Discussion on circumferential non-uniform temperature distribution and deformation in aero-engines

[Chaos2Max]

hello guys, im recently study the non-uniform temperature distribution and deformation in aero-engines(turbojet turbofan turboshaft), and the un-uniform deformation is a typical problem remains unsloved, but I cant find any material to learn from(for example, OTDF is a factor to define the temperature distribution of the combustion chamber outlet). so is anybody knows how to deal with this kind of problems? maybe we can discuss it?

 

[SWComposites]

i suspect this info is proprietary to the engine manufacturers

 

[WKTaylor]

Maybe some useful info in AIAA or SAE or documents/reports/standards...

SAE AIRxxx, ARPxxx, ARPxx, text books, published papers, etc. Example...
SAE AS681 Gas Turbine Engine Performance Presentation for Computer Programs
SAE AIR1419 Inlet Total-Pressure Distortion Considerations for Gas-Turbine Engines

AIAA has thousands of papers, every topic.

Bla bla bla...

 

[Chaos2Max]

i suspect this info is proprietary to the engine manufacturers

Thx~ but its also a problem related to manufacturers, but the contribution is not so significant. you know for turbine casing, due to the circumferential non-uniform temperature distribution(high temp gas and maybe ACC) the deformation is the non-uniform. which will lead to non-uniform tip clearance, you cant just evaluate the performance of your engine with a single 1D valve of Tip Clearance. you need 3D INFO~

 

[Chaos2Max]

Maybe some useful info in AIAA or SAE or documents/reports/standards...

SAE AIRxxx, ARPxxx, ARPxx, text books, published papers, etc. Example...
SAE AS681 Gas Turbine Engine Performance Presentation for Computer Programs
SAE AIR1419 Inlet Total-Pressure Distortion Considerations for Gas-Turbine Engines

AIAA has thousands of papers, every topic.

Bla bla bla...

YES Taylor. i've search those website, not much useful information.

 

[rb1957]

Have you answered your own question ?

I'd've thought that engines were very susceptible to even small loads, but if this is a thing that OEMs don't worry about, then why you ?

I'd've thought (like SWC) that OEMs did worry about this, and do so in a proprietary manner, so you may not find open sources on this.

I'd've thought that OEMs worried extensively about thermal effects (the the impact of these effects on the small clearances inside the engine.
Now maybe the combustion chambers massively overrule other thermal effects (like temperature rise due to compression).

Maybe you can explain your problem some more ... "the non-uniform temperature distribution and deformation in aero-engines". Are you looking at the engine shaft specifically ? A multi-shaft engine ??.

In my ignorance I'd expect that the combustion chambers are the biggest heat source, and the engine gradually heat soaks as it runs for several hours.
But outside air is at something like -30degC, so there's a bunch of thermal modelling going on.
So by "non-uniform temperature", do you mean some of the shaft is feeling the combustion chamber temp and some other parts are feeling the outside air ?

 

[jaceb]

what you are asking for is strictly controlled, properietary information, part of specific DPs, directly related to engine performance - you will have no access to this untill you will be a member of inner circle of trust at GE, PW, RR or Safran.... not just emplyee, but you have to work for a team which has access to this type of information on "need to know" basis