Abstract
The theory, which utilizes a large-blade-count approximation, provides simple closed-form expressions for the radiation efficiency integrals of all three types of propeller noise sources. Comparisons with a method that uses numerical integration of the radiation efficiency integrals indicate that sound levels predicted by the asymptotic theory are quite accurate. Asymptotic calculations also confirm the conclusions by earlier investigators that for high-speed propellers the noise radiated by the Lighthill quadrupole source is substantial when compared with the noise radiated by blade thickness and loading sources
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