The Kuznetsov NK-12 is a Sovietturboprop engine of the 1950s, designed by the Kuznetsov design bureau. The NK-12 drives two large four-bladed contra-rotating propellers, 5.6 m (18 ft) diameter (NK-12MA), and 6.2 m (20 ft) diameter (NK-12MV). It is the most powerful turboprop engine to enter service.
NK-12
NK-12M Turboprop engine on a Tu-95 at RIAT Fairford 1993
The design that eventually became the NK-12 turboprop was developed after World War II by a team of Soviet scientists and deported German engineers under Ferdinand Brandner, who had worked for Junkers previously; the design bureau was headed by chief engineer Nikolai D. Kuznetsov. Thus, the NK-12 design evolved from late-war German turboprop studies. This started with the postwar development of the wartime Jumo 022 turboprop design that was designed to develop 6,000 shp (4,500 kW), weighing 3,000 kg (6,600 lb). The effort continued with a 5,000 shp (3,700 kW), weighing 1,700 kg (3,700 lb), completed by 1947. Evolution to the TV-12 12,000 shp (8,900 kW) engine required extensive use of new Soviet-developed alloys and was completed in 1951.
The NK-12 is the most powerful turboprop engine to enter service, ahead of the Europrop TP400 (in 2005). Another engine of similar size, the Pratt & Whitney T57 with 15,000 shp (11,000 kW) and 5,000 lbf (22 kN) jet thrust, ran 3,100 hours before being cancelled in 1957.[1][2] The NK-12 powers the Tupolev Tu-95bomber and its derivatives such as the Tu-142maritime patrol aircraft and the Tupolev Tu-114airliner (with NK-12MV), which still holds the title of the world's fastest propeller-driven aircraft despite being retired from service in 1991. It also powered the Antonov An-22 Antei (with NK-12MA), the world's largest aircraft at the time, and several types of amphibious assault craft, such as the A-90 Orlyonok "Ekranoplan".
The engine has a 14-stage axial-flow compressor, producing pressure ratios between 9:1 and 13:1 depending on altitude, with variable inlet guide vanes and blow-off valves for engine operability. The combustion system used is a cannular-type: each flame tube is centrally mounted on a downstream injector that ends in an annular secondary region. The contra-rotating propellers and compressor are driven by the five-stage axial turbine. Mass flow is 65 kg (143 lb) per second.[3]
Upgraded version of the NK-12MP that develops more power, produces half the vibration and is paired with the Aerosila AV-60T propeller; replaces the NK-12MP engine and AV-60K propeller on the Tupolev Tu-95MS[6]
Applicationsedit
A pair of Kuznetsov NK-12MAs installed on an Antonov An-22
^Connors, J. (2010). The engines of Pratt & Whitney : a technical history. American Institute of Aeronautics and Astronautics. p. 294. ISBN978-1-60086-711-8.
^Mulready, Dick (2001). Advanced engine development at Pratt & Whitney : the inside story of eight special projects, 1946-1971. Society of Automotive Engineers. p. 20. ISBN9780768006643.
^"Creation of the TV-2 (NK-12) turboprop engine". www.airpages.ru. Retrieved 22 March 2019.
^NK-12MV(PDF). Domestic Aerospace Engineering (in Russian). p. 18. Retrieved August 21, 2019. {{cite encyclopedia}}: |website= ignored (help)
^NK-12MP, NK-12MK(PDF). Domestic Aerospace Engineering (in Russian). p. 19. Retrieved August 21, 2019. {{cite encyclopedia}}: |website= ignored (help)
^Karnozov, Vladimir (31 October 2018). "More power for the mighty 'Bear'". Defense. AINonline.
^Wilkinson, Paul H. (1970). Aircraft engines of the World 1970 (22nd ed.). London: Paul H. Wilkinson. p. 221.
^. Archived from the original on 2017-07-29. Retrieved 2011-04-22.
External linksedit
Wikimedia Commons has media related to Kuznetsov NK-12.
airventure.de - Image, finnish museum
"Propfans: Thrust class > 10000 kgf: Technical characteristics". Aerosila. from the original on October 15, 2017.
