Experimental investigation of turbulent flow through spacer grids in fuel rod bundles
2009 (English)In: Nuclear Engineering and Design, ISSN 0029-5493, E-ISSN 1872-759X, Vol. 239, no 10, 2013-2021 p.Article in journal (Refereed) Published
This paper contains experimental data of pressure, velocity and turbulence intensity in a 24‐rod fuel bundle withspacer grids. Detailed pressure measurements inside the spacer grid have been obtained by use of a sliding pressuresensingrod. Laser Doppler Velocimetry technique was used to measure the local axial velocity and its fluctuatingcomponent upstream and downstream of the spacer grid in subchannels with different blockage ratios. Themeasurements show a changing pattern in function of radial position in the cross‐section of the fuel bundle. Forsubchannels close to the box wall, the turbulence intensity suddenly increases just downstream of the spacer andthen gradually decays. In inner subchannels, however, the turbulence intensity downstream of the spacer decreasesbelow its upstream value and then gradually increases until it reaches the maximum value at approximately twospacer heights. The present study reveals that spacer effects, such as local pressure distribution and turbulenceintensity enhancement, do not depend exclusively on the local geometry details, but also on the location in thecross‐section of the rod bundle.
Place, publisher, year, edition, pages
2009. Vol. 239, no 10, 2013-2021 p.
Axial velocity, Blockage ratio, Experimental data, Experimental investigations, Fluctuating components, Fuel bundle, Fuel rods, Laser Doppler Velocimetry, Local geometry, Maximum values, Radial position, Rod bundles, Sliding pressure, Spacer effects, Spacer grid, Subchannels, Turbulence intensity
IdentifiersURN: urn:nbn:se:kth:diva-9906DOI: 10.1016/j.nucengdes.2009.05.029ISI: 000270411500032ScopusID: 2-s2.0-68449099150OAI: oai:DiVA.org:kth-9906DiVA: diva2:158039
QC 20101007. Uppdaterad från Submitted till Published (20101007).2009-02-182009-01-292012-12-07Bibliographically approved