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- W2041420802 abstract "Detailed maps of “mixing delay time” (τd) and backmix concentration have been made for dispersion of helium tracer in carrier air, to investigate mixing patterns in isothermal combustion chamber models, for unswirled and swirled jets (single and double vortex). Normals to the iso-delay time surfaces are interpreted as “information flow paths” for optimum transit of input concentration changes throughout the chamber. The flow path is modeled by finite elements as a series of Perfectly Stirred Reactors, assumed variable in size, with convective forward and backmix flows (vf and vb) passing through each P.S.R in turn. Other models, based on separate forward and backmix streams with or without cross-mixing, were found to be inadequate. The accepted model satisfactorily predicted the characteristics of unsteady-state tracer response to cut-off, at any chamber location, and enabled prediction of τd for different backmix ratios and P.S.R. sizes. τd, and hence the stirring factor W, are shown to be unique functions of a Peclet Number defined in terms of a flow path length (L) and a mixing dispersion coefficient (Ds). Pe=vL/Ds, for a net flow velocity v. Pe is also related to the backmix ratio by Pe=−ln(vb/vf)N, where N is the number of P.S.R. cells in the flow path. The model is supported by experiment, particularly by way of agreement on values of W calculated directly from delay-time measurements in unsteady-state experiments, and calculated indirectly from Pe Numbers obtained in steady-state backmix experiments. The results indicate that global or macromixing is probably dominated by convective flows rather than turbulence. This also may be true of some aspects of combustion behavior." @default.
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- W2041420802 date "1973-01-01" @default.
- W2041420802 modified "2023-09-26" @default.
- W2041420802 title "Stirring factors in combustion chambers: A finite-element model of mixing along an “Information flow path”" @default.
- W2041420802 doi "https://doi.org/10.1016/s0082-0784(73)80054-2" @default.
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