December 15, 2023
kuznetsov, soviet, turboprop, engine, 1950s, designed, kuznetsov, design, bureau, drives, large, four, bladed, contra, rotating, propellers, diameter, 12ma, diameter, 12mv, most, powerful, turboprop, engine, enter, service, 12nk, turboprop, engine, riat, fairf. The Kuznetsov NK 12 is a Soviet turboprop engine of the 1950s designed by the Kuznetsov design bureau The NK 12 drives two large four bladed contra rotating propellers 5 6 m 18 ft diameter NK 12MA and 6 2 m 20 ft diameter NK 12MV It is the most powerful turboprop engine to enter service NK 12NK 12M Turboprop engine on a Tu 95 at RIAT Fairford 1993Type TurbopropNational origin Soviet UnionManufacturer Kuznetsov Design BureauFirst run October 1952Major applications Antonov An 22 Tupolev Tu 95 Tupolev Tu 114 Tupolev Tu 142The exhaust ports of a NK 12 in an outboard nacelle on a Tu 95 Contents 1 Design and development 2 Variants 3 Applications 4 Specifications NK 12MV 4 1 General characteristics 4 2 Components 4 3 Performance 5 See also 6 References 7 External linksDesign and development editThe design that eventually became the NK 12 turboprop was developed after World War II by a team of Soviet scientists and deported German engineers under Ferdinand Brandner who had worked for Junkers previously the design bureau was headed by chief engineer Nikolai D Kuznetsov Thus the NK 12 design evolved from late war German turboprop studies This started with the postwar development of the wartime Jumo 022 turboprop design that was designed to develop 6 000 shp 4 500 kW weighing 3 000 kg 6 600 lb The effort continued with a 5 000 shp 3 700 kW weighing 1 700 kg 3 700 lb completed by 1947 Evolution to the TV 12 12 000 shp 8 900 kW engine required extensive use of new Soviet developed alloys and was completed in 1951 The NK 12 is the most powerful turboprop engine to enter service ahead of the Europrop TP400 in 2005 Another engine of similar size the Pratt amp Whitney T57 with 15 000 shp 11 000 kW and 5 000 lbf 22 kN jet thrust ran 3 100 hours before being cancelled in 1957 1 2 The NK 12 powers the Tupolev Tu 95 bomber and its derivatives such as the Tu 142 maritime patrol aircraft and the Tupolev Tu 114 airliner with NK 12MV which still holds the title of the world s fastest propeller driven aircraft despite being retired from service in 1991 It also powered the Antonov An 22 Antei with NK 12MA the world s largest aircraft at the time and several types of amphibious assault craft such as the A 90 Orlyonok Ekranoplan The engine has a 14 stage axial flow compressor producing pressure ratios between 9 1 and 13 1 depending on altitude with variable inlet guide vanes and blow off valves for engine operability The combustion system used is a cannular type each flame tube is centrally mounted on a downstream injector that ends in an annular secondary region The contra rotating propellers and compressor are driven by the five stage axial turbine Mass flow is 65 kg 143 lb per second 3 Variants edit nbsp NK 12MVData from Alexandrov NK 12 12 500 hp 9 300 kW initial development model used on the Tupolev Tu 95 and Tupolev Tu 116 NK 12M 12 000 hp 8 950 kW used on the Tupolev Tu 114 NK 12MV 14 795 hp 11 033 kW 4 5 6 m diameter 18 ft 4 in 560 cm 220 in AV 60 propellers used on the Tupolev Tu 95 Tupolev Tu 126 and Tupolev Tu 142 NK 12MA 15 001 hp 11 186 kW 6 2 m diameter 20 ft 4 in 620 cm 244 in AV 90 propellers used on the Antonov An 22 NK 12MK 14 795 hp 11 033 kW 5 6 m diameter 18 ft 4 in 560 cm 220 in propellers built with corrosion resistant materials used on the A 90 Orlyonok NK 12MP 14 795 hp 11 033 kW 5 modernized version used on the Tupolev Tu 95MS and Tupolev Tu 142M NK 12MPM Upgraded version of the NK 12MP that develops more power produces half the vibration and is paired with the Aerosila AV 60T propeller replaces the NK 12MP engine and AV 60K propeller on the Tupolev Tu 95MS 6 Applications edit nbsp A pair of Kuznetsov NK 12MAs installed on an Antonov An 22A 90 Orlyonok Antonov An 22 Tupolev Tu 95 Tupolev Tu 114 Tupolev Tu 116 Tupolev Tu 126 Tupolev Tu 142Specifications NK 12MV editData from Aircraft engines of the World 1970 7 Civil Turboshaft Turboprop Specifications 8 General characteristics Type Turboprop engine Length 6 m 20 ft Diameter 1 150 mm 45 in Dry weight 2 900 kg 6 400 lb Components Compressor 14 stage axial flow Combustors 12 combustion chambers Turbine 5 stage axial turbine Fuel type Aviation kerosene such as JP 4 Soviet spec T 1 or T 2 Oil system Pressure spray at 5 9 bar 85 psi Performance Maximum power output 11 000 kW 15 000 shp equivalent 11 000 kW 14 750 shp 2 78 kN 625 lbf at 9 250 rpm Overall pressure ratio 13 1 at 9 250 rpm Air mass flow 65 kg s 140 lb s at 9 250 rpm Turbine inlet temperature 1 250 K 980 C Specific fuel consumption 0 219 kg kWh 0 360 lb hp h Power to weight ratio 3 7 kW kg 2 3 hp lb See also editRelated lists List of aircraft enginesReferences edit Connors J 2010 The engines of Pratt amp Whitney a technical history American Institute of Aeronautics and Astronautics p 294 ISBN 978 1 60086 711 8 Mulready Dick 2001 Advanced engine development at Pratt amp Whitney the inside story of eight special projects 1946 1971 Society of Automotive Engineers p 20 ISBN 9780768006643 Creation of the TV 2 NK 12 turboprop engine www airpages ru Retrieved 22 March 2019 NK 12MV PDF Domestic Aerospace Engineering in Russian p 18 Retrieved August 21 2019 a href Template Cite encyclopedia html title Template Cite encyclopedia cite encyclopedia a website ignored help NK 12MP NK 12MK PDF Domestic Aerospace Engineering in Russian p 19 Retrieved August 21 2019 a href Template Cite encyclopedia html title Template Cite encyclopedia cite encyclopedia a website ignored help Karnozov Vladimir 31 October 2018 More power for the mighty Bear Defense AINonline Wilkinson Paul H 1970 Aircraft engines of the World 1970 22nd ed London Paul H Wilkinson p 221 Civil Turboshaft Turboprop Specifications Archived from the original on 2017 07 29 Retrieved 2011 04 22 External links edit nbsp Wikimedia Commons has media related to Kuznetsov NK 12 ciad ssau ru Image airventure de Image finnish museum Propfans Thrust class gt 10000 kgf Technical characteristics Aerosila Archived from the original on October 15 2017 Retrieved from https en wikipedia org w index php title Kuznetsov NK 12 amp oldid 1170751418, wikipedia, wiki, book, books, library,
