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Post by racket on Mar 19, 2022 19:43:33 GMT -5
Hi
Your propane cylinder may have a "safety" device to prevent large amounts of discharge , and your sized turbo will need "large amounts" , some countries have these "safety??" devices
Cheers John
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Post by racket on Mar 17, 2022 19:27:58 GMT -5
OUCH !!!
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Post by racket on Mar 17, 2022 17:41:39 GMT -5
Hi Andy
You've been standing at the lathe for quite a while carving out that stainless piece , stainless makes beautiful bits , but its so slow to turn up .
Engine progressing nicely :-)
Cheers John
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Post by racket on Mar 17, 2022 17:37:41 GMT -5
Hi Scott
Yep , fuel prices are up :-(
Petrol was at $AU2.02 the other day when I filled the test stand tank , thats ~1.13 Pounds per litre .
LOL..............I'll have to be quicker with the testing ;-)
Cheers John
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Post by racket on Mar 17, 2022 3:21:22 GMT -5
Hi
That was creative :-)
You'll need a different system with kero , a hollow cone pattern spray nozzle is prefered , kero is a very different fuel to propane , its much more difficult to get "right" , and unless you want to spend a lot of development time on it , probably better to go with a conventional setup, we need fine atomisation and good fuel/air mixing .
I'll be looking forward to seeing her fired up on kero :-)
Cheers John
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Post by racket on Mar 14, 2022 20:41:32 GMT -5
Hi Scott
Now we've got some guts in the pump , its screaming a bit , but she'll flow 7,800 ml/min through the injectors at 80 psi supply pressure , previously with 2 X 044 pumps I could only get 4,300ml/min at 76 psi with the dump closed , with the single pump on 24V theres still more to give as the dump wasn't closed ..............LOL, or even close to closed :-)
Another test run in order methinks
Cheers John
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Post by racket on Mar 14, 2022 15:58:09 GMT -5
Hi
Its "complicated" :-(
Everything is connected , you lower the fans pressure ratio by increasing the flow whilst maintaining the same horsepower requirement from its turbine wheel , BUT , because the fan "turbocharges" the core engine the lower fan "boost" will reduce overall engine performance , all the other components within the engine will need to be changed to accomodate that .
Your engine is a "complete package" , it is what it is , a missile engine , as Monty put it so well , easier to start with a clean sheet of paper and design a new engine .
Cheers John
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Post by racket on Mar 14, 2022 3:30:35 GMT -5
Congratulations :-) So what was required to get it running ?? Its a fairly large turbo to run on gaseous propane , time to get some liquid fuel into her . With your lubrication , it might pay to check out the relevant info here jetandturbineowners.proboards.com/thread/680/diy-turbines just click on the icons . Cheers John
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Post by racket on Mar 13, 2022 16:42:14 GMT -5
Hi Scott
Yep , you're spot on , I found the unit had been set to maximum , duh :-( ..............I must have accidently set it whilst reinstaling the engine .
24 V pump testing on the cards for today , just a single pump unit should surfice , I'll hook it up to the 24V starter pack , I do have a 24V PWM unit, from the 12/118 development, that I could use , I'll see what I can come up with :-)
Cheers John
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Post by racket on Mar 13, 2022 16:36:02 GMT -5
Hi Mark
I did a series of insitu tests yesterday , with and without the lube pump operating, and theres more than enough pump output , only an ~3% drop with the lube pump on , I'll check other things today .
Thanks for the offer but the current setup should be more than adequate , nice pump though , good for some high pressure spraying :-)
Cheers John
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Post by racket on Mar 12, 2022 17:14:12 GMT -5
Hi Mark
The run itself went OK , fired up without the need for propane preheat , but I must have "done something" to the TOT setup as the temp didn't vary , theres too many options on these electronic thermometers , all I want is the temperature at the thermocouple , I probably "adjusted??" the settings , I'll have a look at it today and get the blowtorch to the thermos to check them out .
That bouncy gauge measures the static pressure ~10 mm in front of the inducer tip , theres a 1.1mm hole drilled through the alloy that I have a syringe needle inserted into with some plastic tubing back to the "boost/vacuum" gauge , its only an old gauge I used on my turbo bike from the '80's and its needle doesn't read zero but its good enough to get an idea of whats happening , and that bouncing has me intrigued , I've watched it several times and the only conclusion I can come to is "surge??" or some weird shock waves off the tip .
Today I'll "calibrate" the other new gauges , the bigger one at the top measures pressure inside the flametube , its hooked up to the hot streak pipe , so I'll hook that gauge and the P2 gauge to a common supply to check if they are reading the same and theres no "correction" to be made .
The bottom right hand gauge is the NGV static outlet pressure , I'll check it against the P2 gauge as well as the flametube internal pressure.
Once I've got the numbers I can do some calcs .
My big disappointment was the fuel supply , I still can't get enough into the engine to get up to my 3 Bar P2 , 60 psi delivery pressure even with the two pumps isn't enough , ......work to be done to rectify this , I'll do some insitu flow tests first to get a datum to work from .
Otherwise I'm happy with the test even though no improvement in thrust , theres was only a mild glow at the turbine at full throttle , no visible flames , though the bright mid day sunshine wasn't good for filming .
I'll post more later once I get the numbers sorted :-)
Cheers John
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Post by racket on Mar 11, 2022 22:08:58 GMT -5
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Post by racket on Mar 10, 2022 0:23:05 GMT -5
Hi Guys Engine is back on the test stand and in the car trailer A few more gauges added Time to make up a fuel brew and charge batteries Cheers John
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Post by racket on Mar 9, 2022 21:48:51 GMT -5
Hi
Yep , a grossly oversized pump .
Theres a good chance you have cavitation problems with the pumps inlet , if it has 1" fittings then you need probably at least a 1" ID suction line between oiltank and pump .
There could also be a problem with your oil tank fittings , the suction pickup looks "undersized" as well .
Solution ................install a 1" nipple and tee piece at the oil pump suction inlet , have your pressure side bypass going to one of the tee sides and your oil tank supply to the other, this way your pump can suck through the large bore of the 1" nipple without restriction , the upstream tee being fed from both the tank and bypass will comfortably reduce any restrictions , you could add an oil cooler in the bypass line .
On the outlet side of your pump there might be some restriction feeding into the 1/2" Tee piece , it might also benefit from increasing in size , but try the suction side mods first
Cheers John
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Post by racket on Mar 8, 2022 22:46:03 GMT -5
Hi Joe
Yep , its a nice match :-)
There is an engine being built by a JATO Member using that rotor , thanks to your fortunate finding of that turb wheel .
Cheers John
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