Evaluation of turbulent jet characteristic scales using joint statistical moments and an adaptive time-frequency analysis

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dc.contributor.authorProenca, Anderson
dc.contributor.authorMeloni, Stefano
dc.date.accessioned2022-04-04T13:09:30Z
dc.date.available2022-04-04T13:09:30Z
dc.date.issued2022-03-25
dc.description.abstractThis paper presents an analysis of turbulence characteristic scales and eddy convection velocity of jet flows computed using joint statistical moments, digital filters, and a modified version of the empirical mode decomposition (EMD). The ongoing aim of this study is to develop semi-empirical space-time cross-correlation models based on stationary statistics and jet physical lengths. Multivariate statistics are used to correlate jet properties to one-dimensional time series. The data available to this study were recorded from single-point and two-point hot-wire anemometry experiments carried out for a range of jet Mach numbers (0.2≤M≤0.8). Firstly, the jet eddy convection velocity, turbulence length, and time scales are computed using space-time cross-correlation functions. Isotropic flow and frozen turbulence hypothesis are then used to estimate the joint moments from single-point statistics in the fully developed turbulence region. An EMD-based decomposition method is presented and assessed in both the Gaussian and non-Gaussian signal regions. It is demonstrated that the artificially filtered signal reconstructs the physical properties of single and multi-point jet statistics. The relationship between central moments and joint moments presented here focuses on the region of high turbulence levels, which generates the vast majority of jet mixing noise produced by turbofan engines. Further analysis is required to extend this investigation to intermittent zones and other jet noise sources, such as jet-surface installation noise.en_UK
dc.identifier.citationProenca AR, Meloni S. (2022) Evaluation of turbulent jet characteristic scales using joint statistical moments and an adaptive time-frequency analysis. Fluids, Volume 7, Issue 4, March 2022, Article number 125en_UK
dc.identifier.issn2311-5521
dc.identifier.urihttps://doi.org/10.3390/fluids7040125
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17734
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectturbulence scalesen_UK
dc.subjectturbulent jeten_UK
dc.subjectjet noiseen_UK
dc.subjecthot-wireen_UK
dc.subjectEMDen_UK
dc.subjectfiltersen_UK
dc.titleEvaluation of turbulent jet characteristic scales using joint statistical moments and an adaptive time-frequency analysisen_UK
dc.typeArticleen_UK

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