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- W1990441373 abstract "Jet noise production is well known to be of a distributed nature along the jet, with high frequency noise components radiating from locations close to the nozzle exit and low frequency noise being produced farther downstream, around the end of the potential core. Such a distributed source implies that measurements need to be made at a significant distance from the source in order to be in the true geometric (acoustic) far field. The current study presents measurements of fully expanded M j = 1.5 jets operating with cold air and heat simulated at TTR = 2.2 made at various positions in the acoustic field, some short of the minimum distance required to be in the true geometric far field. A close look is taken at the details of the noise generation region in order to better understand the mismatch between spectra measured at various acoustic field radial locations. A processing method is presented to correct for near-field effects and efficiently compare near and far field spectra with unprecedented accuracy. This technique is then further used to clarify the nonlinear propagation effects that can be observed at the high frequency end of high speed jets noise." @default.
- W1990441373 created "2016-06-24" @default.
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- W1990441373 date "2012-12-01" @default.
- W1990441373 modified "2023-10-16" @default.
- W1990441373 title "Effects of Jet Noise Source Distribution on Acoustic Far-Field Measurements" @default.
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- W1990441373 doi "https://doi.org/10.1260/1475-472x.11.7-8.885" @default.
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