DV-2
DV-2 turbofan engine
Type	Turbofan
National origin	Soviet Union/Czechoslovakia
Manufacturer	Ivchenko-Progress/PSLM
First run	1987
Major applications	L-39MS Albatros L-59 Super Albatros Hongdu L-15 Ilyushin Il-108
Number built	124[1]
Developed from	Ivchenko AI-25

The Lotarev DV-2 (or PSLM DV-2) is a two-spool turbofan engine manufactured in Považská Bystrica, Slovakia by Považské Strojárne Letecké Motory (PSLM) (former ZVL) and designed in partnership with Ivchenko Lotarev Design Bureau.^[2]

Contents 1 Design and development 2 Applications 3 Specifications (DV-2S) 4 See also 5 References 6 External links

[edit] Design and development

Developed from the Ivchenko AI-25 turbofan engine, ZVL was also responsible for pre-production and serial engine production.^[1]

The DV-2 is a two-spool modular aviation turbofan engine with a single-stage overhung fan, two-stage LP compressor, seven-stage HP compressor, single-stage HP turbine, and two-stage LP turbine, and an annular combustion system. Maximum power at T-O is 4,850 lbf (21.58 kN) with a specific fuel consumption of 0.593lb/hr/lbf, at Maximum Rating, Sea Level Static, ISA.^[3]

One of the most unusual features of this military engine is the single stage fan; most trainer and combat engines have multi-staged fans, single stage fans normally being the preserve of civil and military transport turbofans. Ivchenko Lotarev chose a very low specific thrust (net thrust/airflow) cycle for the DV-2, so a single stage fan is sufficient to develop the desired fan pressure ratio. Even so, the pressure ratio produced is somewhat higher than that normally developed by a single stage fan. Owing to the low specific thrust, the bypass ratio for the engine is higher than normal for a military turbofan.

This engine was required to power new versions of the L-39 trainer, L-39MS and L-59. Other turbofan engine models in the DV-2 family include the DV-2A, DV‑2A.2 and DV-2S.

[edit] Applications

• L-39MS Albatros
• L-59 Super Albatros
• Hongdu L-15
• Ilyushin Il-108

[edit] Specifications (DV-2S)

Data from PSLM website^[4]

General characteristics

• Type: Two-spool low-bypass turbofan engine with a single-stage fan
• Length: 1,72 m (67.7 in)
• Width: 0.82 m (32.2 in)
• Height: 1.04 m (40.9 in)
• Fan diameter: 0.64 m (25.2 in)
• Diameter:
• Dry weight: 439 kg (967.8 lb)

Components

• Compressor: Two-stage LP, seven-stage HP
• Combustors: Annular combustion system with 16 fuel injection nozzles
• Turbine: single-stage HP, two-stage LP

Performance

• Maximum Thrust: 2,498 Kgf; 5,508 pounds-force (24.50 kN)
• Overall pressure ratio: 15.5
• Bypass ratio: 1.4

• 
  

• Turbine inlet temperature: 1,440°K
• Specific fuel consumption: 60 kg/kN/h
• Power-to-weight ratio:

[edit] See also

Related development

• Ivchenko AI-25
  

Comparable engines

• Garrett F109
• Williams FJ44
  

Related lists

• List of aircraft engines
  

[edit] References

[edit] External links

• PSLM company website

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