Laser Doppler measurement and CFD validation in 3 × 3 bundle flow.pdf

Nuclear Engineering and Design 270 (2014) 396–403 Contents lists available at ScienceDirect Nuclear Engineering and Design j o u r n a l h o m e p ag e : w w w. elsev /locate/nucengdes Laser Doppler measurement and CFD validation in 3 ×3 bundle flow Jinbiao Xiong a,∗ , Yang Yu a , Nan Yu b , Xiaoliang Fu b , Hongyan Wang a , Xu Cheng c , Yanhua Yang a,b a School of Nuclear Science and Engineering, Shanghai Jiao Tong University, China b State Nuclear Power Software Development Center, National Energy Key Laboratory of Nuclear Power Software, China c Karlsruhe Institute of Technology, Germany h i g h l i g h t s • Five-beam LDV is operated in the three-beam mode to measure 3 ×3 bundle flow. • Correlation and FFT techniques are applied to analyze the flow structure. • Large coherent structure is observed in gaps between different subchannels. • The Reynolds stress models predict weak mixing between different subchannels. a r t i c l e i n f o a b s t r a c t Article history: The five-beam three-component laser Doppler system is operated in the three-beam two-component Received 26 November 2013 mode to measure the 3 ×3 bundle flow with simple grid spacer. Experiment has been conducted at Received in revised form 8 February 2014 Re = 15,200 and 29,900. According to the experiment result, the root mean square (RMS) of axial velocity Accepted 10 February 2014 fluctuation shows large value in the gap and the near-wall region of the edge sub-channel which is induc