The Q-FAN™, a new low pressure ratio, low noise propulsor, is currently under intensive development. Since the operating regime of the Q-FAN differs from that of the turbofan, the dominant noise sources also differ. This paper includes a summary of the results of extensive noise tests on a Q-FAN model, a discussion of the sources of various components of measured fan noise, and the results of analytical studies using a new theory to define minimum noise fan configurations.

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