Turbulence Properties of High and Low Swirl In-Cylinder Flows
Date Published: 2002-10-21
Paper Number:2002-01-2841
DOI: 10.4271/2002-01-2841
Citation:
Funk, C., Sick, V., Reuss, D., and Dahm, W., "Turbulence Properties of High and Low Swirl In-Cylinder Flows," SAE Technical Paper 2002-01-2841, 2002, doi:10.4271/2002-01-2841.
In previous work, Reuss [
1
] studied the cycle-to-cycle variation in the large-scale velocity structures of high and low-swirl in-cylinder flows of an IC engine. The vector flow fields were obtained from PIV measurements in a two-valve, pancake-shaped, Transparent Combustion Chamber (TCC) engine. In this study, the Reynolds-decomposed turbulence properties such as kinetic energy, length scales, and dissipation rate were directly measured for the two cases. The results demonstrate that, at TDC compression, the low-swirl flow is dominated by turbulence at the largest scales, whereas the high-swirl flow has a considerably lower turbulence Reynolds number. The dissipation rate and length scale calculated from mixing-length theory greatly exceeded the dissipation computed from the 2-D velocity-gradients and integral-length scales computed from the autocorrelation, respectively.
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