Yeah I wouldn't worry about 12-14" flame from a combustor running at
atmospheric... nice big burner by the sound of it, should be OK - like marshall
says, try and get her 'over the hump' more start air and gently feed in more
fuel you should see temps come down as things get exciting! Do let us see some
pics of the flame tube though in case there's anything obvious we can help
with...



--- In DIYGasTurbines@yahoogroups.com, Marshall Piper <marshall01@...> wrote:
>
>
> Did you use jet specs to figure out the hole sizes and amount of holes on your
flame tube ? I know that sometimes if you don't give the engine enough fuel at
start-up you will have a hangstart where the turbo almost wants to spool up but
it can't and the exhaust temp will skyrocket as the flame is going right through
the turbine blades . It sounds foolish but sometimes more fuel and more air from
your leaf blower or whatever you use to get it spinning will get it running with
less exhaust temps . These engines do run at a fairly high idle so you got it
running but it may be running at too low an idle to get enough dilution air in
the flame tube fo a proper burn . What is the P2 pressure when idling it should
be around 10 PSI . Hope this helps .
>
> Marshall
>
>
>
> To: DIYGasTurbines@yahoogroups.com
> From: texasbryant79@...
> Date: Thu, 9 Jul 2009 23:20:40 +0000
> Subject: [DIYGasTurbines] help with combuster can
>
>
>
>
>
>
>
> Hello all,
> I just fired up my first jet engine today, and the tubine temp to idle the
engine was 1450 degrees. I know this is high especially if I ever want to take
the enigne higher than idle. the specs on my turbo are
> compressor: 3" inducer, 2" exducer
> torbine: 2.58" inducer, 2.2" exducer
> I have a 14" long combuster housing that measures 6.25" in diameter and a 4"
flame tube with a total of 9" of holes drilled in it. I noticed while test
firing the combuster can without the turbo on it that I had a flame shooting out
about 12-14" for the exit of the can. I am running propane only and don't plan
on running anything else on this engine. any help would be greatly appreciated
on the subject. I am thinking that I don't have enough airflow to completely
burn the fuel before it exits the flame tube. thanks for the help in advance.
>
>
>
>
>
>
>
>
>
> _________________________________________________________________
> Windows Live helps you keep up with all your friends, in one place.
> http://go.microsoft.com/?linkid=9660826
>
> [Non-text portions of this message have been removed]
>