Abstract

Abstract : A small pulse jet engine formerly used for heat transfer studies was operated briefly in a section of a model tunnel, the size of which is representative of those found in Vietnam. Because the noise had been a continual problem in doing the original heat transfer research, it was predicted that a larger version might be suitable for tunnel clearance, provided the sound intensity attenuation with distance from the tunnel's mouth was not too rapid. Free field tests as well as those in a single right angle of a 3 x 3 foot cross section duct showed that attenuation was not rapid. It was concluded that a larger engine suitably mounted at the tunnel might provide a lightweight, convenient noise source for the intended purpose.

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