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SprayMaster SLIPI
  • SprayMaster SLIPI

Quantitative Planar Droplet Sizing in Sprays

Since early 2000 LaVision provides a technique to measure the spatial distribution of averaged droplet size in a spray. The planar droplet sizing approach based on Laser Imaging produces 2D-resolved maps of Sauter Mean Diameter (D32) from spray images. Complementary to a pointwise measuring Phase Doppler Interferometer (PDI) the D32 technique reveals only averaged relative values, but instantaneously from a full plane. 

Applications

  • fuel injectors (gasoline direct injection, Diesel)
  • gas turbines
  • spray cooling
  • pulsed and continuously running atomizers and spray nozzles

The planar droplet sizing technique uses Laser Induced Fluorescence (LIF) and Mie scattering, recorded at the same time. The 2-dimensional D32-maps are generated from the ratio of both signals. This technique is well-known, but tends to suffer from multiple scattering of the laser light within the spray cone.

Structured illumination with SLIPI improves spray imaging

LaVision now provides the improved SLIPI method using structured laser illumination, which overcomes the limitation from multiple light scattering and cleans up the images by removing image artifacts. 2-dimensional spray density and size maps will reveal the undistorted spatial structure with unsurpassed quality. The hollow cone spray shown in the picture now appears hollow, and the droplet size map matches well with pointwise recorded Phase Doppler data (PDI).

2-dimensional Sauter Mean Diameter (D32) map of a hollow cone spray with conventional imaging (left) and from cleaned up images with SLIPI (right).

References:
Y.N.Mishra, E. Kristensson, E. Berrocal, “Reliable LIF/Mie droplet sizing in sprays using structured laser illumination planar imaging”, Optics Express, Vol. 22, Issue 4, pp. 4480-4492 (2014),http://dx.doi.org/10.1364/OE.22.004480

E. Berrocal, E. Kristensson, P. Hottenbach, M. Aldén , G. Grünefeld, “Quantitative imaging of a non-combusting diesel spray using structured laser illumination planar imaging”, Appl. Phys. B (2012) 109:683–694 

 

 

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