Evaluation of vortex center location algorithms for Particle Image Velocimetry data in an optical light-duty compression ignition engine.

Paper #:
  • 2018-01-0209

Published:
  • 2018-04-03
Abstract:
Ever decreasing permitted emission levels and the necessity of more efficient engines demand a better understanding of in-cylinder phenomena. In swirl-supported compression ignition (CI) engines mean in-cylinder flow structures formed during the admission stroke deeply influence mixture preparation prior combustion, heat transfer and pollutant oxidation all of which could potentially improve engine performance. Therefore, the ability to characterize these mean flow structures is relevant for achieving performance improvements. CI mean flow structure is mainly described by a precessing vortex. The location of the vortex center is key for the characterization of the flow structure. Consequently, this work aims to evaluate algorithms that allows for the efficient location of the vortex center. The study is carried out on velocity fields measured using Particle Image Velocimetry (PIV) in an optical light-duty CI engine operated under motored conditions. The algorithms are evaluated both, with ensemble average and instant velocity fields, to evaluate the robustness of the different approaches
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