Rolls-Royce BR700

Last updated
BR700 series
Rolls-Royce BR710 Tempelhof.jpg
Rear view of a BR710
Type Turbofan
Manufacturer Rolls-Royce Deutschland
First run1995 [1]
Major applications Bombardier Global Express
Boeing 717
Gulfstream V
Number built3,600+ [2]

The Rolls-Royce BR700 is a family of turbofan engines for regional jets and corporate jets. It is manufactured in Dahlewitz, Germany, by Rolls-Royce Deutschland: this was initially a joint venture of BMW and Rolls-Royce plc established in 1990 to develop this engine. The BR710 first ran in 1995. [1] The United States military designation for the BR725 variant is F130. [3]

Contents

Design and development

BR710

A G550 in front of a Bombardier Global Express: the BR710 main applications Untitled Gulfstream Aerospace G-V-SP Gulfstream G550; M-ATPS@ZRH;07.05.2012 (7153753143).jpg
A G550 in front of a Bombardier Global Express: the BR710 main applications

The BR710 is a twin shaft turbofan, and entered service on the Gulfstream V in 1997 and the Bombardier Global Express in 1998. This version has also been selected to power the Gulfstream G550.

The BR710 comprises a 48 in (120 cm) diameter single-stage fan, driven by a two-stage LP turbine, and a ten-stage HP compressor (scaled from the V2500 unit) driven by a two-stage, air-cooled, HP turbine.

This engine has a thrust-specific fuel consumption (TSFC) of 0.39 lb/(lbf⋅h) (11 g/(kN⋅s)) at static sea level takeoff and 0.64 lb/(lbf⋅h) (18 g/(kN⋅s)) at a cruise speed of Mach 0.8 and altitude of 35,000 ft (10,668 m). [4]

In May 2017, the 3,200 engines in service reached 10 million flying hours. [1]

Another rerated version, with a revised exhaust system, was selected for the now-cancelled Royal Air Force Nimrod MRA4s.

BR715

A BR715 engine on a Boeing 717 of Volotea EC-MGT 717 Volotea tailfin VGO.jpg
A BR715 engine on a Boeing 717 of Volotea

The BR715 is another twin-shaft turbofan; this engine was first run in April 1997 and entered service in mid-1999. This version powers the Boeing 717.

A new LP spool, comprising a 58 in (150 cm) diameter single-stage fan, with two-stage LP compressor driven by a three-stage LP turbine, is incorporated into the BR715. The HP spool is similar to that of the BR710.

The IP compressor booster stages supercharge the core, increasing core power and thereby net thrust. However, a larger fan is required, to keep the specific thrust low enough to satisfy jet noise considerations.

This engine has a TSFC of 0.37 lb/(lbf⋅h) (10 g/(kN⋅s)) at static sea level takeoff and 0.62 lb/(lbf⋅h) (18 g/(kN⋅s)) at a cruise speed of Mach 0.8 and altitude of 35,000 ft (10,668 m). [4] :  96  

BR725

The BR725 powers the Gulfstream G650 N711SW (3321393781).jpg
The BR725 powers the Gulfstream G650

The BR725 is a variant of the BR710 to power the Gulfstream G650. [5] Its prototype underwent component bench and its first full engine run in spring 2008. [6] European certification was achieved in June 2009. [7] The first Gulfstream G650, with BR725 engines, was delivered in December 2011. [8]

The engine has a maximum thrust of 16,900 lbf (75.2 kN). [9] The 50 in (130 cm) fan with 24 swept blades is 2 in (5.1 cm) larger than the BR710. The HP axial compressor benefits from three-dimensional aerodynamics for greater efficiency and has 10 stages including five blisks to reduce weight. The BR715 inspired combustor yields a longer life and lower emissions: 80% lower smoke and unburned hydrocarbons and 35% lower NOx than CAEP 6 limits. The two-stage HP turbine has blade active tip-clearance control for more efficiency; 3D aerodynamics reduce the cooling air flow. The LP turbine has three stages instead of two. The BR725 has a bypass ratio of 4.2:1 and is 4 dB quieter than the predecessor BR710. Its cruise thrust specific fuel consumption at Mach 0.85 and FL450 is 0.657 lb/(lbf⋅h) (18.6 g/(kN⋅s)). [10]

