Jumo 004

[kool kitty89]

No, no, no... That's only the comprossor rotor blading, the stators are stationary and go after each rotor. The stators guide the airflow into the next stage. The stators and intake guide vanes are all stationary, the stators being contained in 2 halves of the casing which surrounds the compressor.


Almost all the sucessful turbojet designs up to the mid 1950's were single-spool.


And the arrangement of a contra-rotating 2-spool design you refer to, with no stators and every other stage turning in the opposite direction doesn't exist on any real world example to my knoledge. (I think there may have been some such designs considered in the WWII timeframe but they were abandoned)

Modern 2-spool engines (and those investigated and tested by the Germans in WWII) have 2 seperate compressor sections (one ahead of the other) running at different speeds, each powered by one or more individual turbine. (various designs rotating in the same or opposite direction, though I believe running in a single direction is more common)

[kool kitty89]

Here's a generic, basic example of the layout of an axial compressor:

[HoHun]

Hi Valengo,

>One of my (unfinished) projects in 3D Studio is the Jumo 004, here goes a view.

Wow, that's a very good overview - much better than the 2D sections they had at the museum!

I wish I had taken more photographs ... here are three more, showing the exhaust cone actuator, a view of the actuator and the actuating shaft leading to the exhaust cone, and the Riedel starter engine.

The exhaust tract seems to be different from the one in your 3D model, but maybe that's because the engine I've photographed is a Jumo 004A, not the more typical Jumo 004B ...

Regards,

Henning (HoHun)

[HoHun]

Hi again,

Here the exhaust cone actuator and the actuating shaft leading to the exhaust cone, viewing in an aft direction ...

Regards,

Henning (HoHun)

[HoHun]

Hi again,

Here the Rieder starter engine ...

Regards,

Henning (HoHun)

[kool kitty89]

I agree about the exaust section of the model, the struts look way off.

At least in alt the images I've seen of the 004B's exhaust there are 6 struts and they taper straight back (not curved like in the CGI immage) and are shorter inlength (how far they extend down the exhaust front-back wise).

see: http://www.enginehistory.org/German/...2_Engine_2.pdf (pg 32 and 36)


And a cut-away of the exhaust:

[kool kitty89]

Here's a picture of the compressor section exposed with the open casing half with stators visible above it:




This shows the compressor with stators in place with a peice of the casing removed. Albeit only the -gold colored- rotor blades are visible -only the -silverish- outer ring/sleeve of the stator sections are visible.



A lot of good pics here: John's Web Page

this one showing the compressor with part of the stators cut away:



A lot of pics here too: Jumo

[kool kitty89]

Another generic view of an axial compressor:


and wikipedia's page on them: Axial compressor - Wikipedia, the free encyclopedia


Note though that the 004 uses impulse blading for its stators which is somewhat different in apearance than that immage.
As discribed in the .pdf article on the Jumo 004 I've referred to, the 004's stators act primarily as guide vanes to correctly orient the air flow into
the next rotor and imparts little additional compression. (unlike reaction blading used on Heinkels HeS 30 -109-006- which acheived 50% of compression at
the stator)

[red admiral]

And the arrangement of a contra-rotating 2-spool design you refer to, with no stators and every other stage turning in the opposite direction doesn't exist on any real world example to my knoledge.

The only example I'm aware of is Griffith's CR.1/2 which is a high bypass ratio turbofan in double reverse flow arrangement with 22 individual compressor and turbine stages. Essentially the air is passed through the contra rotating compressor stages on the inside towards one end where it enters the combustor and turns through 180° before exhausting along the outside through the turbine. The turbine blades are attached to the ends of the compressor blades. It was built in 1940 and did actually work to some extent.

Most two spool designs don't have contra-rotating LP and HP spools. The only one that springs to mind is the Pegasus which uses this to get rid of gyroscopic effects.

A good source for the 004 is an article in ASME Journal of Gas Turbines and Power Vol 122 pp 191-199 which actually has technical details.

[jerryw]

Originally Posted by HoHun

Turbine wheel of the Jumo 004

Is this photo a turbine wheel from a JUMO 004?
References I have state that the 004 turbine had 61 blades, this one has 79!
Also, the drawings and photos I have show the turbine disk to be solid, this one has a large hole in the middle!
Finally, I can't find any reference suggesting that the turbine blades in the 004 were attached by "fir tree" type roots. Most drawings show lug extensions held by pins.
If this turbine wheel is from a JUMO 004, then there must have been some considerable modifications from the first models.

[HoHun]

Hi Jerry,

>Is this photo a turbine wheel from a JUMO 004?

Yes, but from Jumo 004A-022 - one of the very early engines that differed considerably from the later Jumo 004B series engines.

Regards,

Henning (HoHun)

[mkloby]

It's amazing that these engines do not look too much unlike the engines in the beasts we fly today.

[HoHun]

Hi again,

Here is another shot of the Jumo 004A at Laatzen ...

Regards,

Henning (HoHun)

[ground_level_bomber]

is it posible to mount the jumo 004 to the airframe of a me 109.will the mounting hold?. i have seen a picture of one. working all night makeing a model of that plane.

[Micdrow]

Added yet another document on Jumo -004 from cockpit insturments for those that wish to download from here.