxxxxxxx] On ;
Behalf Of William Claybaugh
Sent: Wednesday, January 31, 2018 5:28 PM
To: arocket@xxxxxxxxxxxxx
Subject: [AR] Re: Phenolic regression rate
Ignacio:
Hazel and Huang reference (page 382 of the 1992 AIAA edition) an emperical
equation for silica-phenolic exposed to NTO and hydrazine-like combustion
products.
I’m looking to develop a similar understanding for paper-phenolic and solid
propellant. I can do that if I get enough user experience as to what did not
burn through.
Bill
On Wed, Jan 31, 2018 at 3:13 PM ignacio belieres <ignacio_belieres@xxxxxxxxxxx
<mailto:ignacio_belieres@xxxxxxxxxxx> > wrote:
Bill,
I believe you can find something similar to what you are looking for in huzel
and huang. I implemented a version of the ablative model described there and it
seemed to give fairly reasonable results.
Cheers,
IB
-------- Original message --------
From: William Claybaugh <wclaybaugh2@xxxxxxxxx <mailto:wclaybaugh2@xxxxxxxxx> >
Date: 1/31/18 7:03 PM (GMT-03:00)
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Re: Phenolic regression rate
Anthony:
I do understand the many variables; I’m just looking for user experience.
If I can get enough data on what doesn’t burn through I can estimate how thick
XX needs to be for the 10 seconds at which I’m looking.
Bill
On Wed, Jan 31, 2018 at 1:34 PM Anthony Cesaroni <acesaroni@xxxxxxxxxxx
<mailto:acesaroni@xxxxxxxxxxx> > wrote:
Depends where in the motor, the grain geometry, the gas velocity and conditions
as well as the type of phenolic, the reinforcement used as and any fire
retardants added.
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
From: arocket-bounce@xxxxxxxxxxxxx <mailto:arocket-bounce@xxxxxxxxxxxxx>
[mailto:arocket-bounce@xxxxxxxxxxxxx ;<mailto:arocket-bounce@xxxxxxxxxxxxx> ] On
Behalf Of William Claybaugh
Sent: Wednesday, January 31, 2018 3:08 PM
To: arocket@xxxxxxxxxxxxx <mailto:arocket@xxxxxxxxxxxxx>
Subject: [AR] Phenolic regression rate
Does anyone have any data on how long I can expect XX phenolic to survive the
conditions in a solid rocket motor?
Anecdotal data helps: if some part of the phenolic wall was fully exposed to
hot gas and was xx.xx inches or millimeters thick and did not fail; that’s
data. If it did fail, that is data too.
I’m adept at squeezing trends out of limited data but 20 or so usable data
points are sort of a minimum; I’m very happy to share any conclusions I may
reach.
Bill