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- W2330783972 abstract "This paper presents measurements of the spectral characteristics of acoustic waves scattered from turbulent, premixed flames. It extends measurements reported in a prior study. These measurements were obtained by directing monchromatic 4 37.5 kHz waves at a pilot stabilized, premixed flame and measuring the scattered wave characteristics. The measured acoustic spectra show a narrow, coherent spectral peak at the driving frequency, with lower amplitude, incoherent sidebands. The bandwidth of these sidebands increases roughly linearly with fdrive. This result suggests that these sidebands arise from a Doppler shift mechanism, likely due to random flame front movement. The spectral dependence of the low frequency sidebands are found to have a nearly universal relationship given by drive drive f f f C e / | | − − , where C is a coefficient with a value of ≈103. The high frequency sidebands have a similar behavior for fdrive − 2. The total power in the scattered incoherent field initially increases exponentially, and then appears to saturate with increase in frequency. An anomalous bump in this dependence is observed at fdrive~10 kHz. These general trends are in agreement with model predictions that treat the flame as a randomly evolving, corrugated front." @default.
- W2330783972 created "2016-06-24" @default.
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- W2330783972 date "2003-05-12" @default.
- W2330783972 modified "2023-09-27" @default.
- W2330783972 title "Acoustic Wave Scattering from Turbulent Premixed Flames" @default.
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- W2330783972 doi "https://doi.org/10.2514/6.2003-3183" @default.
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