NK-93 Turbofan

flateric

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And - yes, mighty NK-93 is there
 

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So what exactly would you call that, an ultra-high bypass engine or a ducted unducted fan? ???
 
Geared turbofan, as PW does, I suppose
 
flateric said:
Geared turbofan, as PW does, I suppose

Well not quite. In the geared turbofan the fan is still part of the engine itself where in this one we're looking at you've got seperate propeller/fan things attached to a turboshaft then enclosed in a shroud. I'd call it an ultra-high bypass ratio engine but it's not really that either. ??? CRISP here is generally what is considered a UHB. Ducted propeller? Ducted turboprop?
 

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Conceptually it is probably closest to CRISP. Unlike P&W's geared fan the NK-93 has two counter-rotating 'fan' stages, the first with 10 blades and the second with 8. It's interesting that the blades have such a narrow chord though, thanks flateric!
 

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What's the advantage/disadvantages in the following engines

1. Conventional high bypass turbofan with high pressure ratio

2. Geared-turbofans

3. Prop-Fans

4. CRISP
 
Most of the online literature describe it as a ducted propfan. I believe it's similar to SNECMA ducted contra-rotating propfan (http://www.flightglobal.com/news/articles/picture-snecma-future-engine-concept-revealed-213520/). I'm quite interested in the technical literature/papers and conference papers on this engine but a google search (in google translated Russian/Ukrainian) revealed nothing. Hoping forum members can help out. Thanks in advance!
 
Austin said:
Flateric what is the current status of the NK-93 engine ?
Never delivered promised results, effective dead.
 

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