Interior flow and near-nozzle spray development in a marine-engine diesel fuel injector
Artikel i vetenskaplig tidskrift, 2016

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.

Författare

J. Hult

MAN Diesel and Turbo AS

P. Simmank

MAN Diesel and Turbo AS

S. Matlok

MAN Diesel and Turbo AS

S. Mayer

MAN Diesel and Turbo AS

Zachary Falgout

Chalmers, Tillämpad mekanik, Förbränning

Mark Linne

Chalmers, Tillämpad mekanik, Förbränning

Experiments in Fluids

0723-4864 (ISSN) 1432-1114 (eISSN)

Vol. 57 4

Ämneskategorier

Maskinteknik

DOI

10.1007/s00348-016-2134-8