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Ballistic imaging of the near field in a diesel spray

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Abstract

We have developed an optical technique called ballistic imaging to view breakup of the near-field of an atomizing spray. In this paper, we describe the successful use of a time-gated ballistic imaging instrument to obtain single-shot images of core region breakup in a transient, single hole atomizing diesel fuel spray issuing into one atmosphere. We present a sequence of images taken at the nozzle for various times after start of injection, and a sequence taken at various positions downstream of the nozzle exit at a fixed time. These images contain signatures of periodic behavior, voids, and entrainment processes.

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Abbreviations

Core region:

The near field spray zone that is characterized by large (>100 μm) fluid structures near the axis that generate primary droplets in the process of breakup

Primary breakup:

The destruction of the core region (among some researchers, “primary breakup” implies a specific breakup mechanism, but we make no implication regarding mechanisms)

Primary droplets:

Droplets that have clearly originated from the core

We ℓ :

Weber number of the liquid, We ℓ≡ (ρℓ U 2 L)/σℓ

Oh :

Ohnesorge number, \(Oh\equiv \mu_\ell/\sqrt{\rho_\ell \sigma_\ell L}\)

ρℓ :

Liquid density (kg/m3)

ρ g :

Gas density (kg/m3)

U :

Characteristic velocity (m/s)

L :

Characteristic length (usually nozzle exit diameter) (m)

σℓ :

Surface tension of the liquid (N/m)

μℓ :

Viscosity of the liquid (kg/ms)

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Acknowledgements

Support for this work is provided by a grant from the Army Research Office via ARO Project Number DAAD19-02-1-0221. The equipment used and partial student support were funded by an NSF Major Research Instrumentation Grant number CTS-9711889. The authors wish to thank Lambda Research for free use of the OSLO software through the University Gratis program.

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Authors and Affiliations

  1. Department of Combustion Physics, Lund Institute of Technology, P.O. Box 118, 221 00, Lund, Sweden

    Mark Linne & Megan Paciaroni

  2. Division of Engineering, Colorado School of Mines, Golden, CO, 80401, USA

    Tyler Hall & Terry Parker

Authors
  1. Mark Linne
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  2. Megan Paciaroni
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  3. Tyler Hall
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  4. Terry Parker
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Correspondence to Mark Linne.

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Linne, M., Paciaroni, M., Hall, T. et al. Ballistic imaging of the near field in a diesel spray. Exp Fluids 40, 836–846 (2006). https://doi.org/10.1007/s00348-006-0122-0

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  • DOI: https://doi.org/10.1007/s00348-006-0122-0

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