F130

On 24 September 2021, the United States Air Force (USAF) selected the F130 (the US military designation for the BR725) for the B-52H Stratofortress Commercial Engine Replacement Program (CERP). [11] This version has 17,000 lbf (75.6 kN) thrust, similar to the existing engines (Pratt & Whitney TF33). The USAF will purchase 650 engines (608 direct replacements, 42 spares) for its fleet of 76 B-52H aircraft in a $2.6 billion deal; [12] upgraded aircraft will be redesignated B-52J. [13]

The CERP engines will be built at Rolls-Royce North America's plant in Indianapolis, Indiana, [14]

Future developments

The Advance 2 development effort inserts new, advanced technology into existing 15,000 lbf (67 kN) class BR710 and the larger BR725 engines. An even larger engine will also be made, with a 52 in (130 cm) fan. The BR710 and BR715 main developments, the next generation of 44–89 kN (10,000–20,000 lbf) engines to be introduced in the 2020s, will have an Advance 3 core, improved engine health management, newer materials, and cooling. They will also have a “blisk” fan made out of titanium, with an overall pressure ratio of 50:1. These improvements will yield a 10% thrust specific fuel consumption reduction, 50% NOx margin improvement, 99.995% reliability, and a 20% better thrust-to-weight ratio. [15]

Pearl 15

Pearl 15 Rolls-Royce Pearl.jpg
Pearl 15

The Pearl engine was developed in Dahlewitz from the BR700 with Advance2 technologies. [16] EASA certification was applied for on 28 February 2015. [9] It made its first ground run in 2015, type tests in 2016, and flight tests in 2017. [17] Six test engines logged over 6,000 cycles on 2,000 test hours. [18] The test program included lightning strike, water ingestion, ice, and -40 °C cold-start testing. [19]

EASA certification was granted on 28 February 2018 and it was unveiled on 28 May 2018. It was undergoing flight tests in May 2018 for an end of 2019 planned entry into service aboard the Bombardier Global Express 5500 and 6500 developments. [16] It should have logged 10,000 hours by then. [19]

Its layout is similar to the BR725, with the same stage count and 24 titanium fan blades. [18] Its fan has a 48.5 in (123 cm) diameter. [20] The enhanced 3-stage LP turbine with advanced high temperature materials, advanced segments and seals allow for higher pressures and temperatures and the new low emissions cooled combustor includes a new tiled combustion chamber. [17] Its core uses advanced nickel alloys and ceramic coatings, includes a new 10-stage HP compressor with 6 titanium blisks and a new 2-stage HP turbine with enhanced aerodynamics and blade cooling, enhanced segments and seals. [17]

Its overall pressure ratio attains 43:1 and its bypass ratio 4.8:1. [17] The HP compressor ratio rises to 24:1. [18] It delivers up to 9% more thrust with 15,125 lbf (67.28 kN) and a 7% TSFC improvement while being 2 decibels quieter. [16] Health monitoring should improve on the BR710 99.97% dispatch reliability which is logging one unplanned engine removal per 100,000 hours while the BR715 is approaching zero unplanned removals. [20]

Pearl 700

The Pearl 700 will power the Gulfstream G700, a stretch of the previous G650, and the G800, with more range than the G650ER. Evolved from the BR725 with a similar architecture plus a fourth low-pressure turbine stage and a 2 in (5.1 cm) larger, 51.8 in (132 cm) blisk fan, its bypass ratio is higher than 6.5:1 and its overall pressure ratio should exceed 50:1. It should provide 18,250 lbf (81.2 kN) of thrust, 3-5% better thrust specific fuel consumption than the BR725 variant powering the Gulfstream G650, reduced emissions and lower noise. [21]

Pearl 10X

The upcoming Dassault Falcon 10X will be powered by two Pearl 10X engines over 18,000 lbf (80 kN) thrust, with a titanium fan blisk, a 10-stage HP compressor, a two-stage shroudless HP turbine and a four-stage LP turbine. [22] The initial Pearl 10X test engine was first run in early 2022 and the programme had accumulated 1,000h of testing by May, along with the Advance2 demonstrator. [23] The Advance2 core and new low-pressure system allows 5% more efficiency than the previous Rolls-Royce business jet engines. [23]

