City Research Online

High-speed X-Ray Phase-Contrast Imaging of String Cavitation in an Enlarged Diesel-Injector Orifice Replica

Karathanassis, I. K. ORCID: 0000-0001-9025-2866, Koukouvinis, P. ORCID: 0000-0002-3945-3707, Lorenzi, M., Kontolatis, E., Li, Z., Wang, J., Mitroglou, N. and Gavaises, M. ORCID: 0000-0003-0874-8534 (2017). High-speed X-Ray Phase-Contrast Imaging of String Cavitation in an Enlarged Diesel-Injector Orifice Replica. Paper presented at the ILASS–Europe 2017, 28th Conference on Liquid Atomization and Spray Systems, 6 - 8 September 2017, 6 - 8 September 2017 Valencia, Spain.

Abstract

The present investigation illustrates the temporally-resolved, phase-contrast visualization of the cavitating flowwithin an enlarged injector replica conducted at the ANL Advanced Photon Source. The flow was captured through side-view, x-ray radiographies at 67890 frames per second with an exposure time of 347ns. The orifice employed for the experiments has an internal diameter of 1.5mm and length equal to 5mm. A parametric investigation was conducted considering various combinations of the Reynolds and cavitation numbers, which designate the extent of in-nozzle cavitation. Proper post-processing of the obtained radiographies enabled the extraction of information regarding the shape and dynamical behaviour of cavitating strings. The average string extent along with its standard deviation was calculated for the entire range of conditions examined (Re=18000-36000, CN=1.6-7.7). Furthermore, the effect of the prevailing flow conditions on quantities indicative of the string dynamic behaviour such as the break-up frequency and lifetime was characterized and the local velocity field in the string region was obtained.

Publication Type: Conference or Workshop Item (Paper)
Additional Information: This work is licensed under a Creative Commons 4.0 International License(CC BY-NC-ND 4.0).
Publisher Keywords: Fuel injection; synchrotron radiation; nozzle flow; high-speed radiography; velocimetry
Subjects: T Technology > TJ Mechanical engineering and machinery
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
URI: http://openaccess.city.ac.uk/id/eprint/21972
[img]
Preview
Text - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (1MB) | Preview

Export

Downloads

Downloads per month over past year

View more statistics

Actions (login required)

Admin Login Admin Login