City, University of London Institutional Repository Citation: Lockett, R. D. ORCID: 0000-0002-7883-6241 and Bonifacio, A. (2019). Hydrodynamic Luminescence in a Model Diesel Injector Return Valve. International Journal of Engine Research, doi: 10.1177/1468087419870421 This is the accepted version of the paper. This version of the publication may differ from the final published version. Permanent repository link: http://openaccess.city.ac.uk/id/eprint/22568/ Link to published version: http://dx.doi.org/10.1177/1468087419870421 Copyright and reuse: City Research Online aims to make research outputs of City, University of London available to a wider audience. Copyright and Moral Rights remain with the author(s) and/or copyright holders. URLs from City Research Online may be freely distributed and linked to. City Research Online: http://openaccess.city.ac.uk/ publications@city.ac.uk City Research Online