MRT-02 new turbine project (ideas and suggestions?)

[racket]

Hi Patty

Theres heaps of Papers on the Net , this one is interesting

dspace.unimap.edu.my/dspace/bitstream/123456789/16295/1/combustor.pdf

Papers by Lefebvre are pretty good , he's the "godfather" of turbine combustion

Cheers
John

[miuge]

Let's see if we could get this project started this year. I'll be ordering the HX82 turbine and billet comp wheel in few weeks when I'm coming back from vacation.
Anders', Andy's and John's projects have been so motivating to watch that I have to get my own finally.

Nowadays I've got a good chain of suppliers to make all the necessary bits needed; CNC machining, cutting, bending, ceramic coating and 3D printing. Would like to take a full advantage of them.
Lately I'm interested in composite structures too and was thinking to make a comp cover and outer casing using carbonfiber. How about making a comp diffuser from carbon too? Just a thought..

The gas producer will be a "micro RC" -type, I've ditched ideas about turbo and turbo CHRA based builds already, and a bike frame will be built around it

[Johansson]

Now we are talking!

[miuge]

Has anyone used these diesel engine manifold flame heaters as an evaporator pre-heater for turbines? Around $35 shipped, 9.5V and 11V versions available.

www.youtube.com/watch?v=NeDvCVS38hk

[racket]

Love the vid .

I've got one of those Iskra units but haven't tried it as its a bit hard sourcing the fuel inlet fitting

Cheers
John

[dieselguy86]

Have 2 24v ones on my twin turbo v10 deutz engine, work extremely well, i believe its just a compression fitting, not sure of the size though, somewhere around 4mm or so.

[racket]

Thanks for that , I'll do a bit more searching .

[miuge]

The idea of a new project has been idling, but some relevant news. Me and a friend of mine established a new company in machining business and we ordered a brand new DMG Mori universal CNC turning machine.
It's a CLX450 with counter spindle and Y-axis, capable of making pretty much all the parts needed for a RC type gas producer   I think if only I've got some spare time I'll finally start realizing the idea.

I'll be needing help with the calculations for comp diffuser and turb NGV. Still thinking to stick with the HX82 bits I was inquiring earlier.

[turboron]

miuge, what was the cost of your CLX450?

Thanks, Ron

[racket]

LOL......I want one :-)

Bummer , I'd need to learn how to use it :-(

Yeh , stick with the HX82 bits .............and find some spare time to build your dream engine .

[jetjeff]

Hi,

Nice machine. The machine shop I work at doesn't have anything that new.

FANUC controller?

I'm with John, I don't know G code, but I think I can find the G spot,,,LOL.

Regards

Jeff

[miuge]

Ron;
It's almost 3 times the price of a HAAS equivalent, told by the sales guy.. and well Mazak would have been even more expensive.

John;
Nah, it's the computer that makes all the work nowadays, all you need to do is transfer the files and add material into the machine
G-Trim wheel is on the list.

Jeff;
We chose Siemens 840D instead of Fanuc control.
LOL


Edit: Specs of the turbine shaft considered for the build; 112/129mm 11-blade, Part No. 3521034 appears to be clipped one, 3524031 was found from a UK site sharing the same dimensions but no further info whether it's clipped or not.

[racket]

Hi

Andy M is using the #3521034 wheel in his build jetandturbineowners.proboards.com/thread/1025/hx-102-255-money-pit , he's the guy to keep in touch with during your build .

Cheers
John

[miuge]

Let's say we'd be using a 106mm comp / 112mm turb rotating assembly with journal bearings, what kind of power and rpm requirements for a electric starter? I'm leaning towards a RC brushless motor and if I'm not totally mistaken +20 000rpm would be needed to bring it up on idle.

70120 680kv @48v = 32 640rpm (a huge lump with high power and rpm)
70120 480kv @48v = 23 040rpm (a huge lump with high power and torque)
5692 980kv @36v = 35 280rpm (slightly smaller lump with plenty rpm)
5692 730kv @36v = 26 280rpm (slightly smaller lump with plenty torque)

As a battery Li-ion would be the way to go, I built a 72V 12Ah Samsung battery for my e-bike last summer, weighs less than 4kg in total. Very easy to make with the right tools and you can basically make any shape you want.

[racket]

Hi Miuge

I'm using a 12V 1.4Kw Nippon Denso auto starter running on 24 volts for the 12/118 engine , with 30,000 rpm capability from the stepup gearbox before disengaging the starter .

On the 10/98 engine I used a similar starter motor but without the stepup gearbox just straight off the end of the armature , it probably only gave ~20,000 rpm with the power dropping off as the armature was at max "no load"rpm

25,000 rpm would be a minimum rpm , preferably 30,000 capability for your build just to have a bit of buffer in case of unforeseen "problems" , 3Kw and 30,000 rpm should do the job , so the "smaller" 5692 might be adequate

Cheers
John