Dr. G.A. (Alexis) Bohlin
Dr. G.A. (Alexis) Bohlin
Alexis Bohlin is an Assistant Professor at Propulsion and Power within the department of AWEP at the Faculty of Aerospace Engineering. He earned his PhD in Physics 2012 at Lund University with his work on CARS spectroscopy in reacting flows. Before coming to Delft in 2016, he spent 3.5 years as a postdoctoral appointee at the Combustion Research Facility of Sandia National Laboratories developing ultrafast coherent Raman imaging in multidisciplinary combustion research. In 2017, he received a VIDI grant from the Netherlands Organization for Scientific Research (NWO).
Alexis Bohlin works on developing ultrafast non-linear optical spectroscopy in combustors and bioreactors and the advancement and utilization of renewable fuels in aero propulsion.
Ultrafast Diagnostics Advancing Renewable Aero Propulsion
CARS imaging is one state-of-the-art laser diagnostics in reacting flows. It has been proven in laboratory flames for spatially correlated chemical detection and temperature which are the most important scalars to inform on the combustion reaction and to understand the pollutant formation. In this project, we continue pushing forward CARS imagery, with new unprecedented simultaneous resolution in space, spectrum and time. We build these ultrafast optical tools to be robust and utilized at combustors and bioreactors. The multidimensional resolution is important, since deep insight into multiscale turbulent chemical interactions can only be obtained from spectroscopic measurements garnered in spatial and temporal correlation. The application of these advanced tools in specially designed experiments at the combustor and bioreactor is to gain access to relatively fast-dynamics of chemical- and biological processes and a possibility to monitor these processes in-situ at video rates in close to industrial conditions. The goal of this research is to progress fundamental understanding in distributed auto-ignition combustion modes for reduced emission, and to boost the control of fermentation reactions of the bioreactor, which ultimately leading to step-in-progress cleaner combustion technology and carbon-neutral aero propulsion.
Funding is provided through a VIDI grant, which is a funding instrument in the Innovational Research Incentives Scheme of the Netherlands Organization for Scientific Research (NWO).
5 Selected Publications
L. Castellanos, F. Mazza, D. Kliukin, A. Bohlin, Pure-rotational 1D-CARS spatiotemporal thermometry obtained with a single regenerative amplifier system, Opt. Lett. 45, 4662-4665 (2020). [Editor’s Pick] DOI: 10.1364/OL.398982
A. Bohlin, C. J. Kliewer, Direct coherent Raman temperature imaging and wideband chemical detection in a hydrocarbon flat flame, J. Phys. Chem. Lett. 6, 643-649 (2015). DOI: 10.1021/acs.jpclett.5b00014
A. Bohlin, M. Mann, B. D. Patterson, A. Dreizler, C. J. Kliewer, Development of two-beam femtosecond/picosecond one-dimensional rotational coherent anti-Stokes Raman spectroscopy: time-resolved probing of flame wall interactions, Proc. Combust. Inst., 35, 3723-3730 (2015). DOI:10.1016/j.proci.2014.05.124
A. Bohlin, C. J. Kliewer, Diagnostic Imaging in Flames with Instantaneous Planar Coherent Raman Spectroscopy, J. Phys. Chem. Lett. 5, 1243-1248 (2014). DOI: 10.1021/jz500384y
A. Bohlin, P.-E. Bengtsson, Rotational CARS thermometry in diffusion flames: On the influence of nitrogen spectral line-broadening by CH4 and H2, Proc. Combust. Inst., 33, 823-830 (2011). DOI: 10.1016/j.proci.2010.05.023
Alexis Bohlin Google Scholar Citations: publication list
High-temperature rotational-vibrational O2[sbnd]CO2 coherent Raman spectroscopy with ultrabroadband femtosecond laser excitation generated in-situ
Francesco Mazza / Nathan Griffioen / Leonardo Castellanos / Dmitrii Kliukin / Alexis Bohlin
Cascaded coherent anti-Stokes Raman scattering for high-sensitivity number density determination in the gas phase
Dmitrii Kliukin / Francesco Mazza / Leonardo Castellanos / Alexis Bohlin
Coherent Raman imaging thermometry with in-situ referencing of the impulsive excitation efficiency
Francesco Mazza / Leonardo Castellanos / Dmitrii Kliukin / Alexis Bohlin
Pure-rotational 1D-CARS spatiotemporal thermometry with a single regenerative amplifier system
Leonardo Castellanos / Francesco Mazza / Dmitrii Kliukin / Alexis Bohlin