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Determination of the optical depth of a DI diesel spray

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Abstract

The optical depth is responsible of limiting the optical diagnostic using visible wavelength in the sprays. This paper proposes to measure the optical depth directly in a real Diesel spray through line-of-sight laser extinction measurements. This easily reproducible method which does not require expensive or complex optical techniques is detailed and the measurement procedure is presented in this paper. As diesel sprays are mostly optically thick, the measurements in the denser region are not reliable and a fuel concentration model has been used to derive the results to the entire spray. This work provides values of SMD at different distance from the nozzle tip depending on the specific parameters like injection pressure or discharge density. The values extracted from a combined experimental/computational approach have been compared to PDPA measurements under the same testing conditions. The results have shown that the maximum optical depth was higher than 10 and that an increase of the injection pressure led to higher τ values. The SMD values appeared to be below the results measured by the PDPA and the droplet diameter showed to be the main responsible of the optical depth of the jet under the tested conditions.

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Authors and Affiliations

  1. CMT Motores Termicos, Universidad Politecnica de Valencia, Valencia, Spain

    Francisco Payri, Jose Vicente Pastor, Raul Payri & Julien Manin

Authors
  1. Francisco Payri
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  2. Jose Vicente Pastor
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  3. Raul Payri
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  4. Julien Manin
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Corresponding author

Correspondence to Raul Payri.

Additional information

This paper was recommended for publication in revised form by Associate Editor Kyoung Doug Min

Francisco Payri received his degree in Mechanical Engineering from the Technical University of Madrid in 1971, and his PhD from the same University in 1973. Teaching activities started in 1972 at the Escuela Técnica Superior de Ingenieros Industriales (Mechanical Engineering School) in Madrid. In 1979 he moved to the Technical University of Valencia, becoming a full professor in 1983. Prof. F. Payri has been the head of CMT Motores since 1986. Member of the Scientific Coordination Commission of the Institut Français du Pétrole (France) since 1999 and Fellow Member by the Society of Automotive Engineers of the USA since 2008

José V. Pastor graduated in 1991 as a Physicist, completed his PhD thesis on internal aerodynamics in Diesel engines in 1996, and has participated in more than 100 R&D projects with public or private funding in the automotive sector including several contracts funded by the European Commission. Currently he is a permanent professor at Universidad Politécnica de Valencia and leads a research division on Optical Diagnostics at CMT-Motores Térmicos. He has published more than 50 papers in scientific journals and renowned international conferences.

Raul Payri graduated as Mechanical Engineer in 1995, received his phD in Mechanical Engineering in 1999 from the CMT-Motores Termicos (Thermal Engines), Universidad Politecnica de Valencia, Spain, where he has been professor since 2000. Over the last ten years he has coordinated and participated in 35 competitive projects funded by European Union and national administrations and more than 60 R&D projects funded by the industry. He has published 32 articles in international Journals and 35 papers at international and national conferences. He has been supervisor of four Doctoral Theses. Nowadays Dr. R. Payri is the head of the injection research group at CMT-Motores Termicos

Julien Manin graduated as a mechanical engineer in a state school in France in 2006. He got a Master’s degree in vibroacoustic the same year and a Master of Science in transportation systems in 2009. Since 2007, he is researcher at Universidad Politecnica de Valencia, Spain where he plans to finish his PhD in 2010. He has worked in the field of sprays and laser diagnostics and participated in several research projects with renowned institutes. He was granted by the Spanish Ministry of Science and Innovations and he is an active member of the ECN Working Group.

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Payri, F., Pastor, J.V., Payri, R. et al. Determination of the optical depth of a DI diesel spray. J Mech Sci Technol 25, 209–219 (2011). https://doi.org/10.1007/s12206-010-1024-x

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  • DOI: https://doi.org/10.1007/s12206-010-1024-x

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