Variants

BR700-710A1-10
Variant with a 14,700 lbf (65.6 kN) takeoff rating and a maximum diameter of 72 in (1,820 mm) for the Gulfstream GV. [24]
BR700-710A2-20
Variant with a 14,700 lbf (65.6 kN) takeoff rating and a maximum diameter of 72 in (1,820 mm) for the Bombardier Global Express/XRS/5000/6000. [24]
BR700-710B3-40
Variant with a 16,000 lbf (69 kN) takeoff rating for the BAE Systems Nimrod MRA4. [25]
BR700-710C4-11
Variant with a 15,400 lbf (68.4 kN) takeoff rating and a maximum diameter of 70.3 in (1,785 mm) for the Gulfstream GV-SP (G500/G550). [24]
BR700-710D5-21
Variant with a 15,200 lbf (67.8 kN) takeoff rating and a maximum radius of 39 in (980 mm) for the Bombardier Global 5500/6500. [24]
BR700-715A1-30
Variant with a 18,710 lbf (83.23 kN) takeoff rating for Boeing 717-200 basic gross weight variants. [26]
BR700-715B1-30
Variant with an 20,160 lbf (89.68 kN) takeoff rating. [26]
BR700-715C1-30
Variant with a 21,430 lbf (95.33 kN) takeoff rating for Boeing 717-200 high gross weight variants. [26]
BR700-725A1-12
Variant with a 16,900 lbf (75.2 kN) takeoff rating and a fan diameter of 50 in (1,270 mm) for the Gulfstream GVI (G650). [24]
F130
Military variant of the BR700-725 with a 17,000 lbf (75.62 kN) maximum rating for the Boeing B-52 Stratofortress. [27]
BR700-TP
Turboprop variant rated at 7,460 kilowatts (10,000 shaft horsepower) and proposed for the European Future Large Aircraft (which became the Airbus A400M Atlas military transporter/tanker). [28]

The BR715 thrust ratings can be adjusted by changing a plug in the FADEC controller, meaning no engine change is required. The A1-30 can become a C1-30 with a simple plug and software change.

Applications

Specifications

EASA Type Certificate Data Sheet [9]
ModelBR700-710A1/A2/C4BR700-715 [30] BR700-725A1BR700-710D5-21
(Pearl 15)		BR700-730B2-14 [31]
(Pearl 700) [21] 		Pearl 10X [22]
Compressor1 fan, 10 HPC1 fan, 2 LPC, 10 HPC1 fan, 10 HPC
Turbine2 HPT, 2 LPT2 HPT, 3 LPT2 HPT, 4 LPT
Thrust 15,400 lbf (68.4 kN)21,430 lbf (95.33 kN)16,900 lbf (75.2 kN)15,200 lbf (67.8 kN)18,250 lbf (81.2 kN)18,250 lbf (81.2 kN) [32]
Dry Weight4,009 lb (1,818.4 kg)4,597 lb (2,085 kg)3,605 lb (1,635.2 kg)4,032 lb (1,828.8 kg)3,565 lb (1,617.1 kg)
Thrust / Weight 3.844.664.693.775.12
Length183.8 in (4,669 mm)147.2 in (3,738 mm)129.8 in (3,297 mm)189.3 in (4,809 mm)128.7 in (3,268 mm)
Rotor RPM LP: 6,096, HP: 16,661LP: 6,096, HP: 16,661LP: 6,096, HP: 16,661LP: 7,431, HP: 19,000LP: 6,500, HP: 19,000
Fan Diameter48 in (122 cm) [10] 58 in (147 cm) [33] 50 in (127 cm) [10] 48.5 in (123 cm) [20] 51.8 in (132 cm)
Bypass ratio [34] 3.84:14.55–4.68:1 [35] 4.1:14.8:1 [17] >6.5:1
Overall pressure ratio 43:1 [17] >50:1

