Tumansky R-79V-300

The Tumansky R-79V-300. is an afterburning turbofan developed by NPO Soyuz in the Soviet Union, now AMNTK Soyuz in Russia. The R-79 is a vectored-thrust afterburning turbofan used as powerplant for the supersonic Yak-141 vertical takeoff/landing (VTOL) fighter aircraft designed by Yakovlev to replace the Yak-38

Design and development The development of the R-79 began in the late 1970 under the direction of V.K. Kobchenko with development project designation Izdeliye 79 ('Product 79'). The design and development of the R-79V-300 was driven by the requirement of designing a power plant for a supersonic V/STOL aircraft working alongside two lift engines (RD-41). Unlike its predecessor, the thrust-vectored non-afterburning turbofan Tumansky R-27 used in the Yak-38, the R-79 single exhaust design combined with a three-joints ring swivel nozzle made possible an afterburner turbofan capable of operate in any nozzle position.

The R-79V-300 used in the Yak-141 is a two-shaft axial-flow afterburning turbofan with counter-rotating spools to reduce weight and gyroscopic forces on the engine. The engine has a three-stage low-pressure compressor (fan) and an eleven-stage high-pressure compressor, with bleed air from after the 6th stage for roll control. Both compressors are driven by a pair of counter-rotating 2-stage turbines. However the bleed air for roll control, up to 10 kg/s taken from the core will reduce the thrust. Paired with two RD-41 (4.1 kN, 4,260 kgf) they totals a thrust in hovering mode of at ISA conditions.Piotr Butowski, John Fricker, (1995), pp. 31-32

Ground testing, production and test flights extended from 1983 to 1991 when the Yak-141 was cancelled.Piotr Butowski, John Fricker, (1995), pp. 31, 36

Further developments During the 1990s Soyuz developed an alternative rectangular nozzle for vector control in the pitch axis, replaced the analogue electronic engine controller with a FADEC and increased thrust. Nevertheless, this improved version and a non-augmented R-79V-300 variant designated VK-21 have no reported application. In the early 2000s AMNTK Soyuz developed a 30 MW gas turbine using the core and turbines of the R-79V-300 replacing the low pressure compressor and adding a 5-stage power turbine developed by JSC Kuznetsov.

Variants

R-79V-300 With a 3-wedge ring swivel nozzle capable of 0 – 95º vector control with full afterburner. thrust R-79M (R179-300) Improved version with higher maximum thrust, FADEC and new rectangular nozzle that enable a control of ±20° in the pitch axis. thrust. R-579SPS-300 Improved engine presented at 2021 MAKS. VK-21 Proposed non-augmented version of the R-79V-300. of thrust. GTE-30-300 Aero-derivative gas turbine with a capacity of 30MW and 33 MW peak power with a thermal efficiency of 36% developed since 2002–2003 and presented at 2005 MAKS but with little information after that. Airflow: 99.3 kg/s, Overall pressure ratio: 22.1:1.

Applications

Yakovlev Yak-141

Specifications (R-79V-300) with reheat

Tumansky R-79V-300

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