High-speed X-Ray Phase Contrast Imaging of String Cavitation in a Diesel Injector Orifice
| Autor: | Manolis Gavaises, Jin Wang, I.K. Karathanassis, Phoevos Koukouvinis, Massimo Lorenzi, Zhilong Li, Nicholas Mitroglou, Efstathios Kontolatis |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
High-speed radiography Synchrotron radiation 020209 energy Replica Flow (psychology) Velocimetry Advanced Photon Source 02 engineering and technology Injector Mechanics 01 natural sciences 010305 fluids & plasmas law.invention Full injection law Cavitation 0103 physical sciences 0202 electrical engineering electronic engineering information engineering C++ string handling Nozzle flow Body orifice |
| Zdroj: | Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.4995/ILASS2017.2017.4996 |
| Popis: | [EN] The present investigation illustrates the temporally-resolved, phase-contrast visualization of the cavitating flow within 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 breakup frequency and lifetime was characterized and the local velocity field in the string region was obtained. The research leading to these results has received funding from the MSCA-ITN-ETN of the EU H2020 programme, under REA grant agreement n. 642536. This research used resources of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) by Argonne National Laboratory under Contract No. 53697. |
| Databáze: | OpenAIRE |
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