Kuznetsov NK-25

1960s Soviet turbofan aircraft engine

NK-25

Type	Turbofan
National origin	Soviet Union
Manufacturer	Kuznetsov Design Bureau
Major applications	Tupolev Tu-22M

The Kuznetsov NK-25 is a turbofan aircraft engine used in the Tupolev Tu-22M strategic bomber. It can equal the NK-321 engine as one of the most powerful supersonic engines in service today. It is rated at 245 kN (55,000 lbf) thrust. The three shaft engine we call the NK-25 was designed in the years 1972–1974. It is made by the Soviet Kuznetsov Design Bureau.

Applications

Tupolev Tu-142LL^[1] (testbed)
Tupolev Tu-22M3^[1]
Tupolev Tu-22MR^[1]

Specifications (NK-25)

Data from motor-s.ru,^[2] Otechestvennaya aviatsionno-kosmicheskaya tekhnika - SAMARSKIY NTK^[1] and engine.aviaport.ru^[3]

General characteristics

Type: Three-spool low-bypass afterburning turbofan
Length: 7,300 mm (290 in)^[2]
Diameter: 1,770 mm (70 in)^[2] at the nozzle casing
Dry weight: 3,575 kg (7,882 lb)^[2]

Components

Compressor: 3-stage LP, 5-stage IP and 7-stage HP^[3]
Combustors: Annular multi-nozzle combustion chamber^[2]
Turbine: 4-stage axial turbine^[2]

Performance

Maximum thrust:
- 245 kN (55,000 lbf)^[1] wet
- 145 kN (33,000 lbf)^[2] dry
Overall pressure ratio: 25.9^[3]
Bypass ratio: 1.45^[2]
Air mass flow: 211 kg/s (470 lb/s)
Turbine inlet temperature: 1,597 K (1,324 °C; 2,415 °F)^[3]
Specific fuel consumption:
- 2.1 kg/(kgf⋅h)^[2] wet
- 0.58 kg/(kgf⋅h)^[2] dry
Thrust-to-weight ratio: 6.99 kgf/kg (31.1 N/lb)

References

^ ^a ^b ^c ^d ^e Otechestvennaya aviatsionno-kosmicheskaya tekhnika - SAMARSKIY NTK (in Russian). Samara, Russia: SNTK imeni N.D.Kuznetsova. pp. 42, 43, 77.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j "NK-25". motor-s.ru. Archived from the original on 2002-04-08. Retrieved 14 October 2021.
^ ^a ^b ^c ^d "Tot samyy "NK"". engine.aviaport.ru (in Russian). Nikolay Aleksandrov. Retrieved 4 October 2021.