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geared turbofan
- Definição1
- A type of turbofan aircraft engine with a planetary gearbox between the low pressure compressor / turbine and the fan, enabling each to spin at its optimum speed.
- Fonte1
- Wikipédia, a Enciclopédia Livre, Geared turbofan. Disponível em:
- Fonte2
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Report by the second CAEP noise technology independent expert panel: novel aircraft-noise technology review and medium- and long-term noise reduction goals: report. Montreal, 2014. (Doc. 10017).
- Nota Adicional1
- The geared turbofan (GTF) technology allows the fan to be operated at lower speed and the low-pressure turbine and low-pressure compressor at higher speeds. This reduces the number of stages required in the compressor and turbine, reducing engine weight and part count and maintenance costs. However, the weight benefit is partly offset by the weight of the required gearbox. The lower fan speed and lower pressure ratio improves fan efficiency and has a noise benefit. The higher turbine and compressor speeds increase the frequencies of compressor and turbine tones, which are strongly attenuated in the atmosphere. The GTF enables a minimum fuel-burn at higher bypass ratios, thus realising the associated increased propulsive efficiency.
- Nota Adicional2
- Acronym in English: GTF.
- Contexto
- A second review (IER2) was requested at the CAEP/8 meeting (Montreal, 1-12 February 2010) to evaluate new technological advances with implications for aircraft noise reduction (e.g. open rotor, geared turbofans, blended wing body, etc.) to align with goal dates of 2020 (mid term) and 2030 (long term), as well as coordinate the technical approach with other panels of independent experts.
- Subárea
- Engine
- Français
- turboréacteur à réducteur