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• W2324477584 abstract "In recent work on coplanar, coaxial jet noise prediction, single stream noise methods have been successfully employed to predict the noise contribution of each region of the jet plume and the results summed to calculate the total far-field noise spectrum. The objective of the present work is to extend this approach to the ‘buried’ nozzle configurations, in which initial mixing is constrained within a short pipe before both flows exit through a common nozzle. Two basic configurations are considered, the unforced, annular or confluent mixer, in which the primary nozzle is of circular cross-section and the lobed or forced mixer, in which the primary nozzle is of lobed form designed to promote more rapid mixing between the primary and secondary flows prior to the final nozzle. For the annular configuration very little mixing takes place between the primary and final nozzle exit planes. The mixing takes place externally, and the noise is consistent with the acoustic modelling described previously. The lowest frequencies are controlled by the fully mixed flow, while the remainder of the spectrum is due to the ‘effective jet’, that is the free mixing of the primary and secondary flows. For the forced or lobed mixer, the noise reduction at low frequencies, relative to the annular, is due to the fact that the primary flow has almost ‘mixed out’ prior to the final nozzle; an observation confirmed by aerodynamic surveys. The low frequency decrease is therefore limited to the levels of noise anticipated for the fully mixed flow. The penalty paid for forced mixing is an increase in noise at higher frequencies, which increases with increased penetration. The spectrum of this forced mixer noise source appears to correlate with the mixed jet Strouhal number and velocity, except for the highest Mach number condition, where an additional source is identified, termed the ‘high Mach number lift’. An initial modelling of the forced mixer noise source is presented, based on a mixed jet with an enhanced turbulence level, which is in reasonable agreement with the measured data." @default.
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• W2324477584 date "2004-05-10" @default.
• W2324477584 modified "2023-09-27" @default.
• W2324477584 title "A Contribution to the Understanding and Prediction of Jet Noise Generation in Forced Mixers" @default.
• W2324477584 cites W2058218581 @default.
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• W2324477584 doi "https://doi.org/10.2514/6.2004-2897" @default.
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