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Research Papers: Multiphase Flows

Nozzle Geometry and Injection Duration Effects on Diesel Sprays Measured by X-Ray Radiography

[+] Author and Article Information
A. L. Kastengren1

Center for Transportation Research, Argonne National Laboratory, Argonne, IL 60439akastengren@anl.gov

C. F. Powell

Center for Transportation Research, Argonne National Laboratory, Argonne, IL 60439

T. Riedel

 Diesel Systems-Commercial Vehicles∕Engineering Systems Application, Robert Bosch, GmbH, Stuttgart 70049, Germany

S.-K. Cheong, K.-S. Im, X. Liu, Y. J. Wang, J. Wang

Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439

1

Corresponding author.

J. Fluids Eng 130(4), 041301 (Apr 04, 2008) (12 pages) doi:10.1115/1.2903516 History: Received May 23, 2007; Revised October 31, 2007; Published April 04, 2008

X-ray radiography was used to measure the behavior of four fuel sprays from a light-duty common-rail diesel injector. The sprays were at 250bar injection pressure and 1bar ambient pressure. Injection durations of 400μs and 1000μs were tested, as were axial single-hole nozzles with hydroground and nonhydroground geometries. The X-ray data provide quantitative measurements of the internal mass distribution of the spray, including near the injector orifice. Such measurements are not possible with optical diagnostics. The 400μs sprays from the hydroground and nonhydroground nozzles appear qualitatively similar. The 1000μs spray from the nonhydroground nozzle has a relatively consistent moderate width, while that from the hydroground nozzle is quite wide before transitioning into a narrow jet. The positions of the leading- and trailing-edges of the spray have also been determined, as has the amount of fuel residing in a concentrated structure near the leading edge of the spray.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

Projected density for long-duration injections 328μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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Figure 7

Projected density for long-duration injections 641μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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Figure 8

Projected density for long-duration injections 1068μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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Figure 9

Example distributions of the projected density across the spray (in the y direction) from the hydroground nozzle 328μs after SOI at axial distances from the nozzle of (a) x=0.2mm and (b) x=10.0mm

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Figure 10

FWHM of long-duration sprays, as determined by Gaussian fits, at selected times after SOI. Lines connecting the data are guides for the eye.

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Figure 11

Cone angle of the long-duration sprays versus time after SOI. Lines connecting the data are guides for the eye.

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Figure 12

TIM for the short-duration spray from the nonhydroground nozzle at selected times after SOI. Lines connecting the data are guides for the eye.

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Figure 13

TIM for the long-duration spray from the hydroground nozzle at selected times after SOI. Lines connecting the data are guides for the eye.

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Figure 14

Spray leading-edge penetration: (a) spray leading-edge position versus time; (b) spray leading-edge speed vesus time

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Figure 15

Comparison of edge-detection and TIM-based methods for locating trailing edge for the long-duration sprays

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Figure 16

Trailing-edge position versus time

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Figure 17

Method for spray partitioning

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Figure 18

Fraction of the fuel mass located in the leading-edge structure versus time

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Figure 1

Experimental layout

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Figure 2

Measurement locations for the long-duration spray from the hydroground nozzle

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Figure 3

Projected density for short-duration injections 77μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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Figure 4

Projected density for short-duration injections 206μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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Figure 5

Projected density for short-duration injections 365μs after SOI; (a) Hydroground Nozzle (b) Nonhydroground Nozzle

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