Novel experimental technique for 3D investigation of high-speed cavitating diesel fuel flows by X-ray micro computed tomography

An experimental technique for the estimation of the temporal-averaged vapour volume fraction within high-speed cavitating flow orifices is presented. The scientific instrument is designed to employ X-ray micro computed tomography (microCT) as a quantitative 3D measuring technique applied to custom d...

Full description

Saved in:
Bibliographic Details
Published in:Review of scientific instruments 2017-03, Vol.88 (3), p.033706-033706
Main Authors: Lorenzi, M., Mitroglou, N., Santini, M., Gavaises, M.
Format: Article
Language:English
Subjects:
Angles (geometry)
Attenuation coefficients
Cavitation
Computation
Computed tomography
Customization
Diesel fuels
Electromagnetic radiation
High speed
Image reconstruction
Incident radiation
Multiphase flow
Nozzles
Orifices
Polyether ether ketones
Position measurement
Scientific apparatus & instruments
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An experimental technique for the estimation of the temporal-averaged vapour volume fraction within high-speed cavitating flow orifices is presented. The scientific instrument is designed to employ X-ray micro computed tomography (microCT) as a quantitative 3D measuring technique applied to custom designed, large-scale, orifice-type flow channels made from Polyether-ether-ketone (PEEK). The attenuation of the ionising electromagnetic radiation by the fluid under examination depends on its local density; the transmitted radiation through the cavitation volume is compared to the incident radiation, and combination of radiographies from sufficient number of angles leads to the reconstruction of attenuation coefficients versus the spatial position. This results to a 3D volume fraction distribution measurement of the developing multiphase flow. The experimental results obtained are compared against the high speed shadowgraph visualisation images obtained in an optically transparent nozzle with identical injection geometry; comparison between the temporal mean image and the microCT reconstruction shows excellent agreement. At the same time, the real 3D internal channel geometry (possibly eroded) has been measured and compared to the nominal manufacturing CAD drawing of the test nozzle.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4978795