Investigation of coking diesel injector spray nozzles in operation Aslan Apazhev, Yuri Shekikhachev, Vladimir Batyrov, Lyudmila Shekikhacheva and Anzor Bolotokov E3S Web Conf., 262 (2021) 01020 Published online: 24 May 2021 DOI: 10.1051/e3sconf/202126201020