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Laser correlation velocimetry performance in diesel applications: spatial selectivity and velocity sensitivity

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Abstract

The characterization of diesel jets in the near field of the nozzle exit still presents challenges for experimenters. Detailed velocity measurements are needed to characterize diesel injector performance and also to establish boundary conditions for CFD codes. The present article examines the efficiency of laser correlation velocimetry (LCV) applied to diesel spray characterization. A new optical configuration based on a long-distance microscope was tested, and special care was taken to examine the spatial selectivity of the technique. Results show that the depth of the measurement volume (along the laser beam) of LCV extends beyond the depth of field of the imaging setup. The LCV results were also found to be particularly sensitive to high-speed elements of a spray. Results from high-pressure diesel jets in a back-pressure environment indicate that this technique is particularly suited to the very near field of the nozzle exit, where the flow is the narrowest and where the velocity distribution is not too large. It is also shown that the performance of the LCV technique is controlled by the filtering and windowing parameters used in the processing of the raw signals.

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Authors and Affiliations

  1. Laboratoire PRISME, Université d’Orléans, 8 rue Léonard de Vinci, 45072, Orleans, France

    Camille Hespel

  2. CORIA, UMR 6614, CNRS, Université et INSA de Rouen, Avenue de l’Université, 76801, Saint Etienne du Rouvray, France

    Jean-Bernard Blaisot, Matthieu Gazon & Gilles Godard

Authors
  1. Camille Hespel
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  2. Jean-Bernard Blaisot
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  3. Matthieu Gazon
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  4. Gilles Godard
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Correspondence to Jean-Bernard Blaisot.

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Hespel, C., Blaisot, JB., Gazon, M. et al. Laser correlation velocimetry performance in diesel applications: spatial selectivity and velocity sensitivity. Exp Fluids 53, 245–264 (2012). https://doi.org/10.1007/s00348-012-1286-4

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  • DOI: https://doi.org/10.1007/s00348-012-1286-4

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