The injector is just a 1/4 inch copper tube I put in a drill chuck and crimped down to almost nothing. The flame tube was built with a 4 inch exhaust tubing and holes drilled throughout with calculations found on the internet. Smaller to larger holes as it gets closer to turbine.
Since the last video I did make a few changes to the fuel delivery system and I did install a thrust tube which is a constant taper tube from 3 inches down to 2 inches. I ran it with the tube and had problems with it popping and surging on throttle up. I cut the thrust tube down and the popping and surging did mostly go away.
Ken
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From: "John WALLIS \(Racketmotorman\)" <racketmotorman@...>
Sender: DIYGasTurbines@yahoogroups.com
Date: Thu, 26 Jan 2012 18:21:51 +1000
To: <DIYGasTurbines@yahoogroups.com>
ReplyTo: DIYGasTurbines@yahoogroups.com
Subject: Re: [DIYGasTurbines] Boost pressures and EGTs
Hi Ken
I just had a look at the video and I'm a bit concerned about the turbine wheel temperature as it appears there is flames at the turbine , without any jetpipe or nozzle on the engine the "EGT" temperatures should be fairly low at that ~750 deg F level , but your "compressor side" temp ( T I T ) at 1600 F is way too high , at a P2 of 24 psi ( 2.63 PR) , you should have a temp rise of ~240 deg F in the comp requiring a temp dop thru the turbine of ~ 210 deg F , so if the TOT is 750 F then T I T should only be ~960 F .
What sort of propane injector are you using??
What flametube design ??
Cheers
John
----- Original Message -----
Sent: Thursday, January 26, 2012 9:35 AM
Subject: [DIYGasTurbines] Boost pressures and EGTs
I put a boost gauge on my gas turbine last weekend and I saw about 22-24 PSI at full throttle running on propane. My EGT at turbine and thrust tube was about 750-800F. The compressor side was around 1600F. Is this a good place I need to be?
http://www.youtube.com/user/hyprmtr?blend=1&ob=video-mustangbase
Ken
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