Proper orthogonal decomposition analysis of parallel twin jets measured using Particle Image Velocimetry

Saya Lee, Yassin A. Hassan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The mixing of turbulent jets has been found in several locations of High Temperature Gas-cooled Reactors (HTGRs) including upper and lower plenums, where jets impinge into open space from coolant channels. In the present work, a parallel twin jets experimental facility was used to generate velocity field of mixing jets by means of Particle Image Velocimetry (PIV), which can be eventually used for validation of Computational Fluid Dynamics (CFD) simulations. The facility has two fixed parallel rectangular jet nozzles (5.8mm in width, 87.8mm in length) submerged in the middle of the water tank, which allows an assumption of free jet mixing. In order to compare the experimental data produced to existing data, Re = 4000 ∼ 5000 at the jet outlet was selected. In the past, several statistically meaningful data have been reported using Laser Doppler Velocimetry (LDV) and Hot Wire Anemometer (HWA), which can support Reynolds Averaged Navier-Stokes turbulent models. However, recent CFD simulations using Large Eddy Simulation (LES) require high resolution experimental data in time and space. Thus, in this study, in addition to statistically enough number of data sets for RANS models validation, high temporal and spatial resolution data were collected for the validation of LES calculations. In order to study the turbulent structure Reynolds decomposition and Proper Orthogonal Decomposition (POD) were applied to the data obtained. These decomposition analyses visualized multi-scale vortices and the transportation of eddies. In terms of twin jets structure, the present experimental data showed good agreement with other techniques for the important characteristic parameters including the length of the converging region and the location of the merging point.

Original languageEnglish (US)
Title of host publicationInternational Topical Meeting on High Temperature Reactor Technology, HTR 2016
PublisherAmerican Nuclear Society
Pages172-179
Number of pages8
ISBN (Electronic)9780894487323
StatePublished - 2016
Event8th International Topical Meeting on High Temperature Reactor Technology, HTR 2016 - Las Vegas, United States
Duration: Nov 6 2016Nov 10 2016

Publication series

NameInternational Topical Meeting on High Temperature Reactor Technology, HTR 2016

Conference

Conference8th International Topical Meeting on High Temperature Reactor Technology, HTR 2016
CountryUnited States
CityLas Vegas
Period11/6/1611/10/16

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Energy Engineering and Power Technology

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