Aleš Srna

Engineering Science, Senior Member of Technical Staff

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Engineering Science, Senior Member of Technical Staff

asrna@sandia.gov

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(925) 294-3854

Sandia National Laboratories, California
 P.O. Box 969
 Livermore, CA 94551-0969

Biography

Dr. Aleš Srna is the principal investigator in the Sandia Heavy-Duty Optical Engine Laboratory and leads a team of researchers responsible for heavy-duty diesel and gaseous fuels heavy-duty engine combustion research at Sandia National Laboratories. He is using optical and laser-based diagnostic techniques to build understanding of the processes governing efficiency and emissions formation. In this role, he works in close collaboration with US industry to address key knowledge barriers impeding the development of efficient and reliable heavy-duty powertrains. Currently, Aleš focuses on developing understanding of hydrogen and natural-gas engine combustion processes.

Education & Experience

Aleš received BSc in Physics from University of Ljubljana, Slovenia, in 2011, and MSc in Mechanical engineering from ETH Zurich, Switzerland, in 2014, followed by a PhD in mechanical engineering from ETH Zurich in 2018 for his work on natural gas-diesel dual-fuel combustion research. He continued his career as a postdoctoral researcher at the University of New South Wales (Prof. Kook and Prof. Hawkes), working on gasoline and hydrogen combustion in compression-ignition engines. Since 2020, Aleš leads the Sandia National Laboratories’ Heavy-Duty Diesel and Gaseous Fuels Optical Engine Laboratory.

Publications

  • Lee, T., Rajasegar, R., Srna, A., & Srna, A. (2024). Understanding the interplay between pilot fuel mixing and auto-ignition chemistry in hydrogen-enriched environment. Proceedings of the Combustion Institute, 40(1-4). https://doi.org/10.1016/j.proci.2024.105351 Publication ID: 124960
  • Rajasegar, R., Barbery, I., Novella, R., Srna, A., & Srna, A. (2023). On the Phenomenology of Hot-Spot Induced Pre-Ignition in a Direct-Injection Hydrogen-Fueled, Heavy-Duty, Optical-Engine [Conference Proceeding]. https://doi.org/10.4271/2023-32-0169 Publication ID: 127904
  • Rajasegar, R., Srna, A., & Srna, A. (2023). Effect of Spray Collapse on Mixture Preparation and Combustion Characteristics of a Spark-Ignition Heavy-Duty Diesel Optical Engine Fueled with Direct-Injected Liquefied Petroleum Gas (LPG) [Conference Proceeding]. SAE Technical Papers. https://doi.org/10.4271/2023-01-0323 Publication ID: 131416
  • Laichter, J., Kaiser, S.A., Rajasegar, R., Srna, A., & Srna, A. (2023). Optical Investigation of Mixture Formation in a Hydrogen-Fueled Heavy-Duty Engine with Direct-Injection [Conference Proceeding]. SAE International Journal of Advances and Current Practices in Mobility. https://doi.org/10.4271/2023-01-0240 Publication ID: 131448
  • Rajasegar, R., Srna, A., Barbery, I., Novella, R., & Novella, R. (2023). Exploring the EGR Dilution Limits of a Pre-Chamber Ignited Heavy-Duty Natural Gas Engine Operated at Stoichiometric Conditions – An Optical Study [Conference Proceeding]. https://doi.org/10.4271/2023-01-0256 Publication ID: 131436
  • Rajasegar, R., Srna, A., & Srna, A. (2022). Interaction and Ignition Process of Multiple Injections of Conventional and Oxygenated Fuels in an Optical, Heavy Duty Diesel Engine [Conference Presenation]. https://doi.org/10.2172/2005496 Publication ID: 119420
  • Yip, H.L., Srna, A., Wehrfritz, A., Kook, S., Hawkes, E.R., Chan, Q.N., & Chan, Q.N. (2022). A parametric study of autoigniting hydrogen jets under compression-ignition engine conditions. International Journal of Hydrogen Energy, 47(49), pp. 21307-21322. https://doi.org/10.1016/j.ijhydene.2022.04.253 Publication ID: 80797
  • Rajasegar, R., Srna, A., & Srna, A. (2022). A Review of Current Understanding of the Underlying Physics Governing the Interaction, Ignition and Combustion Dynamics of Multiple-injections in Diesel Engines [Conference Proceeding]. https://doi.org/10.4271/2022-01-0445 Publication ID: 109728
  • Rajasegar, R., Srna, A., & Srna, A. (2022). A Review of Current Understanding of the Underlying Physics Governing the Interaction, Ignition and Combustion Dynamics of Multiple-Injections in Diesel Engines [Conference Presenation]. SAE Technical Papers. https://doi.org/10.2172/2002256 Publication ID: 109988
  • Srna, A. (2021). I.1 Heavy-Duty Diesel Combustion (Sandia National Laboratories). https://doi.org/10.2172/1832284 Publication ID: 76673
  • Rajasegar, R., Srna, A., & Srna, A. (2021). Effect of Spray Collapse on Mixture Preparation and Combustion Characteristics of a Spark-Ignition Heavy-Duty Diesel Optical Engine Fueled with Direct-Injected Liquefied Petroleum Gas (LPG) [Conference Paper]. https://www.osti.gov/biblio/1864137 Publication ID: 78166
  • Rajasegar, R., Li, Z., Lind, T., Robert, G., Anderrson, O., Srna, A., Musculus, M.P.B., & Musculus, M.P.B. (2021). Effects of Annular Piston Bowl-Rim Cavity on Soot Emissions of Heavy-Duty Diesel Engine [Conference Presenation]. https://doi.org/10.2172/1854711 Publication ID: 77535
  • Srna, A., Rajasegar, R., Musculus, M.P.B., & Musculus, M.P.B. (2021). Effect of Spray Collapse on Mixture Preparation and Combustion Characteristics of a Spark-Ignition Direct-Injection Heavy-Duty Optical Engine Fueled with Liquefied Petroleum Gas (LPG) [Conference Presenation]. https://doi.org/10.2172/1891956 Publication ID: 76731
  • Rajasegar, R., Li, Z., Lind, T., Robert, G., Anderrson, O., Srna, A., Musculus, M.P.B., & Musculus, M.P.B. (2021). Effects of Annular Piston Bowl-Rim Cavity on Soot Emissions of Heavy-Duty Diesel Engine [Conference Paper]. https://www.osti.gov/biblio/1841813 Publication ID: 75090
Showing 10 of 14 publications.

Awards & Recognition

AwardYear
SAE certificate of excellence in oral presentation, awarded for presentation at the SAE
Powertrain, Fuels and Lubrication meeting		2014
Honorable mention award at the 2008 International Physics Olympiad, Vietnam2008