HPST 2020 Jet Engine

[racket]

Hi Scott

Gotta have swing for our sorta work , we might start off thinking the lathe is too big , but it can become too small eventually :-(

Cheers
John

[wannabebuilderuk]

Feb 5, 2022 20:48:14 GMT -5 racket said:

Hi Scott

Gotta have swing for our sorta work , we might start off thinking the lathe is too big , but it can become too small eventually :-(

Cheers
John

Tell me about it :/

[praendy2203]

[praendy2203]

Hi guys,

after some testruns I decided to build a new ngv.

The original KHD T 312 ngv is much too tight and the trailing edge angle only 18-20°.

Hope my friend will weld the 18 vanes this week and I have to lathe the 11 Kg stainless for the outer housing.
The outer housing will be slipped over the 18 vanes with a gap of 1/10 mm.
There is space for the vanes to expand and center the outer pipe.

Andy

[praendy2203]

[praendy2203]

Hi,

Three months ago I found an analog balancing machine, made in 1966.

Its able to balance both sides in one step and also balancing the inner sides of the bearings and the outer sides.

During shaft balancing, I found out, the shaft itself is out of balance.
Adding some knead and grinding the opposite side to "0" took some time, but it worked.

The machine has 4 gauges, 2 for the left pane and 2 for the right pane.
The gauges are devided in 2 sectors and showing the unbalance in a sector and how much it is.

For the left pane, for example, the upper gauge shows sector 1 and 3 and the lower gauge 2 and 4.

When all needles in the mid position, the balance is fine.

Up to a 4 Kg rotor is possible😄

So I have to build BIGGER engines!!!

Andy

[racket]

Hi Andy

NGV is looking good .

Bigger is better ;-)

Cheers
John

[ripp]

Hi Andy,

a suggestion for the NGV, if you shorten the wings so that there is a small gap, you can watch the combustion in the combustion chamber, is often helpful.



Here is a professional NGV from Jetmax.



Ralph

[jetric]

Shortening the wings as you suggest will alter the NGV throat area, so he may not be able to do this. Even if he leaves the NGVs as they are you should still be able to see through the throat gap if you stand slightly off to one side.

Richard S.

Nov 4, 2022 2:00:11 GMT -5 ripp said:

Hi Andy,

a suggestion for the NGV, if you shorten the wings so that there is a small gap, you can watch the combustion in the combustion chamber, is often helpful.



Here is a professional NGV from Jetmax.



Ralph

[praendy2203]

[praendy2203]

Hi,

much work done and some golden curls for the christmas tree😁

The ngv gives a sight into the combustion chamber.
If it's still too tight, then I can shorten the vanes, but for now I gave the vanes an aerodynamical profile at the trailing edge.

I guess from 11 Kg, 300 g for the ngv and still a piece 150 x 15 mm left👍

Andy

[racket]

Hi Andy

Lotsa "curls" , they scare the crap out of me when they climb off the tooling straight towards my face , alway happy when the stainless jobs are done :-)

A very nice part , can't wait to see how the engine performs .

Cheers
John

[ripp]

Hi Jetric,

I'm afraid you can't see anything, but we'll see.




Cheers
Ralph

[jetric]

Once the turbine wheel is rotating you will be able to see through it, then you can look at the correct angle through the gaps in the NGVs, obviously whilst its stationary you won't be able to see anything because of the angle of the turbine blades.

Richard S.

Nov 5, 2022 3:21:54 GMT -5 ripp said:

Hi Jetric,

I'm afraid you can't see anything, but we'll see.




Cheers
Ralph

[praendy2203]