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Interior flow and near-nozzle spray development in a marine-engine diesel fuel injector

J. Hult ; P. Simmank ; S. Matlok ; S. Mayer ; Zachary Falgout (Institutionen för tillämpad mekanik, Förbränning) ; Mark Linne (Institutionen för tillämpad mekanik, Förbränning)
Experiments in Fluids (0723-4864). Vol. 57 (2016), 4,
[Artikel, refereegranskad vetenskaplig]

A consolidated effort at optically characterising flow patterns, in-nozzle cavitation, and near-nozzle jet structure of a marine diesel fuel injector is presented. A combination of several optical techniques was employed to fully transparent injector models, compound metal-glass and full metal injectors. They were all based on a common real-scale dual nozzle hole geometry for a marine two-stroke diesel engine. In a stationary flow rig, flow velocities in the sac-volume and nozzle holes were measured using PIV, and in-nozzle cavitation visualized using high-resolution shadowgraphs. The effect of varying cavitation number was studied and results compared to CFD predictions. In-nozzle cavitation and near-nozzle jet structure during transient operation were visualized simultaneously, using high-speed imaging in an atmospheric pressure spray rig. Near-nozzle spray formation was investigated using ballistic imaging. Finally, the injector geometry was tested on a full-scale marine diesel engine, where the dynamics of near-nozzle jet development was visualized using highspeed shadowgraphy. The range of studies focused on a single common geometry allows a comprehensive survey of phenomena ranging from first inception of cavitation under well-controlled flow conditions to fuel jet structure at real engine conditions.



Denna post skapades 2016-04-29.
CPL Pubid: 235607

 

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Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Förbränning

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur