Fan rotor design for coincidence avoidance

摘要

A fan rotor capable of avoiding coincidence will include a fan hub comprising one or more slots each designed to receive a fan blade; and one or more fan blades disposed within the slots. One or more slots will comprise an RZ′ baseline and have one or more second fan blades disposed therein while another set of slots will have an RZ baseline having one or more first fan blades disposed therein. The tips of the second fan blades will be positioned at a distance farther from the fan hub than the tips of the first fan blades disposed, which when implemented in a turbofan engine will avoid coincidence occurrences.