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Breather Port - RB211-535E4  
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Posted (1 year 5 months 2 weeks 5 days 20 hours ago) and read 2902 times:

http://sphotos-d.ak.fbcdn.net/hphotos-ak-prn1/625577_10152762728955301_1669343527_n.jpg

The Breather port on the RR RB211-535E4 of the B752 has got small vortex generators on the lower end on either side and the bottom..
Anyone having any more data on this.


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7 replies: All unread, jump to last
 
User currently offlineCCA From Hong Kong, joined Oct 2002, 836 posts, RR: 14
Reply 1, posted (1 year 5 months 2 weeks 5 days 16 hours ago) and read 2861 times:

I'd guess it causes a swirling motion to keep the oil mist off the cowling, the drain mast alone doesn't do the job adequately.


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User currently offlineoly720man From United Kingdom, joined May 2004, 6754 posts, RR: 11
Reply 2, posted (1 year 5 months 2 weeks 5 days 15 hours ago) and read 2848 times:

I'm inclined to say that the vgs are to generate a "layer" in the flow to stop the ejected flow from the mast from smearing along the nacelle. I can't imagine any aerodynamic reason related to the mast itself.

As for the perpendicular tab, it may just be to guide the flow.



wheat and dairy can screw up your brain
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 3, posted (1 year 5 months 2 weeks 1 day 21 hours ago) and read 2596 times:

Makes sense....Anyone aware of the earlier breather ports not having these VGs and there after getting fitted on.


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User currently offlineNDWDCPGUY From Canada, joined Jan 2013, 9 posts, RR: 0
Reply 4, posted (1 year 5 months 2 weeks 1 day 6 hours ago) and read 2525 times:

Initially there was no vane. The oil/air mixture exited from a flush mounted grille on the cowl. Many of these cowls are still in use.

User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 5, posted (1 year 5 months 2 weeks 19 hours ago) and read 2460 times:

Quoting NDWDCPGUY (Reply 4):
Many of these cowls are still in use.

Do you have a reference to the concerned SB.



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User currently offlineboeingfixer From Canada, joined Jul 2005, 534 posts, RR: 0
Reply 6, posted (1 year 5 months 2 weeks 15 hours ago) and read 2433 times:

Quoting HAWK21M (Reply 5):
Do you have a reference to the concerned SB.

The Rolls Royce SB is RB.211-71-9088 dated 17 Dec 93.

Quoting HAWK21M (Reply 3):
Makes sense....Anyone aware of the earlier breather ports not having these VGs and there after getting fitted on.

As NDWDCPGUY said, the original breather was a flush louver on the cowl panel. The SB introduced the extended breather mast to keep the oil streaking on the fan cowl to a minimum. The small vanes on this new mast have been there since day one.

Cheers,

John



Cheers, John YYC
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 7, posted (1 year 5 months 1 week 5 days 16 hours ago) and read 2265 times:

Quoting boeingfixer (Reply 6):

The Rolls Royce SB is RB.211-71-9088 dated 17 Dec 93.

Thanks...I'll check it out....



Think of the brighter side!
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