Kuznetsov NK-86 Turbofan engine

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The NK-86 turbofan engine was developed specifically for the Ilyushin Il-86 wide-body passenger aircraft.

The powerplant was developed from the NK-8 engine, with thrust increased to 13.000 kgf. The overall engine design remained largely similar to that of the NK-8.

Ilyushin Il-86 wide-body passenger aircraft.	Kuznetsov NK-86 Turbofan engine.

The two-shaft turbofan engine consisted of a two-stage fan and a three-stage low-pressure compressor (LPC) mounted on one shaft, as well as a six-stage high-pressure compressor (HPC), an annular multi-nozzle combustion chamber, a single-stage high-pressure turbine (HPT), a two-stage low-pressure turbine (LPT), and an exhaust system incorporating a lattice-type thrust reverser and exhaust nozzle.

The engine design pioneered the use of sound-absorbing structures, engine diagnostic monitoring systems, an analog electronic control system, and a compressor blade failure protection system. The NK-86 was equipped with single-crystal first-stage turbine blades made from ZhS-30/32 alloy. These blades enabled the engine to maintain constant takeoff thrust at ambient temperatures of up to +30°C.

Between 1977 and 1979, the engine entered operational service aboard Il-86 aircraft. Production ceased in 1987, with approximately 500 engines manufactured.

In the 1980s, the NK-87 engine was developed from the NK-86 for use on the Lun-class ekranoplan and Spasatel ekranoplan ekranoplans. To ensure reliable operation in marine environments, the engine design incorporated special corrosion- and heat-resistant coatings.

Technical specifications

Photos NK-86 turbofan engine