joolsned
Member
Joined: October 2012
Posts: 36
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Post by joolsned on Oct 26, 2012 4:20:12 GMT -5
I have been considering my options with the turbine, as its just the core I will have to sort out an oil supply and the fueling. The oil system is not a huge problem as I will run 2 electric pumps, a supply pump for the front and rear bearings and a higher flow scavenge pump to remove the oil and return it to the tank.
The fueling im still trying to work out, probably a bleed back system. The big headache is overspeed control and im at a loss at the moment as to how im going to achieve that. ( there is no FCU or governor with this engine). The injection system is interesting as fuel is sent through the center of the shaft and is centrifuged off the end of a rotating disc on the back side of the compressor wheel. Im not sure how this centrifuging will have on the fuel control system, but I suspect as the revs increase it would start drawing the fuel through faster........... any thoughts ?
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Post by racket on Oct 26, 2012 23:20:35 GMT -5
Hi Jools
With your fuel control maybe a "displacement" pump that has its rpm controlled electronically
so that you only feed the engine what it requires and any "suction" from the centrifugal distribution shouldn't have any effect .
Cheers
John
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joolsned
Member
Joined: October 2012
Posts: 36
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Post by joolsned on Oct 31, 2012 5:23:51 GMT -5
I have managed to get hold of a Palouste fuel pump complete and unused, just waiting for it to arrive now. I also got hold of a manual showing how the core is assembled, so things are getting there
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joolsned
Member
Joined: October 2012
Posts: 36
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Post by joolsned on Nov 6, 2012 14:07:28 GMT -5
The fuel pump arrived, what a monster probably weighs 15 lbs or more, (Im trying to keep the weight as low as possible) and I have counted 9 pipe connections and have no idea at the moment where they connect. I may have to use an electronic pump and make my own system. The centrifugal suction problem may be solved with a vane or eccentric pump as there would be no direct flow between the fuel tank and the pump output
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Nov 6, 2012 19:18:28 GMT -5
why not a bosch fuel injector pump?
they are an old and highly reliable design, you can find them in any auto parts store or online
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joolsned
Member
Joined: October 2012
Posts: 36
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Post by joolsned on Nov 7, 2012 4:30:46 GMT -5
I have a Bosch fuel pump, but it flows straight through, so not a suitable design for this engine
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Nov 7, 2012 17:45:57 GMT -5
how much fuel pressure do you need?
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joolsned
Member
Joined: October 2012
Posts: 36
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Post by joolsned on Nov 8, 2012 4:14:18 GMT -5
Hi I dont think it needs very much pressure at all, a couple of pounds over the combuster pr at the most but plenty of flow. I read a story on the net that someone fired up one of these engines with just a gravity feed from the tank and it ran ok. Im starting to wonder if one of these programmable fadecs from xicoy electronics would provide the fuel and speed control, although I know very little about the product other than what I have seen on that site
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on Nov 8, 2012 17:50:12 GMT -5
I just have difficulty understanding why a automotive EFI fuel pump and a bypass regulator with a servo attached to it for control won't do what you need...
Then again I didn't exactly make the entire fuel system very clear by only suggesting the pump...
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