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RB211-535E Combustion Question  
User currently offlineboeing767mech From United States of America, joined Dec 2000, 1037 posts, RR: 2
Posted (3 years 4 months 1 week 1 day 11 hours ago) and read 4384 times:

So I have been doing boroscopes for a while and have noticed the higher time RB211-535E's have damage to the HPT (high pressure turbine blades) at the blade root trailing edge. Nothing to get excited about most of the time because it is within maintenance manual limits. But what is causing this damage on the roots when the noozle guide vanes in the combustion section have little or no damage????

HPT notice the dark area of the blade, (lower left corner of picture) this is the area of damage

Typical damage of high time engine of HPT

If anyone has any insight or knowledge of this I would be curious to understand the cause of damage to just this area and not the whole blade.


[Edited 2013-01-21 08:35:54]

Never under-estimate the predictably of stupidty
3 replies: All unread, jump to last
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 1, posted (3 years 4 months 1 week 1 day 8 hours ago) and read 4344 times:

Im curious why the root end "Trailing edge" not the "Leading edge".

Think of the brighter side!
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 2, posted (3 years 2 months 4 days 7 hours ago) and read 3380 times:

Anyone Aware......of the reason.

Think of the brighter side!
User currently offlineferpe From France, joined Nov 2010, 2809 posts, RR: 60
Reply 3, posted (3 years 2 months 3 days 18 hours ago) and read 3224 times:

If you look up the CFD simulations there are on the net of the standard type turbine airfoils (2D) and the new ones designed with 3D CFD software you can see the standard ones have a highly vorticiced area at the roots. So the cause might be shedding of high energy local vortices which gradually erode the root area at the trailing edge, those dark eroded areas seems to be at the right place for that.

It shows why modern engines are more efficient, you get the transfer from gas energy to shaft hp to be more loss free.

Non French in France
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