Abstract
In order to manufacture turbofan engine with lower fuel consumption, researchers are doing their best to seek higher bypass ratio turbofan, Ultra High Bypass Ratio Turbofan, which unfortunately have been suffered from incompatibility of spool speed problem. A novel concept with self-driving fan for high bypass ratio turbofan, which utilizes a selfdriving fan, may serve as a solution to this problem. At first, this paper discussed the problems caused by high bypass ratio, then the difficulties of Geared Turbofan was analyzed. After that, The potential advantages of the novel turbofan were put forward. Secondly, design philosophy in top level was discussed and some important criterions were proposed, with which the novel turbofan can be compared to modern concept like GTF. Finally, selfdriving fan system, the main component of the novel turbofan is sketchily design and its flow field is numerically simulated in order to demonstrate the feasibility of this new concept.
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