LEAP-1C and the COMAC C919
With its initial program win, announced in 2010, Nexcelle is positioned as a key partner on the world’s first truly integrated propulsion system – supplying a highly capable nacelle, thrust reverser and exhaust system for the CFM International LEAP-1C engine on China’s COMAC C919 jetliner.
Key features of Nexcelle’s nacelle system for the LEAP-1C include an all-new translating O-Duct thrust reverser configuration; a fan cowl that is structurally integrated to the engine; and an integrated mounting system for reduced engine distortion and enhanced on-wing performance.
A major innovation in Nexcelle’s nacelle design is its one-piece composite O-Duct thrust reverser configuration, which replaces the two-piece “D” doors on traditional thrust reversers. When deployed, the O-Duct design eliminates drag links in the engine’s secondary flow-path, enhancing the airflow path and improving fuel consumption – while also increasing thrust reverser efficiency. The O-Duct deployment is performed with an evolved electrical thrust reverser actuation system (ETRAS), replacing heavier hydraulics typically used in thrust reversers and improving maintainability.
Another of the nacelle system’s technological advances is its low drag front end that incorporates an air inlet with a one-piece lip skin – the largest of its kind to enter production on a large commercial jet engine, improving airflow and contributing to lower noise. Additionally, the inlet has a directed flow nozzle deicing system, which more efficiently swirls engine bleed air within the inlet lip, thereby providing weight, efficiency and maintainability improvements from traditional nacelle deicing systems.
Nexcelle’s LEAP-1C nacelle also incorporates the extensive use of lightweight and state-of-the-art noise-attenuating composite materials, benefitting from the joint venture parent companies’ proven experience in their respective nacelle and thrust reverser product lines.
In developing the nacelle system, Nexcelle worked closely with CFM International; the result of their collaboration is one of the first truly integrated propulsion systems for the air transport sector.
The C919 made its maiden flight in May 2017, deploying the O-Duct thrust reverser during the jetliner’s first landing, demonstrating its performance from the startup of flight testing.
Passport and the Bombardier Global 7000/8000
Nexcelle subsequently was selected to provide the nacelle and thrust reverser for GE’s new integrated powerplant, named Passport, which powers the new Bombardier Global 7000 and Global 8000 business jet aircraft.
Features of the nacelle include a one-piece extended aluminum inlet lip-outer barrel for reduced aerodynamic drag; an innovative anti-ice system that uses a directed flow nozzle concept; and a 360-degree, single-piece extended composite inner barrel incorporating advanced acoustic protection for lower engine noise levels.
It also incorporates a simplified composite fan cowl that allows for improved maintenance and reduces system weight; along with a target style thrust reverser with a fixed nozzle to provide lower weight and reverse thrust efficiency, as well as movable kicker plates that enhance thrust reverser performance in direct mode.
Bombardier’s initial Global 7000 Flight Test Vehicle (FTV1) performed its maiden flight in November 2016, utilizing the Nexcelle nacelle system’s thrust reversers for deceleration from the first landing rollout.