See also

Comparable engines

Related lists

Related Research Articles

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References

  1. 1 2 3 "Rolls-Royce achieves 10 million flying hours on its BR710 engine" (Press release). Rolls-Royce. 22 May 2017. Archived from the original on 19 July 2020. Retrieved 26 May 2017.
  2. ↑ "BR710". Rolls-Royce. Retrieved 21 September 2020.
  3. ↑ Rolls Royce offers BR725 for B-52 re-engine effort
  4. 1 2 Élodie Roux (2007). Turbofan and turbojet engines: Database handbook. Elodie Roux. p. 94. ISBN   9782952938013. OCLC   879328119.
  5. ↑ "Gulfstream G650 - Rolls-Royce power". FlightGlobal. 13 March 2008.
  6. ↑ "Rolls-Royce completes successful first run of BR725 engine". FlightGlobal. 30 Apr 2008.
  7. ↑ "Rolls-Royce wins certification for BR725 engine". FlightGlobal. 25 Jun 2009.
  8. ↑ "Gulfstream completes first G650 delivery, gains production authority". FlightGlobal. 28 Dec 2012.
  9. 1 2 3 "Type Certificate Data Sheet E.018". EASA. 28 February 2018.
  10. 1 2 3 Thierry Dubois (April 28, 2010). "Engine makers consider clean-sheet designs". Aviation International News.
  11. ↑ "Rolls Royce offers BR725 for B-52 re-engine effort". FlightGlobal. 14 September 2017. Retrieved 17 September 2017.
  12. ↑ "DAF awards Rolls-Royce B-52H engine contract". Department of the Air Force. 24 Sep 2021.
  13. ↑ Tirpak, John A. (5 April 2023). "It's Official: The Re-Engined B-52 Will be the B-52J". Air & Space Forces Magazine. Retrieved 10 April 2023.
  14. ↑ Tirpak, John (September 24, 2021). "Rolls-Royce Wins B-52 Re-Engining Program Worth $2.6 Billion". Air Force Magazine. Air Force Association. Retrieved September 25, 2021.
  15. ↑ "Rolls-Royce Bullish On Prospects For Bizjet Sector". Aviation International News. April 11, 2017.
  16. 1 2 3 "Rolls-Royce celebrates launch of new Pearl engine family" (Press release). Rolls-Royce. 28 May 2018.
  17. 1 2 3 4 5 6 "Pearl 15". Rolls-Royce.
  18. 1 2 3 Stephen Trimble (28 May 2018). "Rolls-Royce reveals surprise Pearl engine family for business jets". Flightglobal.
  19. 1 2 Kerry Lynch (May 28, 2018). "Rolls-Royce Pearl 15 Marks Launch of New Engine Family". AIN online.
  20. 1 2 3 John Morris (May 28, 2018). "Rolls-Royce Barrels Back Into Bizjets With Pearl Engine". Aviation Week Network.
  21. 1 2 Fred George (Oct 21, 2019). "Gulfstream Unveils New G700 Flagship At NBAA-BACE". Aviation Week Network.
  22. 1 2 Dominic Perry (6 May 2021). "Dassault takes fight to ultra-long-range rivals with Falcon 10X launch". Flightglobal.
  23. 1 2 Dominic Perry (22 May 2022). "Pearl 10X engine testing spools up". Flightglobal.
  24. 1 2 3 4 5 "EASA.E.018". EASA. European Aviation Safety Agency. 23 June 2009. Archived from the original on 2020-09-19. Retrieved 2020-08-05.
  25. ↑ "BR710". Rolls-Royce Germany. Archived from the original on 12 May 2009. Retrieved 3 January 2010.
  26. 1 2 3 "Type Certificate Data Sheet E.023 - BR700-715 series engines" (PDF). European Aviation Safety Agency. 27 July 2009. Archived from the original (PDF) on 23 December 2009. Retrieved 3 January 2010.
  27. ↑ "Rolls-Royce F130 engine for B-52 completes early testing in Indianapolis". rolls-royce.com. Rolls-Royce. 16 September 2019. Retrieved 6 March 2023.
  28. ↑ "BMW Rolls-Royce presents prop BR700". Flight International . 4 March 1997.
  29. ↑ "Fokker to re-join the battle for the 100-seat market with XF100 NG - FlightBlogger - Aviation News, Commentary and Analysis". www.flightglobal.com. Archived from the original on 2010-03-11.
  30. ↑ "Type Certificate Data Sheet E.023" (PDF). EASA. 27 July 2009.
  31. ↑ "Type Certificate Data Sheet E.135". EASA. 12 October 2023.
  32. ↑ Guy Norris (May 22, 2023). "Rolls-Royce's Pearl 10X Set For 747 Flying Testbed Evaluation". Aviation Week.
  33. ↑ "BR715". Rolls-Royce.
  34. ↑ John Croft (29 Sep 2008). "G650: As good as it gets?". Flightglobal.
  35. ↑ "BR715: Power for the Boeing 717-200" (PDF). Rolls-Royce. May 2005. Archived from the original (PDF) on 19 October 2006. Retrieved 3 October 2020.
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