posted on 2016-11-24, 11:51authored byBen Reid, M. Gavaises, N. Mitroglou, Graham HargraveGraham Hargrave, Colin Garner, R.M. McDavid
The formation of vortex or 'string' cavitation has been visualised at pressures up to 2000 bar in an automotive-sized optical diesel fuel injector nozzle. The multi-hole nozzle geometry studied allowed observation of the hole-to-hole vortex interaction and, in particular, that of a bridging vortex in the sac region between the holes. Above a threshold Reynolds number, their formation and appearance during a 2 ms injection event was repeatable and independent of upstream pressure and cavitation number. In addition, two different hole layouts and threedimensional flow simulations have been employed to describe how, the relative positions of adjacent holes influenced the formation and hole-to-hole interaction of the observed string cavitation vortices, with good agreement between the experimental and simulation results being achieved.
Funding
This work has been technically and financially supported by Caterpillar Inc. and the UK Technology Strategy Board. Project No, TP/3/DSM/6/I/15289.
History
School
Mechanical, Electrical and Manufacturing Engineering
This work is made available according to the conditions of the Creative Commons Attribution 3.0 Unported (CC BY 3.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Publication date
2015
Notes
This paper was presented at 9th International Symposium on Cavitation (CAV2015), Lausanne, 6-9th December. This is an Open Access Article. It is published by Institute of Physics under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/