Abstract
Autocorrelation (AC) analysis is useful in examining temporal relationships in a waveform and can be used to provide insight into properties of jet noise. Using techniques developed by Harker et al. [J. Acoust. Soc. Am. 133, EL458 (2013)] for full-scale jet data, AC analysis has been applied to unheated, laboratory-scale jet noise data. To more consistently compare the AC at various locations around the jet, it is important to account for the spatial variation in the spectrum by scaling with the peak frequency. In addition to this frequency scaling, the spatiotemporal variations in the autocorrelation are more plainly seen when an envelope function is applied. Calculated AC envelope functions from measured data are compared with theoretical curves for fine and large-scale jet noise radiation. Results are compared against those from a full-scale, military jet aircraft. [Work supported by ONR.]
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