Multicycle large-eddy simulations (LES) of motored flow in an optical engine housed at the University of Michigan have been performed. The simulated flow field is compared against particle image velocimetry (PIV) data in several cutting planes. Circular statistical methods have been used to isolate the contributions to overall turbulent fluctuations from changes in flow direction or magnitude. High levels of turbulence, as indicated by high velocity root mean square (RMS) values, exist in relatively large regions of the combustion chamber. But the circular standard deviation (CSD), a measure of the variability in flow direction independent of velocity magnitude, is much more limited to specific regions or points, indicating that much of the turbulence is from variable flow magnitude rather than variable flow direction. Using the CSD is also a promising method to identify critical points, such as vortex centers or stagnation points, within the flow, which may prove useful for future engine designers.
Understanding In-Cylinder Flow Variability Using Large-Eddy Simulations
Contributed by the IC Engine Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received February 2, 2016; final manuscript received February 19, 2016; published online April 19, 2016. Editor: David Wisler.
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Van Dam, N., and Rutland, C. (April 19, 2016). "Understanding In-Cylinder Flow Variability Using Large-Eddy Simulations." ASME. J. Eng. Gas Turbines Power. October 2016; 138(10): 102809. https://doi.org/10.1115/1.4033064
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