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Title: Comparison of the Optical Connectivity Method to X-Ray spray measurements in the near field of a diesel injector

Abstract

For diesel sprays, the primary breakup processes are only rarely understood due to the high optical density and the resulting difficulties to measure them with extremely high spatial and sufficient temporal resolution. The Optical Connectivity Method (OCM) has been proposed in the last years to allow the determination of the breakup length of the connected liquid core, thus giving a measurement quantity of the primary breakup. In this research, an improved optical setup of the OCM is applied to a three-hole test injector nozzle where several measurement techniques are compared currently under well-defined conditions up to 100 MPa injection pressure. In this work, the direct comparison with X-Ray measurements done at the Advanced Photon Source of the Argonne National Laboratory will be described. This allows an evaluation of the OCM technique and a comparison of the different measurement quantities in the first 500 μm range of the spray. The structure of the spray is measured by X-Ray phase contrast imaging and the fuel mass distribution is measured by X-Ray absorption imaging. A detailed comparison of the two X-Ray techniques and the OCM technique has been possible for the first time. It is found that the measurement data of the spraymore » near field are very congruent with all three methods. Due to this comparison, the measurement of the non-perturbed length, which describes the distance from the nozzle orifice up to the point where the formation of surface disturbances is starting, by the OCM is validated for the first time. Within this non-perturbed length of the spray, the OCM signal is weak before it starts to illuminate from the scattering of the perturbed surface. Hence, the OCM technique can deliver two characteristic length scales, the non-perturbed length and the breakup length, characterizing the primary spray breakup.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1]
  1. Univ. of Hanover, Hannover (Germany)
  2. Argonne National Laboratory (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Lemont, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1503281
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 37; Journal Issue: 3; Journal ID: ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; diesel injection; laser diagnostics; primary break-up; spray near field; x-Ray diagnostics

Citation Formats

Gröger, Karsten, Kaiser, Max, Wang, Jin, and Dinkelacker, Friedrich. Comparison of the Optical Connectivity Method to X-Ray spray measurements in the near field of a diesel injector. United States: N. p., 2018. Web. doi:10.1016/j.proci.2018.09.017.
Gröger, Karsten, Kaiser, Max, Wang, Jin, & Dinkelacker, Friedrich. Comparison of the Optical Connectivity Method to X-Ray spray measurements in the near field of a diesel injector. United States. doi:10.1016/j.proci.2018.09.017.
Gröger, Karsten, Kaiser, Max, Wang, Jin, and Dinkelacker, Friedrich. Thu . "Comparison of the Optical Connectivity Method to X-Ray spray measurements in the near field of a diesel injector". United States. doi:10.1016/j.proci.2018.09.017.
@article{osti_1503281,
title = {Comparison of the Optical Connectivity Method to X-Ray spray measurements in the near field of a diesel injector},
author = {Gröger, Karsten and Kaiser, Max and Wang, Jin and Dinkelacker, Friedrich},
abstractNote = {For diesel sprays, the primary breakup processes are only rarely understood due to the high optical density and the resulting difficulties to measure them with extremely high spatial and sufficient temporal resolution. The Optical Connectivity Method (OCM) has been proposed in the last years to allow the determination of the breakup length of the connected liquid core, thus giving a measurement quantity of the primary breakup. In this research, an improved optical setup of the OCM is applied to a three-hole test injector nozzle where several measurement techniques are compared currently under well-defined conditions up to 100 MPa injection pressure. In this work, the direct comparison with X-Ray measurements done at the Advanced Photon Source of the Argonne National Laboratory will be described. This allows an evaluation of the OCM technique and a comparison of the different measurement quantities in the first 500 μm range of the spray. The structure of the spray is measured by X-Ray phase contrast imaging and the fuel mass distribution is measured by X-Ray absorption imaging. A detailed comparison of the two X-Ray techniques and the OCM technique has been possible for the first time. It is found that the measurement data of the spray near field are very congruent with all three methods. Due to this comparison, the measurement of the non-perturbed length, which describes the distance from the nozzle orifice up to the point where the formation of surface disturbances is starting, by the OCM is validated for the first time. Within this non-perturbed length of the spray, the OCM signal is weak before it starts to illuminate from the scattering of the perturbed surface. Hence, the OCM technique can deliver two characteristic length scales, the non-perturbed length and the breakup length, characterizing the primary spray breakup.},
doi = {10.1016/j.proci.2018.09.017},
journal = {Proceedings of the Combustion Institute},
issn = {1540-7489},
number = 3,
volume = 37,
place = {United States},
year = {2018},
month = {11}
}

Journal Article:
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