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P&W F-100 - Variable Inlet Guide-Vane Questions  
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Posted (5 years 8 months 1 week 6 days 4 hours ago) and read 5873 times:

I remember reading something about the F100 having these variable inlet-guide vanes (in addition to the regular variable-guide vanes in between the compressor stages) which are designed to lower the pressure-ratio at high-speed.

Is this true?


BTW: If so, and assuming it's not classified, does it work incrementally adjusting as the speed goes up, or all at once, when a certain mach-number or engine/compressor temp is reached?

[Edited 2008-08-09 10:56:04]

8 replies: All unread, jump to last
 
User currently offlineNicoEDDF From Germany, joined Jan 2008, 1097 posts, RR: 1
Reply 1, posted (5 years 8 months 1 week 3 days 2 hours ago) and read 5755 times:

The information is you are searching for is classified!

User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 2, posted (5 years 8 months 1 week 2 days 21 hours ago) and read 5713 times:

Oh well,

Blackbird


User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 3, posted (5 years 8 months 1 week 3 hours ago) and read 5602 times:

No EEDF, it's not classified, not at all. It's a damn near 40 yr old engine.

They're first stage vanes, the very first stage of the engine is stators, and that's where they exist. They incrementally move more open as N1 and N2 come up, and are full open at mil power, I can't remember the exact full open point. They're scheduled by the DEEC (F-100-220/229)(On the F-100-100 that would be the EEC), and in case of DEEC failure and reversion to secondary mode, then they'll slam full closed..."better slow than blow" was what they said.

DeltaGuy


User currently offlineLarshjort From Denmark, joined Dec 2007, 1351 posts, RR: 0
Reply 4, posted (5 years 8 months 1 week 2 hours ago) and read 5601 times:



Quoting DeltaGuy (Reply 3):
No EEDF, it's not classified, not at all. It's a damn near 40 yr old engine.

If you didn't got it, I'm quite sure he was being sarcastic, with reference to this:

Quoting Blackbird (Thread starter):
If so, and assuming it's not classified,

/Lars



139, 306, 319, 320, 321, 332, 34A, AN2, AT4, AT5, AT7, 733, 735, 73G, 738, 739, 146, AR1, BH2, CN1, CR2, DH1, DH3, DH4
User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 5, posted (5 years 8 months 1 week ago) and read 5592 times:

So was NicoEEDF was joking or not?

I just want to make sure before I continue asking any questions relating to the F-100 Engine


Blackbird


User currently offlineDeltaGuy From , joined Dec 1969, posts, RR:
Reply 6, posted (5 years 8 months 6 days 16 hours ago) and read 5562 times:

He had to be joking then, there isn't much you can't talk about on that engine. Old news pretty much all the way about that engine.

DeltaGuy


User currently offlineBlackbird From , joined Dec 1969, posts, RR:
Reply 7, posted (5 years 8 months 5 days 17 hours ago) and read 5515 times:

I thought it used a variable inlet-guide vane system kind of like the J-58 (I'm not just talking about the J-58's that powered the Blackbird, but all J-58's to my knowledge, even the early designs pre-Blackbird era). Past a certain compressor inlet temp, the guide-vane would adjust position lowering the alpha of the airflow to the compressor effectively lowering the pressure ratio of the engine. The idea was that it would also lower the turbine-inlet temperature and at a high-enough speed you'd derive enough off ram-compression anyway.


Blackbird
Let's hope I don't get a heart-attack or something  Yeah sure

[Edited 2008-08-16 21:55:45]

User currently offlineNicoEDDF From Germany, joined Jan 2008, 1097 posts, RR: 1
Reply 8, posted (5 years 8 months 5 days 9 hours ago) and read 5489 times:



Quoting Larshjort (Reply 4):
I'm quite sure he was being sarcastic

Ja, det er rigtig!

Quoting DeltaGuy (Reply 6):
He had to be joking then, there isn't much you can't talk about on that engine.

Yes, indeed I was joking. Due to the never ending ...

Quoting Blackbird (Reply 7):
Let's hope I don't get a heart-attack or something



Quoting Blackbird (Thread starter):
and assuming it's not classified

...bla bla about things being classified, getting heart attack and so on in several threads I just couldn't resist.

All the more I really find your threads interesting, I just don't get this persecution mania you express in all your threads. But well, maybe I should give it a rest.


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