First Delivery of Pratt & Whitney Modified A320neo Engines has arrived at Airbus group; whereby it will be installed on the Airbus A320neo. The new engines’ hardware has been modified to speed up the start time of the PW1100. Clients awaiting the new engine include Lufthansa and IndiGo; who plan to equip it in their PW1100G-powered aircraft. However, with the arrival of the new engine, not everyone is on board. Operators such as Qatar Airways has expressed that they have no interest in the new A320neo Engines; until the new aircraft start-time requirements are similar to those of A320s powered with in-service CFM International CFM56 or International Aero Engines V2500 engines.
Pratt is responding to this situation with a combination of software and hardware changes that are related to thermal bowing and the rotor bow. When an engine shuts down, it could result in unequal temperatures across the shaft section supporting the rotor. This would cause thermal deformation to the shaft material which would lead to the rotor axis to bend. At times, this could cause the compressor tips to potentially make contact with seals, linings and walls. Pratt & Whitney have solved this issue by prolonging the start-up time of the engine temporarily. A slower start-up time allow for a more even heating of the engine; thus eliminating uneven thermal deformation. In order to temporarily prolong the start-uptime of the engine, an engine-control software is put into place which would use sensors inside the engine to interrupt the start sequence at a low-pressure spool speed. Once the engine is at low-pressure spool speed, a signal is given to the engine software that indicates that the process has minimized the temperature differences to acceptable levels and normal start-up resumes.
The new revisions to the A320neo engines will have a maximum cooling time down of 90 seconds and will be delivered in June. Other changes introduced will include:
an improved carbon air-seal assembly around the third bearing,
dampers to help offset the rotor bow, on both the third and fourth bearings
a revised Woodward-produced fuel nozzle design
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