Kuznetsov NK-25

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

NK-25
Type	Turbofan
National origin	Soviet Union
Manufacturer	Kuznetsov Design Bureau
Major applications	Tupolev Tu-22M

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)

See also

Comparable engines

• Kuznetsov NK-22
• Kuznetsov NK-32

Related lists

• List of aircraft engines