Kuznetsov NK-12

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Kuznetsov NK-12 engines on an Antonov An-22
NK-12 engines on a Tupolev Tu-95

The Kuznetsov NK-12 ( Russian Кузнецов НК-12 ) is a from the time of the Soviet Union derived Turboprop -Triebwerk the Russian manufacturer Kuznetsov . Development began in 1952. With a maximum of 15,000 hp, the NK-12 is still the most powerful turboprop engine that has ever been produced in series.

description

It is a single-shaft engine that drives two coaxially opposing propellers via a double planetary gear . It was developed from 1953 in Kuibyshev by a group of engineers from the former Junkers works under the direction of the Austrian Ferdinand Brandner . The technicians were brought to the Soviet Union in 1946 together with numerous other aviation specialists ( Operation Ossawakim ).

Initial experience with counter-rotating turboprop engines was gained in the course of the development of the TW-2M turbine with its two counter-rotating three-blade propellers. This engine was intended for the Tupolev Tu-91 and was tested on a Tupolev Tu-4 . After the group had developed the 022 engine there, which was later to be used on a large scale as the Kuznetsov NK-4 in 4,000 and 5,000 hp versions, there was a need for a far more powerful engine. From November 1952, flight tests were carried out with the first prototype of the Tupolev Tu-95 with the twin engine 2TW-2F , which consisted of two coupled NK-4s. After the machine crashed due to transmission problems, it was decided to develop a single-turbine engine with the type designation NK-12 and initially 12,000 hp. The first runs on the test bench took place in 1953, the first flight in 1955 with the second Tu-95 prototype.

Applications

The engine in its various variants was used in the following aircraft:

The following unrealized projects would also have been equipped with the engine:

  • Tupolev Tu-115 (a cargo version of the Tu-114 with a tailgate and tailgate)
  • Tupolev Tu-118 (a modification of the Tu-104 with four turboprop instead of two jet engines)

Technical specifications

Variant → TW-12 NK-12 NK-12M NK-12MA MK-12MW NK12-MK NK-12MP
Power kW) 8,000 8,948
9,188		 11,185 11,033 9,900 11,030
Horsepower) 10,880 12,170
12,500		 15,211 15.005 13,464 15,000
Turbine speed (min −1 ) 8,300 8,300
Turbine inlet temperature (K) 1,150 1,150
compressor axial 14-stage
turbine axial 5-stage
Air flow (kg / s) 65
compression 9.7: 1
Propeller speed (min −1 ) 8,300 750
Weight (kg) 2,900
(without propellers) 		3,500
MTBO (h) 100 5,000
Weight (kg) 3,500
Length (mm) 4,837
Length (mm) 1,620

See also

Web links

Commons : Kuznetsov NK-12  - Collection of images

Individual evidence

  1. ↑ Jefim Gordon , Wladimir Rigmant: OKB Tupolev - A History of the Design Bureau and its Aircraft , Midland, 2005, pp. 146-148, ISBN 1-85780-214-4
  2. ↑ Fliegerrevue, magazine for aerospace, 10/2006 p. 23