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Post by azwood on Sept 19, 2018 15:36:37 GMT -5
Yeah do you think its still a little high.i could add some vains to the wall of the the outer can to slow the air flow to the primary and secondary zones and favor the tursurey zone more maybe. |
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Post by azwood on Sept 19, 2018 16:50:35 GMT -5
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Post by racket on Sept 19, 2018 16:58:28 GMT -5
What P2 were you running at 650 C
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Post by azwood on Sept 19, 2018 16:59:45 GMT -5
Thinking of getting the power turbine is it possible or even safe to make one myself provided i get professionally balanced.heres one i seen on YouTube i think i can make it a little more tidy than this.   |
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Post by azwood on Sept 19, 2018 17:01:21 GMT -5
What P2 were you running at 650 C I fogot to use the gauge i was just looking at egt's but ill do another run |
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Post by azwood on Sept 19, 2018 17:06:13 GMT -5
Just to clarify is p2 pressure at the pitot tube or burner can.
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Post by racket on Sept 19, 2018 17:10:42 GMT -5
P2 is compressor discharge pressure , so "in the can" , but outside the flametube
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Post by azwood on Sept 19, 2018 17:39:06 GMT -5
P2 is compressor discharge pressure , so "in the can" , but outside the flametube Yep got it.i did notice temps climb at low barly self sustain pressure it seems to prefer a higher idle.i might need to restrict the fuel line to im useing more than it needs the engine rmp hangs a little when decelerating |
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Post by racket on Sept 19, 2018 19:41:05 GMT -5
Yep , idle needs to be at 5psi P2 or higher to be on the safe side.
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Post by azwood on Sept 20, 2018 3:54:17 GMT -5
Is there any point to adding vains to the inner wall of the can just above the tursurey zone to direct the flow a little more to the holes before it goes to the top.
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Post by racket on Sept 20, 2018 4:23:25 GMT -5
Theres no point doing anything until you collect data that includes temperatures vs pressures .
Currently you have "highish" temperatures , but on their own they're meaningless as they can't be related to anything .
If your hole areas are 30/20/50% of inducer then they're workable, changing hole areas generally only makes things worse .
Collect temperatures at 5-10-15-20-25 psi P2 , they will display trends, generally coolest at 10 psi and getting hotter at 5 psi and 15psi upwards
If you have 650C at 10 psi P2 with an open exhaust , then theres a problem that will need looking at as temps should be down ~450-500 C , at 650 C the turb wheel should be starting to show some "colour" if you look up the pipe during operation , if its still looking "grey" then the thermocouple might be misreading
Cheers
John
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Post by azwood on Sept 20, 2018 6:57:42 GMT -5
Theres no point doing anything until you collect data that includes temperatures vs pressures . Currently you have "highish" temperatures , but on their own they're meaningless as they can't be related to anything . If your hole areas are 30/20/50% of inducer then they're workable, changing hole areas generally only makes things worse . Collect temperatures at 5-10-15-20-25 psi P2 , they will display trends, generally coolest at 10 psi and getting hotter at 5 psi and 15psi upwards If you have 650C at 10 psi P2 with an open exhaust , then theres a problem that will need looking at as temps should be down ~450-500 C , at 650 C the turb wheel should be starting to show some "colour" if you look up the pipe during operation , if its still looking "grey" then the thermocouple might be misreading Cheers John Ok thats interesting theres no glowing turb wheel not even close i must need a new egt gauge you can see the wheel in the vid for a little i had been running for a good minute or so at that point.and yeah i spent a lot of time on the 30/20/50 rule down to the last mm so it shouldn't be a problem. |
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Post by azwood on Sept 24, 2018 21:26:40 GMT -5
I heard the free power should be 5 times the area of the exducer is that correct  |
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Post by racket on Sept 25, 2018 0:13:14 GMT -5
Nope , probably twice is enough, but it'll depend on the available "energy" exiting the gas producer, also its the flow area rather than actual size as an axial wheel can have varying ratios of flow area to wheel area, short blades vs long blades ...............we need to "work the numbers" to determine the flow areas required in the NGV and wheel.
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Post by azwood on Sept 25, 2018 1:15:52 GMT -5
Nope , probably twice is enough, but it'll depend on the available "energy" exiting the gas producer, also its the flow area rather than actual size as an axial wheel can have varying ratios of flow area to wheel area, short blades vs long blades ...............we need to "work the numbers" to determine the flow areas required in the NGV and wheel. Ok was just trying to understand the principal of it.i hope to do some more testing soon with all gauges in place ive changed a few things about and made a few better gaskets so hopefully next test will go better no leaking flanges and better tot's fingers crossed. |
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650c without nozzle?
