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• W2069205607 abstract "An acoustic transfer function relating combustion noise and turbine exit noise in the presence of enclosed ambient core noise is investigated using a dynamic system model and an acoustic system model for the particular turbofan engine studied and for a range of operating conditions. Measurements of cross-spectra magnitude and phase between the combustor and turbine exit and auto-spectra at the turbine exit and combustor are used to show the presence of indirect and direct combustion noise over the frequency range of 0-400 Hz. The procedure used evaluates the ratio of direct to indirect combustion noise. The procedure used also evaluates the post-combustion residence time in the combustor which is a factor in the formation of thermal NO(x) and soot in this region. These measurements are masked by the ambient core noise sound field in this frequency range which is observable since the transducers are situated within an acoustic wavelength of one another. An ambient core noise field model based on one and two dimensional spatial correlation functions is used to replicate the spatially correlated response of the pair of transducers. The spatial correlation function increases measured attenuation due to destructive interference and masks the true attenuation of the turbine." @default.
• W2069205607 created "2016-06-24" @default.
• W2069205607 creator A5062412318 @default.
• W2069205607 date "2012-06-01" @default.
• W2069205607 modified "2023-09-27" @default.
• W2069205607 title "Spatial correlation in the ambient core noise field of a turbofan engine" @default.
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• W2069205607 doi "https://doi.org/10.1121/1.4714359" @default.
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