Abstract
Previous studies have shown that increasing the annulus width of a conventional coaxial nozzle with constant bypass velocity will lower the noise level. In the present model‐scale study, the annulus was shaped by an eccentric mounting of the annular nozzle with respect to the conical core nozzle. Acoustic measurements were made in the flyover plane below the widest portion of the annulus and at 90° and 180° from this point. The model‐scale spectra are scaled up to engine size (1.07‐m diameter) and the perceived noise levels for the eccentric and concentric coaxial nozzles are compared over a range of operating conditions. The implications of the acoustic benefits derived from the eccentric nozzle to practical applications are discussed.
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