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Post by racket on Apr 22, 2013 4:13:18 GMT -5
Hi Erik
Mmmm, your turb's 77.7mm exducer is ~47% bigger in area compared to the comp's 64mm inducer, thats a lot ..................do you have a turb scroll A/R number , its generally cast into the scroll near the rectangular inlet flange , it looks like the turb scroll is fairly "fat" compared to the comp scroll.
Cheers John
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on Apr 22, 2013 4:24:15 GMT -5
Hi John
Here are the data:
Compressor scroll A/R: 0,72 Turbine scroll A/R: 1.34
Cheers Erik
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Post by racket on Apr 22, 2013 4:49:24 GMT -5
Hi Erik
Yep , she's oversized , you probably only need an A/R of ~1.0 with that sized comp inducer .
You've probably got a severely choked compressor stage with comp efficiencies below 60% , maybe even 55% , your T2 readings will soon indicate what it is , fit the T2 pickup in the delivery tube between turbo and combustor .
At minus 10 deg C ambiant you'd have a T2 of ~127 deg C at 60% effic , and ~140 deg C if 55% effic with your 1.6 bar P2 .
At 0 deg C ambiant ......143 deg C at 60% and 156 deg C at 55%
This would account for your "large" fuel flow rates etc
Cheers John
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Post by stoffe64 on Apr 22, 2013 11:50:55 GMT -5
Hi Eric You could try water injection to fill out the turbine or even water metanol mix Cheers Stephan
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Post by stoffe64 on Apr 22, 2013 12:25:41 GMT -5
Hi Eric,i intend to usel a piusi viscomat pump,its specs are max pressure 5,5bar and max flow 11,5 liters per minute, Howard Long Will you run your engine, i intend to run it for short whiles only, but i believe it Will Do its work You Can always lok at the pump Anders is using,its called Marco Cheers Stephan
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nersut
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Joined: September 2012
Posts: 223
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Post by nersut on Apr 23, 2013 21:11:31 GMT -5
Hi John I used Loctite 5926 blue silicone sealant to prevent air leakage from the end cap. I hope this works I will try to mount a adjustable fuel pressure regulator to regulate the oil pressure to the recommended 4.6 bar (Garrett data). I want to mount it so I don't have to adjust the oil pressure "constantly" according to P2 pressure & oil temperature. I found a used Holset HX50 turbocharger from a Scania DC 11 engine that I could buy from a local truck company. It should flow 0.75kg/sec. of air (Holset data) Is this turbo suitable for DIY gas turbine? I was looking for information on water injection & I for this: 0.6 water-to-fuel ratio or 1.15 % of total air flow (for a typical heavy frame gas turbine) Have anyone tried water injection on DIY gas turbine? Hi Stephan I am surfing around to find a suitable oil pump, want a 30+ min. duty & minimum 5 bar pump. Cheers! Erik
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Post by racket on Apr 23, 2013 21:58:23 GMT -5
Hi Erik
you could try pumping a couple of litres per minute of water into your engine via a fine spray either at the comp inlet or directly into the combustor .
The HX 50 will only efficiently flow ~0.5 kgs/sec , at 0.75 its running at 60%
Cheers John
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Post by stoffe64 on Apr 29, 2013 2:45:52 GMT -5
hi Erik!
i believe that both the PIUSI VISCOMAT 12VDC 60/2 and that MARCO pump that Anders use would both be suitable for even your use, the piusi can run for 30 minutes and i believe that the Marco pump had a 30 minute cycle as well, they both are rated for 5 bar pressure with plenty of flow, i dont beleve that you find any other pump with better specs running on 12vdc i remembeer a place who sold 12vdc pumps designed for turbo scavenge duties but its max pressure was only 40psi and it was qite costly...i will try to find that link for you Erik. cheers/stephan
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Post by stoffe64 on Apr 29, 2013 2:57:00 GMT -5
hi Erik! i found that link to that turbo oil scavenge pump,there are 3 different versions of them but i believe that the one you would be interested in is the super model with a cost of 430 us dollars they can be fitted with AN couplings and such,i hope it is to any help for you! cheers/stephan www.rbracing-rsr.com/oilsystems.htm
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on May 7, 2013 0:02:27 GMT -5
Hi Stephan I ordered a brand new Shurflo pump, 8000-443-136 from eBay for 75 USD. Data: - 12 VDC
- 40-60 PSI adjustable pressure switch
- 1.8 GPM flow
- Santoprene® diaphragm
- under 90W power draw
But the internal valves are EPDM-type (white) which are not suitable for oils so I also ordered Buna-type valves (black). My current oil system is too bulky, heavy & draws a lot of current with the 600W/220V handheld drill/Power steering pump setup & 15 mm copper tubing. I can't go out and test/run my turbine at the time because the weather sucks ... snow & up to 50 m/sec. winds! Springtime feels like winter up here in the arctic. Cheers Erik
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Post by stoffe64 on May 7, 2013 17:31:13 GMT -5
Hello Eric I am a bit surpriced that you selected the shurflo pump,i intended once to use that pump myself But decided against it because it was som cases where it was a bit to small to handle a proper Oil flow at the apropriate pressure, it was more suitable for a small turbo But there were problems for som with bigger turbos such as truck turbos,i think that Anders selected that marco pump just because of this,atleast thats why i selected the piusi pump myself,But then again it might work perfectly for your setup Only trying Can Tell that fact. Cheers Stephan
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nersut
Veteran Member
Joined: September 2012
Posts: 223
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Post by nersut on May 21, 2013 6:39:43 GMT -5
Hi folks! Yesterday I did some test runs with my FJK-2(B). The silicone sealant helped a lot, no more leaking end cap. I was using a portable generator to run the electrical units. The generator must have a lower voltage than a wall socket because my oil pump/drill was running a bit slow. I could only run my turbine for about a minute before the oil pressure begins to drop... My new Shurflo pump arrived but I am still waiting for the Buna valve I ordred. I hope the Shurflo can keep the oil pressure & flow better than my current drill/PS setup. I think the silicone sealant helped because the EGT has dropped to about 500-550 degrees Celsius at full power. I took a short video with my GoPro Hero 2 camera Cheers! Erik
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wolfdragon
Senior Member
Joined: April 2011
Posts: 287
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Post by wolfdragon on May 21, 2013 16:22:05 GMT -5
Plug in a regular light bulb or a halogen shop lamp and try again.
The drill motor is a 100% inductive load, by adding a resistive load to the equation you will give the generator windings something to push against. It doesn't need to be much more than 45W.
It's a alternating current -ism that occurs only with purely inductive loads, inverter type generators get REALLY unhappy very quickly, but since you have a small spinning genset, it just needs a bit more work to do to make good power.
I know it's counter intuitive but it works.
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Post by racket on May 21, 2013 19:51:53 GMT -5
Hi Erik
Progressing nicely :-)
Yeh , keep that oil pressure up .
Cheers John
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nersut
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Joined: September 2012
Posts: 223
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Post by nersut on May 22, 2013 0:16:53 GMT -5
Hi Wolfdragon
The resistive load sounds interesting. So should I put the load in series with the drill & just as a extra load on the generator?
Cheers Erik
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