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Experimental Assessment of Reynolds-Averaged Dissipation Modeling in Engine Flows
Technical Paper
2007-24-0046
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The influence of the constant C3, which multiplies the mean flow divergence term in the model equation for the turbulent kinetic energy dissipation, is examined in a motored diesel engine for three different swirl ratios and three different spatial locations. Predicted temporal histories of turbulence energy and its dissipation are compared with experimentally-derived estimates. A “best-fit” value of C3 = 1.75, with an approximate uncertainty of ±0.3 is found to minimize the error between the model predictions and the experiments.
Using this best-fit value, model length scale behavior corresponds well with that of measured velocity-correlation integral scales during compression. During expansion, the model scale grows too rapidly. Restriction of the model assessment to the expansion stroke suggests that C3 = 0.9 is more appropriate during this period.
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Citation
Miles, P., RempelEwert, B., and Reitz, R., "Experimental Assessment of Reynolds-Averaged Dissipation Modeling in Engine Flows," SAE Technical Paper 2007-24-0046, 2007, https://doi.org/10.4271/2007-24-0046.Also In
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