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Post by racket on Oct 13, 2019 15:27:58 GMT -5
How was the transimission setup , were the wheels off the ground??
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Post by azwood on Oct 13, 2019 15:29:34 GMT -5
How was the transimission setup , were the wheels off the ground?? Just had the shaft running by its self not connected to anything
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Post by azwood on Oct 13, 2019 15:32:31 GMT -5
How was the transimission setup , were the wheels off the ground?? Just had the shaft running by its self not connected to anything Not anless I have some heat bind in the bearings didn't think of that
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Post by turboron on Oct 13, 2019 15:52:14 GMT -5
azwood, what was your combustor/compressor discharge pressure(CDP)? A pressure of 15 psig at the combustor is only a pressure ratio of (15+14.7)/14.7 = 2.02. My suggestion is to get a new boost (CDP) gauge on it and get more fuel into the combustor. Record the fuel pressure if you can measure it. You can calculate a air flow from the fuel pressure. With a air flow and pressure ratio you can see where you are on the compressor map.
Turbine discharge temperatures are as very helpful and easily measure with a thermocouple and a digital thermometer.
Thanks, Ron
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Post by azwood on Oct 13, 2019 15:59:42 GMT -5
azwood, what was your combustor/compressor discharge pressure(CDP)? A pressure of 15 psig at the combustor is only a pressure ratio of (15+14.7)/14.7 = 2.02. My suggestion is to get a new boost (CDP) gauge on it and get more fuel into the combustor. Record the fuel pressure if you can measure it. You can calculate a air flow from the fuel pressure. With a air flow and pressure ratio you can see where you are on the compressor map. Turbine discharge temperatures are as very helpful and easily measure with a thermocouple and a digital thermometer. Thanks, Ron The thurmocouple is just after the gas producers outlet it's reading 950f but I agree with no boost gauge it's hard to say what pressure it was I'd be guessing based of my previous runs when it worked.with it fairly singing I got 30psi in the gas producer lol at that point every dog in a 5 kilometre radius is hawling.
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Post by turboron on Oct 13, 2019 17:05:48 GMT -5
azwood, I looked at my TV94 performance cycle with a pressure ratio of 3/1 (30 psig CDP). The gasifier turbine inlet temperature of 1475 degrees F and the discharge temperature was 1200 degrees F so you need more fuel to find out if your unit has a problem. The 1475 degree F inlet temperature is a good place to stop until you get the unit fully sorted.
Thanks, Ron
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Post by azwood on Oct 13, 2019 17:30:14 GMT -5
azwood, I looked at my TV94 performance cycle with a pressure ratio of 3/1 (30 psig CDP). The gasifier turbine inlet temperature of 1475 degrees F and the discharge temperature was 1200 degrees F so you need more fuel to find out if your unit has a problem. The 1475 degree F inlet temperature is a good place to stop until you get the unit fully sorted. Thanks, Ron Ok so it could be a heat fuel thing I'll stop freaking out about it and get some more measurements I don't have the pitot in the new outlet guess that may help and I'll get a fuel gauge to I may not be hitting the pressures I think I am I guess without the boost gauge I was hesitant to push it to far.
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Post by racket on Oct 13, 2019 17:45:13 GMT -5
Hi Aaron
Yep , you need lotsa gauges to problem solve .
Your temperature reading is relativly low so no damage done .
But a freewheeling freepower very quickly reaches very high rpm , so be careful .
Cheers John
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Post by turboron on Oct 13, 2019 19:56:56 GMT -5
azwood, as John says it is very dangerous to run a gas turbine without a load on the free power turbine. I took out a big plug from a concrete test cell wall one time when the power turbine lost its load. A spline disengaged from a gearbox.
Thanks, Ron
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Post by azwood on Oct 13, 2019 21:53:21 GMT -5
azwood, as John says it is very dangerous to run a gas turbine without a load on the free power turbine. I took out a big plug from a concrete test cell wall one time when the power turbine lost its load. A spline disengaged from a gearbox. Thanks, Ron Ok I'll definitely keep that in mind yacks 🤔
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Post by azwood on Nov 24, 2019 23:15:15 GMT -5
Had the free power unit apart again added bleed air to the bearings and opened up the bearing hole to make it a nice push in fit not a press fit as the manufacturer said to do for high rpm put everything back together and tested it with the leaf blower with success she spools right up and really gets going. im happy that it seems ok.
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Post by azwood on Nov 25, 2019 18:42:47 GMT -5
I'm sorta at the point where I need to balance the turbine I went to a place that did drivetrain parts but there machine only goes to 3000rpm when I said it spins to about 35000rpm they said they can't do it.i know how to make a rolling rig but that's only single plane ballaceing I'm worried if I get vibration bearings will fail.people say dynamic is the best.
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Post by racket on Nov 25, 2019 18:49:09 GMT -5
You don't need to spin it at high rpm to balance it , a couple of thousand will be plenty
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dieselguy86
Veteran Member
Joined: September 2014
Posts: 187
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Post by dieselguy86 on Nov 25, 2019 20:05:53 GMT -5
The tiny turbos i build spin up to 190k rpms, but are only spun at 2,000 rpms on the balancer.
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Post by azwood on Nov 25, 2019 20:19:02 GMT -5
Ok I'll talk to some more places see what I can find
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