Rolls-Royce BR700

BR700 series
Rear view of a BR710
Type Turbofan
Manufacturer BMW Rolls-Royce
Rolls-Royce Deutschland
First run 1995[1]
Major applications Bombardier Global Express
Boeing 717
Gulfstream V

The Rolls-Royce BR700 family of engines powering regional jets and corporate jets. It was developed by BMW and Rolls-Royce plc through the joint venture BMW Rolls-Royce AeroEngines GmbH, established in 1990. The BR710 first ran in 1995.[1] It is manufactured in Dahlewitz, Germany. Rolls-Royce took full control of the company in 2000, which is now known as Rolls-Royce Deutschland.

Design and development

BR710

A G550 in front of a Global Express : the BR710 main applications

The BR710 is a twin shaft turbofan, 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-inch-diameter single-stage fan, driven by a two-stage LP turbine, supercharging a ten-stage HP compressor (scaled from the V2500 unit) and driven by a two-stage, air-cooled, HP turbine.

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 Midwest Airlines Boeing 717

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-inch-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.

BR725

The BR725 powers the Gulfstream G650

The BR725 is a variant of the BR710 with a three-stage-axial flow low pressure turbine to power the Gulfstream G650.[2] Its prototype underwent component bench and its first full engine run in spring 2008.[3] European certification was achieved in June 2009.[4] The first Gulfstream G650, with BR725 engines, was delivered in December 2011.[5]

The engine has a maximum thrust of 75.2 kN (16,900 lbf).[6] The 50-inch fan with swept blades is two inches larger than the BR710, the HP axial compressor benefits from three-dimensional aerodynamics for greater efficiency and have 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 have blade active tip-clearance control for more efficiency and 3D aerodynamics reduce the cooling air flow while the LP turbine have three stages instead of two. Its cruise thrust specific fuel consumption at Mach 0.85 and FL450 is 0.657 lb/lbf/h (18.6 g/kN/s).[7] With 24 titanium blades, the BR725 has a bypass ratio of 4.2:1 and is 4 dB quieter than the predecessor BR710.

Developments

Advance 2 development effort inserts new, advanced technology into existing 15,000-lb class BR710 and larger BR725 and a larger member will be added with a 52-inch fan. BR710 and BR715 main developments, the next generation of 10,0000 to 20,000 lbf engines to be introduced in the 2020s will have an Advance 3 core, improved engine health management, newer materials and cooling, a titanium “blisked” fan and an overall pressure ratio of 50:1 for a 10% thrust specific fuel consumption reduction, 50% NOx margin improvement, 99.995% reliability and a 20% better thrust-to-weight ratio.[8]

Variants

BR700-710A1-10
Variant with a 65.6kN takeoff rating and a maximum diameter of 1820mm.[9]
BR700-710A2-20
Variant with a 65.6 kN (14,700 lbf) takeoff rating and a maximum diameter of 1820mm.[9]
BR700-710B3-40
Variant with a 69 kN (16,000 lbf) takeoff rating for the BAE Systems Nimrod MRA4.[10]
BR700-710C4-11
Variant with a 68.4kN takeoff rating and a maximum diameter of 1785mm.[9]
BR700-715A1-30
Variant with an 83.23kN (18,500 lbf) takeoff rating for Boeing 717-200 basic gross weight variants.[11]
BR700-715B1-30
Variant with an 89.68kN (20,000 lbf) takeoff rating.[11]
BR700-715C1-30
Variant with a 95.33kN (21,000) takeoff rating for Boeing 717-200 high gross weight variants.[11]
BR700-725A1-12
Variant with a 71.6 kN (16,100 lbf) takeoff rating.[9]

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

Model BR700-710[6] BR700-715[13] BR700-725[6]
Configuration 1 fan, 10 HPC, 2 HPT, 2 LPT 1 fan, 2 LPC, 10 HPC, 2 HPT, 3 LPT 1 fan, 10 HPC, 2 HPT, 3 LPT
Thrust 68.4 kN (15,400 lbf) 95.33 kN (21,430 lbf) 75.2 kN (16,900 lbf)
Dry Weight 1,818.4 kg (4,009 lb) 2,085 kg (4,597 lb) 1,635.2 kg (3,605 lb)
Length 4,669 mm (183.8 in) 3,738 mm (147.2 in) 3,297 mm (129.8 in)
rotor RPM LP : 6096, HP : 16661
Fan Diameter 48 in (122 cm)[7] 58 in (147 cm) 50 in (127 cm)[7]

See also

Comparable engines
Related lists

References

  1. 1 2 3 "Rolls-Royce achieves 10 million flying hours on its BR710 engine" (Press release). Rolls-Royce. 22 May 2017.
  2. ↑ "Gulfstream G650 - Rolls-Royce power". FlightGlobal. 13 March 2008.
  3. ↑ "Rolls-Royce completes successful first run of BR725 engine". FlightGlobal. 30 Apr 2008.
  4. ↑ "Rolls-Royce wins certification for BR725 engine". FlightGlobal. 25 Jun 2009.
  5. ↑ "Gulfstream completes first G650 delivery, gains production authority". FlightGlobal. 28 Dec 2012.
  6. 1 2 3 "Type Certificate Data Sheet E.018" (PDF). EASA. 29 March 2017.
  7. 1 2 3 Thierry Dubois (April 28, 2010). "Engine makers consider clean-sheet designs". Aviation International News.
  8. ↑ "Rolls-Royce Bullish On Prospects For Bizjet Sector". Aviation International News. April 11, 2017.
  9. 1 2 3 4 "Type Certificate Data Sheet E.018 - BR700-710 series engines" (PDF). European Aviation Safety Agency. 23 June 2009. Retrieved 3 January 2010.
  10. ↑ "BR710". Rolls-Royce Germany. Retrieved 3 January 2010.
  11. 1 2 3 "Type Certificate Data Sheet E.023 - BR700-715 series engines" (PDF). European Aviation Safety Agency. 27 July 2009. Retrieved 3 January 2010.
  12. ↑ http://www.flightglobal.com/blogs/flightblogger/2010/03/fokker-to-re-join-the-battle-f.html
  13. ↑ "Type Certificate Data Sheet E.023" (PDF). EASA. 27 July 2009.
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