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Also, non-uniform fan strength distribution models have been proposed and investigated, which shows that the strength distribution of the fan increasing in the direction of the fan blade tip facilitates wake expansion and requires less power than the fan strength distribution which increases in the direction of the blade hub. Current results show that increasing diffuser angle of the duct improves the propulsion efficiency of the ducted fan system, while the inlet geometry has little effect on it. The fan in the system is modeled as an actuator disk, which provides jumps in stagnation enthalpy and stagnation density across it.
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