PIV laboratory
Research keywords:
· PIV
· Computational Fluid Dynamics
· CFD
· Nuclear reactor
· Thermohydraulics
· Particle Image Velocimetry
· Energetics
· Nuclear fuel assembly
Horizon Europe keywords:
· Clean, sustainable, secure and competitive energy supply
Introduction of the Research Group
The BME NTI has at its disposal a PIV (Particle Image Velocimetry) based infrastructure to perform non-intrusive flow velocity measurements in different geometries relevant to the nuclear industry. The principle of PIV measurement is based on the principle that the velocity of a flowing fluid can be determined from the velocity of small particles added to the medium and flowing with it. This requires tracer particles of approximately the same density as the fluid. In practice, polyamide/polystyrene particles with a diameter of a few microns are used for water working fluids. The velocity of the tracer particles is determined by laser velocimetry.The measurement involves using a high-intensity light source (pulsed laser) to briefly illuminate the area under test and a digital camera to record the light scattered by the tracer particles - in effect, photographing the distribution of the particles; the laser is used as a high-intensity light source similar to a camera flash. If two successive laser flashes are used to capture a pair of images, a statistical method can be used to determine the position and displacement of each particle during the time between the two images being captured, so that the instantaneous velocity field of the illuminated area can be determined.The measurement procedure can be used to study fundamental phenomena in simple or even complex geometries, and the measurement results can be used to validate numerical simulation models. photographing the distribution of the particles; the laser is used as a high-intensity light source similar to a camera flash. If two successive laser flashes are used to capture a pair of images, a statistical method can be used to determine the position and displacement of each particle during the time between the two images being captured, so that the instantaneous velocity field of the illuminated area can be determined. The measurement procedure can be used to study fundamental phenomena in simple or even complex geometries, and the measurement results can be used to validate numerical simulation models. photographing the distribution of the particles; the laser is used as a high-intensity light source similar to a camera flash. If two successive laser flashes are used to capture a pair of images, a statistical method can be used to determine the position and displacement of each particle during the time between the two images being captured, so that the instantaneous velocity field of the illuminated area can be determined. The measurement procedure can be used to study fundamental phenomena in simple or even complex geometries, and the measurement results can be used to validate numerical simulation models. a statistical method can be used to determine the position and displacement of each particle during the time between the two images being captured, so that the instantaneous velocity field of the illuminated area can be determined. The measurement procedure can be used to study fundamental phenomena in simple or even complex geometries, and the measurement results can be used to validate numerical simulation models. a statistical method can be used to determine the position and displacement of each particle during the time between the two images being captured, so that the instantaneous velocity field of the illuminated area can be determined. The measurement procedure can be used to study fundamental phenomena in simple or even complex geometries, and the measurement results can be used to validate numerical simulation models.
Watch our 3-minute introductory video:
Achievements
1. Study of natural convection flow using PIV/LIF methodology around a vertical heated rod2. Investigation of the flow field in a PIV model describing the core of a molten salt nuclear reactor
3. Investigation of the flow field in a PIV model describing the fuel assembly of a gas-cooled fast reactor
4. Investigation of the flow field in a PIV model describing the fuel assembly of a VVER-1200 nuclear reactor fast reactor
Future plans:
5. Investigation of the flow field in a PIV model describing the fuel assembly of VVER-440 damaged in a Loss-Of-Coolant Accident (LOCA)
6. Investigation of the heated fuel assembly of a BME training reactor using the PIV method
Publications
1. Study on Natural Convection around a vertical heated rod using PIV/LIF technique, Rita Szijártó, Bogdán Yamaji, Attila Aszódi, 20th Symposium of AER on VVER Reactor Physics and Reactor Safety Hanasaari, 20102. Thermal–hydraulic analyzes and experimental modeling of MSFR, Bogdán Yamaji, Attila Asódi, Máté Kovács, Gyula Csom, Annals of Nuclear Energy, Volume 64, 2014, https://www.sciencedirect.com/science/article/pii/S0306454913004817#!
3. Uncertainty analysis and flow measurements in an experimental mock-up of a molten salt reactor concept, Bogdán Yamaji, Attila Asódi, Kerntechnik Volume 81, 2016
https://www.sciencedirect.com/science/article/pii/S0149197016301615?via %3Dihub
4. Experimental and numerical thermal-hydraulics investigation of a molten salt reactor concept core, Bogdán Yamaji, Attila Aszódi, Kerntechnik Volume 82, 2017
https://www.degruyter.com/document/doi/10.3139/124.110824/html
5. Preliminary Thesis on the First Part of the ALLEGRO CFD Benchmark Exercise: ALLEGRO CFD BENCHMARK: PART 1: Flow Straightener Benchmark Description, Gergely Imre Orosz, Mathias Peireti, Boglárka Magyar, Dániel Szerbák, Dániel Kacz, Béla Kiss, Gábor Zsíros, Attila Aszódi, 2022
https://arxiv.org/abs/2203.03940
6. Allegro Gas Cooled Fast Reactor Rod Bundle Investigations with Cfd and Piv Method, Preprin in Nuclear Engineering and Design 2022, Gergely Imre Orosz, Boglárka Magyar, Dániel Szerbák, Dániel Kacz, Attila Aszódi
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4084730