Based on time-resolved PIV (TRPIV) data, a new proper orthogonal decomposition (POD) application is developed to recover the time information between two consecutive PIV time measurements. Indeed, by performing a POD over the full PIV velocity field snapshots, POD coefficients are time-interpolated providing a continuous space–time description of the turbulent flow field. An application of this interpolation method is proposed from TRPIV velocity fields obtained in the tumble plane of in-cylinder engine flow. Available flow dynamical representations then allow some cycle-to-cycle variation analyses based on the instantaneous flow pictures as well as on the statistical data. It has been shown that the cyclic variabilities increase during the compression process and at the end of the compression stage, they decrease to reach those obtained during the intake process.
Experiments in Fluids – Springer Journals
Published: Sep 14, 2005
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