Active control of fan noise on a UHB engine
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چکیده
The model developed in this work was used to investigate the potential that active noise control techniques have for reducing fan noise on an ultra high bypass (UHB) turbofan engine. Active noise control is expected to perform differently on a UHB turbofan engine than on a conventional turbofan engine since the short and wide inlet duct inherent to the UHB engine promotes radiation from evanescent modes as well as interference between inlet and outlet radiation. These characteristics were shown in chapter 5 to impact the performance of an active control system. For this investigation, pure active control techniques as well as hybrid control techniques were studied. The results obtained are presented in this chapter.
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