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Research Papers: Flows in Complex Systems

Pressure Fluctuation Characteristics of Complex Turbulent Flow in a Single Elbow With Small Curvature Radius for a Sodium-Cooled Fast Reactor

[+] Author and Article Information
Shinji Ebara1

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aramaki-aza aoba, Aoba-ku, Sendai, 980-8579, Japanshinji.ebara@qse.tohoku.ac.jp

Yuta Aoya

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aramaki-aza aoba, Aoba-ku, Sendai, 980-8579, Japanyao@karma.qse.tohoku.ac.jp

Tsukasa Sato

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aramaki-aza aoba, Aoba-ku, Sendai, 980-8579, Japantssato@karma.qse.tohoku.ac.jp

Hidetoshi Hashizume

Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University, 6-6-01-2, Aramaki-aza aoba, Aoba-ku, Sendai, 980-8579, Japanhidetoshi.hashizume@qse.tohoku.ac.jp

Yuki Kazuhisa

Department of Mechanical Engineering, Faculty of Engineering, Tokyo University of Science, Yamaguchi, 1-1-1, Daigaku-dori, Sanyo-Onoda, Yamaguchi, 756-0884, Japankyuki@ed.yama.tus.ac.jp

Kosuke Aizawa

Advanced Nuclear SystemResearch and Development Directorate, Japan Atomic Energy Engineering, 4002 Narito-cho, Oarai, Ibaraki, 311-1393, Japanaizawa.kosuke@jaea.go.jp

Hidemasa Yamano

Advanced Nuclear SystemResearch and Development Directorate, Japan Atomic Energy Engineering, 4002 Narito-cho, Oarai, Ibaraki, 311-1393, Japanyamano.hidemasa@jaea.go.jp

1

Corresponding author.

J. Fluids Eng 132(11), 111102 (Nov 18, 2010) (7 pages) doi:10.1115/1.4002813 History: Received May 27, 2010; Revised September 18, 2010; Published November 18, 2010; Online November 18, 2010

A multi-elbow piping system is adopted for the Japan sodium-cooled fast reactor (JSFR) cold-legs. Flow-induced vibration (FIV) is considered to appear due to complex turbulent flow with very high Reynolds number in the piping. In this study, pressure measurement for a single elbow flow is conducted to elucidate pressure fluctuation characteristics originated from turbulent motion in the elbow, which lead potentially to the FIV. Two different scale models, 1/7- and 1/14-scale simulating the JSFR cold-leg piping, are tested experimentally to confirm whether a scale effect in pressure fluctuation characteristics exists. A distinguishing peak can be seen in each power spectrum density (PSD) profile of pressure fluctuation obtained in and downstream of the flow separation region for both scaled models. When nondimensionalized, the PSD profiles show good correspondence regardless of scale model and even of Reynolds number simulated in this study.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Diagram of 1/7-scale experimental loop

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Figure 2

Diagram of 1/14-scale experimental loop

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Figure 3

Photo of 1/7-scale test section

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Figure 4

Photo of 1/14-scale test section

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Figure 5

How to install sensor

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Figure 6

Influence of the socket length

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Figure 7

Locations of pressure measurement sensors

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Figure 8

Total pressure loss coefficient for the present experimental condition

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Figure 9

Signals from sensors in time series

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Figure 10

Time histories of pressure fluctuation in the case of the 1/7-scale at Re=1.0×106

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Figure 11

PSD profiles of pressure fluctuation in the case of the 1/7-scale at Re=3.2×105

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Figure 12

PSD profiles obtained from various location after subtracting background in the case of the 1/7-scale at Re=3.2×105

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Figure 13

PSD profiles at 0D inside 30 deg obtained from various Re numbers after subtracting background in the case of the 1/7-scale

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Figure 14

Dimensionless PSDs in and downstream of the flow separation region

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