Near-Nozzle Structure of Diesel Sprays Affected by Internal Geometry of Injector Nozzle: Visualized by Single-Shot X-ray Imaging Argonne National Laboratory

Format:

Conference/Event

Author/Creator:

Liu, Liu, author.

Contributor:

Fezzaa, Kamel

Im, Kyoung-Su

Lai, Ming-Chia

Wang, Jin

Wang, Yuejie

Xie, Xing-Bin

Conference Name:

SAE 2010 World Congress & Exhibition (2010-04-13 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2010

Summary:

By taking advantage of high-intensity and high-brilliance x-ray beams available at the Advanced Photon Source (APS), ultrafast (150 ps) propagation-based phase-enhanced imaging was developed to visualize high-pressure high-speed diesel sprays in the optically dense near-nozzle region. The sub-ns temporal and μm spatial resolution allows us to capture the morphology of the high-speed fuel sprays traveling at 500 m/s with a negligible motion blur. Both quality and quantitative information about the spray feature can be readily obtained. In the experiment, two types of single-hole nozzles have been used, one with a hydroground orifice inlet and the other with a sharp one. Within 3 mm from the nozzle, the sprays from these nozzles behave differently, ranging from laminar flow with surface instability waves to turbulent flow. The sprays are correlated with the nozzle internal geometry, which provides practical information for both nozzle design and supporting numerical simulation models. The nozzle internal structure is also imaged by the x-ray phase-contrast method. The measured nozzle internal geometry was used to predict cavitation inside the orifice through a numerical simulation. The simulation demonstrates that cavitation generated at the sharp inlet is responsible for the cavitating spray from the nozzle

Notes:

Vendor supplied data

Publisher Number:

2010-01-0877

Access Restriction:

Restricted for use by site license