Airxliban From Lebanon, joined Oct 2003, 4491 posts, RR: 55 Posted (3 years 1 month 2 days 18 hours ago) and read 4017 times:
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?
tdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80 Reply 1, posted (3 years 1 month 2 days 18 hours ago) and read 4008 times:
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.
MarkC From United States of America, joined Apr 2006, 259 posts, RR: 0 Reply 2, posted (3 years 1 month 2 days ago) and read 3858 times:
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%.
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