Unsteady forces and noise from a fan-in-wing model operated in cross flow are investigated. Based on experimentally determined inlet and outlet flow distortions the unsteady forces on the rotor blades are determined analytically taking into account the effects of blade angle of attack and blade camber. Results of unsteady forces due to flow distortions are compared with those on the rotor blades due to potential interaction with the stator vanes. The calculated unsteady forces on rotor blades are used to calculate the discrete frequency noise emission characteristics of the fan. The predicted sound pressure levels are compared with those due to potential and viscous interactions. It is shown that the predicted unsteady forces on the rotor blades due to cross velocity do not significantly contribute to the noise generated by the fan.

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