More than 100 hours of testing on a full-scale PW1000G PurePower engine core has so far validated Pratt & Whitney's performance goals for its new generation of commercial jet engines, the company announced today. The core has also demonstrated “excellent” starting and operability characteristics, according to Pratt & Whitney. The results have left the company confident that the first PW1000G for the Bombardier C Series will meet its target to test “later this summer,” it added.
“We are extremely pleased with the core test results indicating that the overall engine performance is well aligned with expectations,” said Paul Adams, Pratt & Whitney senior vice president of engineering. “These results position us to execute the development of our Next Generation product family flawlessly.”
The engine core consists of an “ultra-efficient” high-pressure compressor, a low-emissions combustor and an all-new high-pressure turbine, and the testing program evaluates engine performance, operability and structural design characteristics of those key modules.
Formerly known as the Geared Turbofan, the engine uses a gear system that, in simple terms, allows the engine's fan to turn at roughly one-third the speed of the low-pressure compressor and turbine. Because the low-pressure components turn much faster than those in a conventional engine, they can take in more air, allowing designers to remove stages and make the entire low-pressure side lighter and more efficient.
Removing stages also allows P&W to make the engine shorter, therefore moving its center of gravity forward and allowing airframe designers to position it closer to the wing. That relieves stress from the wing, in turn allowing for the use of a lighter airfoil.
Along with core testing, Pratt & Whitney has performed module-level testing of the fan drive gear system with simulations of more than 40,000 takeoffs and landings; “hundreds of hours” of testing on the high-pressure compressor; nearly 200 hours of testing on the low-pressure compressor, verifying low-spool high-speed performance; and extensive fan module testing with 300 pieces of instrumentation that verified the performance, operability and acoustics of the low-speed fan.
Apart from winning a place on the C Series, scheduled to enter service in 2013, the PW1000G won the competition to power the Mitsubishi Regional Jet, scheduled to enter service in 2014. Russia's Irkut has also chosen the PW1000G to power the proposed new single-aisle MC-21, scheduled for service entry in 2016.