Progress D-18T

The Progress D-18T (or Lotarev D-18T) is a triple-drive shaft, 51,500 lbf (229 kN) high-bypass turbofan, powering the Antonov An-124 Ruslan and An-225 large freighters.

D-18T
D-18T engine installed on an Antonov An-124 "Ruslan" prototype
Type Turbofan
National origin Soviet Union/Ukraine
Manufacturer Motor Sich
Designed by Ivchenko-Progress
First run 1980
Major applications Antonov An-124 Ruslan
Antonov An-225 Mriya
Number built 188[1]

Design and development

The engine was developed in the second half of the 1970s by the then Soviet Ivchenko-Progress design bureau.[2] It is manufactured by the Motor Sich factory in Zaporizhia, Ukraine. It was the first engine in the USSR that could deliver more than 20,000 kgf (~196 kN or ~44,000 lbf) of thrust. The first start of a full-scale engine occurred on September 19, 1980, the An-124 maiden flight on December 24, 1982 and the engine passed official bench tests on December 19, 1985.

An upgraded 3M version was developed to reduce emissions and increase the life of the hot section to 14,000 h, and is introduced on An-124s of Antonov Airlines.[2] Currently 188 D-18T engines are in operation with a total flight time of over 1 million hours.

Applications
Three D-18T engines on Antonov An-225 Mriya
  • Antonov An-124
  • Antonov An-225

Specifications (D-18T)
One of the four D-18T of an Antonov An-124

Data from forecastinternational.com[3]

General characteristics

  • Type: Three-spool high bypass turbofan engine with a single-stage fan
  • Length: 5.4 m (212.6 in)
  • Width: 2.93 m (115.6 in)
  • Height: 2.79 m (109.9 in)
  • Fan diameter: 2.33 m (91.73 in)
  • Diameter:
  • Dry weight: 4,100 kg (9,039 lb)

Components

  • Compressor: Seven-stage IP compressor, seven-stage HP axial compressor
  • Combustors: Annular combustion system
  • Turbine: Single-stage HP turbine, single-stage IP turbine, four‑stage LP turbine

Performance

  • Maximum thrust: Takeoff: 23,430 kgf (51,700 lbf; 229.8 kN); Cruise: 4,860 kgf (10,700 lbf; 47.7 kN)[4]
  • Overall pressure ratio: 27.5
  • Bypass ratio: 5.7
  • Turbine inlet temperature: 1,600 K (1,327 °C; 2,420 °F)
  • Specific fuel consumption: Takeoff: 9.8 g/(kN⋅s) (0.345 lb/(lbf⋅h)); Cruise: 15.5 g/(kN⋅s) (0.546 lb/(lbf⋅h))[4]
  • Thrust-to-weight ratio: 5.72

See also

Comparable engines

Related lists

References
  1. D18T at deagel.com
  2. Guy Norris (Oct 10, 2018). "Freighter Growth And Possible An-124 Reengining Boost CF6 Prospects". Aviation Week & Space Technology.
  3. D-18 by Lotarev
  4. "D-18T turbofan". Performance. SE Ivchenko Progress. Retrieved December 9, 2019.
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