airxliban
Posts: 4285
Joined: Wed Oct 01, 2003 12:14 pm

Engine Hot Section/cold Section Modules

Tue Apr 20, 2010 7:40 pm

Hi all,

I need some help on identifying parts in the hot/cold section of the engine. This should be relatively basic for those of you in the know!

Am I right in saying that the hot section consists of the combuster, high pressure turbine and low pressure turbine?

And that the cold section includes the inlet, low pressure compressor and high pressure compressor?

I am also trying to estimate what percent of maintenance spend to allocate to each segment. Current data suggests 70% for hot section and 30% for cold section. Does that sound about right?

Thanks in advance for any help you can provide.
PARIS, FRANCE...THE BEIRUT OF EUROPE.
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: Engine Hot Section/cold Section Modules

Tue Apr 20, 2010 8:00 pm

Quoting Airxliban (Thread starter):
Am I right in saying that the hot section consists of the combuster, high pressure turbine and low pressure turbine?

Yes. Essentially, everything aft of the fuel nozzles (the little bit of the combustor ahead of the nozzles is included since it's all one part).

Quoting Airxliban (Thread starter):
And that the cold section includes the inlet, low pressure compressor and high pressure compressor?

The inlet generally isn't considered part of the engine, it's part of the nacelle. Everything from the fan case to the combustor is cold section.

Quoting Airxliban (Thread starter):

I am also trying to estimate what percent of maintenance spend to allocate to each segment. Current data suggests 70% for hot section and 30% for cold section. Does that sound about right?

That sounds about right, intuitively, but I haven't seen enough data to know if the numbers support that.

Tom.
 
MarkC
Posts: 238
Joined: Tue Apr 25, 2006 8:10 am

RE: Engine Hot Section/cold Section Modules

Wed Apr 21, 2010 1:46 pm

Depends upon the engine. On a very big engine the LPT gets very expensive with the huge airfoil count. So more than 70%. On a small engine, this is not so bad, so less than 70%. Of the cold section cost, the major portion of it is the high compressor. If it was not for that the cold cost would be more like 10%.

Mark
 
airxliban
Posts: 4285
Joined: Wed Oct 01, 2003 12:14 pm

RE: Engine Hot Section/cold Section Modules

Thu Apr 22, 2010 9:50 pm

Thanks chaps - appreciate the help. The numbers I was looking to validate were from a PW 4090.

Let me know if anyone is interested in a breakdown by HPC/LPC/Combuster/HPT/LPT/Case etc and I can provide those figures.
PARIS, FRANCE...THE BEIRUT OF EUROPE.

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