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RB211-535E Combustion Question  
User currently offlineboeing767mech From United States of America, joined Dec 2000, 1024 posts, RR: 3
Posted (1 year 5 months 2 weeks 5 days 16 hours ago) and read 3171 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.

Thanks
David

[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, 31660 posts, RR: 56
Reply 1, posted (1 year 5 months 2 weeks 5 days 13 hours ago) and read 3131 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, 31660 posts, RR: 56
Reply 2, posted (1 year 3 months 2 weeks 1 day 12 hours ago) and read 2167 times:

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


Think of the brighter side!
User currently onlineferpe From France, joined Nov 2010, 2800 posts, RR: 59
Reply 3, posted (1 year 3 months 2 weeks 23 hours ago) and read 2011 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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