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Christopher Willman

Lecturer in Engineering Science

My research involves the design and application of optical diagnostic techniques for flow measurements. Fluid flows are critical to a wide variety of fields, from thermal propulsion systems in the transport sector to inhaler sprays for respiratory drug delivery. The remote nature of optical techniques enables non-invasive measurements of flow properties in locations or at timescales which are inaccessible to physical probes.

I have a particular interest in developing novel measurement capabilities, such as real-time remote measurement of local gas pressure and temperature using Laser-Induced Grating Scattering (LIGS) and application of LIGS thermometry in transient, two-phase inhaler sprays. I am also investigating mixing processes and flame propagation inside internal combustion engines using Particle-Image Velocimetry and Laser-Induced Fluorescence, contributing to the design of higher efficiency and reduced emissions powertrains by validating Computational Fluid Dynamics simulations.

Chris studied Physics at the University of Oxford, graduating with an MPhys in 2012 and completing a DPhil titled “Laser diagnostics for spatially resolved thermometry in combustion and flows” in 2016. Since 2016 he has worked as a postdoctoral researcher in the Engineering Science department at Oxford as a member of the Thermal Propulsion Systems research group ( Chris joined St Hugh’s College as a lecturer in 2019 following a year as director of studies for Engineering at Harris Manchester College.

Recent publications:
C. Willman, L. M. Le Page, P. Ewart and B. A. O. Williams, “Pressure measurement in gas flows using laser-induced grating lifetime”, Appl. Opt., doc. ID 419973, (posted 7
April 2021, in press).

L. Shen, C. Willman, R. Stone, T. Lockyer, R. Magnanon, G. Virelli, “On the use of crank angle-resolved particle image velocimetry (PIV) data for the validation of Reynolds averaged Navier-Stokes (RANS) simulations during the intake process of a spark ignition direct injection (SIDI) engine.” Int. J. Engine Research, doc ID IJER-20-0351, (accepted, in press).

L. Shen, C. Willman, R. Stone, T. Lockyer, R. Magnanon and G. Virelli, “Multi-Plane PIV Measurements in a Gasoline Direct Injection Engine,” SAE Int. J. Adv. & Curr. Prac. in Mobility 3(1):223-239, (2021).

C. Willman, B. Scott, R. Stone and D. Richardson “Quantitative metrics for comparison of in-cylinder velocity fields using particle image velocimetry”, Exp. Fluids 61, 62 (2020).

Lecturer in Engineering Science
Academic - Fellows & Lecturers