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- W2318219565 abstract "This paper describes an analysis of the characteristics of acoustic waves scattered by turbulent premixed flames with moving, convoluted fronts that have random and possibly fractal characteristics. Such interactions play an important role in the characteristic unsteadiness observed in turbulent combustion processes that occur in a wide range of processing, power generating and propulsion applications. The problem is posed with an integral formulation of the wave equation and assumes that the smallest scales of flame wrinkling are much larger than the acoustic wavelength. Thus, these results apply to high frequency wave scattering. Explicit solutions for the spatial and temporal characteristics of the scattered field are derived for cases where the characteristics of the flame surface are Gaussian. These characteristics are investigated for flames with single, multiple, and continuous (e.g. fractal) scales of wrinkling. It is shown that the spectral characteristics of the waves scattered from weakly corrugated flames are the same as those of the incident frequency shifted spectrum of the flame front position. Thus, these results suggest that ultrasonic scattering measurements can provide information about the spectrum of the flame front position. It is also shown, however, that as the flame roughness increases, the spectral characteristics of the scattered waves become increasingly scrambled relative to those of the flame itself, and thus provide less information about the temporal characteristics of the flame's movement. The paper closes with a discussion of additional possibilities for using the integral equation approach used in this paper to assess other characteristics of acoustic wave -turbulent flame interactions." @default.
- W2318219565 created "2016-06-24" @default.
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- W2318219565 date "2001-07-08" @default.
- W2318219565 modified "2023-09-27" @default.
- W2318219565 title "Analysis of Kirchhoff scattering of acoustic waves by turbulent flames" @default.
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- W2318219565 doi "https://doi.org/10.2514/6.2001-3850" @default.
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