Application of X-ray micro-computed tomography on high-speed cavitating diesel fuel flows

The flow inside a purpose built enlarged single-orifice nozzle replica is quantified using time-averaged X-ray micro-computed tomography (micro-CT) and high-speed shadowgraphy. Results have been obtained at Reynolds and cavitation numbers similar to those of real-size injectors. Good agreement for t...

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Bibliographic Details
Published in:Experiments in fluids 2016-11, Vol.57 (11), p.1-14, Article 175
Main Authors: Mitroglou, N., Lorenzi, M., Santini, M., Gavaises, M.
Format: Article
Language:English
Subjects:
Cavitation
Cavitation number
Clouds
Computed tomography
Diesel fuels
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid flow
Fluid- and Aerodynamics
Heat and Mass Transfer
High speed
High speed cameras
Nozzles
Orifices
Research Article
Reynolds number
Three dimensional flow
Tomography
Vapor clouds
X-rays
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Summary:The flow inside a purpose built enlarged single-orifice nozzle replica is quantified using time-averaged X-ray micro-computed tomography (micro-CT) and high-speed shadowgraphy. Results have been obtained at Reynolds and cavitation numbers similar to those of real-size injectors. Good agreement for the cavitation extent inside the orifice is found between the micro-CT and the corresponding temporal mean 2D cavitation image, as captured by the high-speed camera. However, the internal 3D structure of the developing cavitation cloud reveals a hollow vapour cloud ring formed at the hole entrance and extending only at the lower part of the hole due to the asymmetric flow entry. Moreover, the cavitation volume fraction exhibits a significant gradient along the orifice volume. The cavitation number and the needle valve lift seem to be the most influential operating parameters, while the Reynolds number seems to have only small effect for the range of values tested. Overall, the study demonstrates that use of micro-CT can be a reliable tool for cavitation in nozzle orifices operating under nominal steady-state conditions.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-016-2256-z