Kuznetsov Engine Projects

Vasily41

Vasily41

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Is there any information, specifications, and/or pictures of some of these engines?

TV-2 turboprop
NK-4 turboprop
P-8 turboprop
NK-6 turbofan
NK-10 (turbojet?)
P-4 turbofan
NK-15 turboprop
 
Trident said:
TV-2, NK-4 and NK-6 are covered in this series of articles on the history of Kuznetsov:



The NK-15 designation ended up with a rocket engine (the predecessor of the legendary NK-33), are you sure it was used for a turboprop?
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Positive it was a turboprop. Tony Butler lists the Beriev Be-26 amphibian's power plant as a NK-15 with 12,000+ shp.

Edit: a data sheet of the Be-26 reveals it had the NK-12MV. Maybe Tony accidentally typed the wrong number.
 
Kuznetsov P-8
Development: Project in context of the order "Strategic supersonic bomber" 07/1954, no connection to the turboprop project NK-8, certainly also none to the turbofan NK-8.
Use: Planned on Tupolev 108 (as alternative)
Type: Turbo jet screw engine ("RVD": differed from the normal "TVD" by the large proportion of the thrust of the gases from the jet nozzle in the total thrust)

Source: РИГМАНТ, В.: Под знаками „АНТ“ и „Ту“. Авиация и Космонавтика 1999, 3, p33 - 43.

Thanks to H. B. (1941 - 2018)
 
The NK-10 was a low-bypass 2-spool turbofan developed from the NK-6. Reheated thrust 235.3kN, fuel consumption 1.4-1.6kg/kgf/hr, project from 1958 proposed for the Bartini SBR, Myasishchev M-70 and the Tu-106.
A related project was the very similar NK-10B proposed for the Myasischhev M-56.
 
Boxkite,
regarding the description of the Kuznetsov P-8 in your posting #4 - what does "turbo jet screw engine" mean? Is it a turboprop configuration?
 
Basil said:
Boxkite,
regarding the description of the Kuznetsov P-8 in your posting #4 - what does "turbo jet screw engine" mean? Is it a turboprop configuration?
Click to expand...

It’s just a translation error. Screw is another (far less used) name for a propeller and turbo jet is turbojet. A flawless translation would most likely read turbo-propeller engine.
 
Basil said:
So the Tu 108 would have been a supersonic bomber powered by turboprops? This is unique in the history of aviation.

Is it this project?
Click to expand...

Yes, but those are P-4 (NK-4?) turboprops. And it’s not really a bomber, but more of a composite bomber mated with Tupolev ‘Aircraft 100’. There was a bomber version of ‘Aircraft 108’, but it had turbofans instead.
 
Do you have any any performance parameters for the NK-4 and P-8 turboprops? The Tupolev 'Aircraft 108' is mentioned in the book about soviet secret bombers (by Buttler / Gordon) but there is no detailed information about the turboprop variant which shows a typical transsonic / supersonic layout with its delta wing, area ruling and Kuechemann carrots. It is amazing Tupolev investigated a supersonic design using turboprop engines. For sure it would have needed supersonic propeller profiles.
 
So the NK-4 cannot be the proposed propulsion for the Tupolev Aircraft 108. Is there information available about the turboprop of the "Aircraft 108"?
 
The P-8 isn't the NK-4. The P-8 was a Kuznetsov study for more fuel efficient engines. The P-8 'RVD' is probably better translated as a "propjet", it was hybrid between a turbojet and a turboprop with more emphasis on the jet thrust component than a standard turboprop. Its not a million miles from an unducted fan engine. There was also a turbofan version of this engine. Other engines explored included Mikulin AM-17, Dobrynin VD-5M and VD-7M, and Klimov VK-9F.

The entire 108/100 system was a hybrid bomber, and the 108 was the carrier for the 100. Two mission profiles were envisaged, a strategic one where the host aircraft flies at 900-1000 km/h and a supersonic one at 1500-1800km/h. I would imagine the 'propjet" was optimised for efficiency at the 900-1000km/h profile.

As part of these studies, engine cycles and layout were optimised and later versions had NK-6 engines and a low swept wing.
 
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Thx for clarification. The P-8 RVD would have been an interesting engine.

In comparison with western turboprop engines with their lower flight speed spectrum the Kuznetsov NK-12 of the Tu-95 Bear also has a higher exhaust thrust proportion.
 

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