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Research Papers: Nuclear Power

Measurement of Wavy Surface Oscillations on Liquid Metal Lithium Jet for IFMIF Target

[+] Author and Article Information
Hirokazu Sugiura, Sachiko Yoshihashi-Suzuki, Nobuo Yamaoka, Hiroshi Horiike

Graduate School of Engineering, Osaka University, Yamada-oka 2-1, Suita, Osaka 565-0871, Japan

Takuji Kanemura, Hiroo Kondo, Mizuho Ida, Hiroo Nakamura

 Japan Atomic Energy Agency, 2-1 Shirakata Shirane, Tokai Mura, Ibaraki 319-1195, Japan

Tomohide Yoshikawa

 Chugoku Electric Power Co., Inc., 654-1 Kataku Kashima-tyo, Matue City 690-0393, Japan

Izuru Matsushita

 Shinryo High Technologies Ltd., 4-22, Wadamiya-dori 5, Hyogoku, Kobe, Hyogo 652-0863, Japan

J. Eng. Gas Turbines Power 133(5), 052911 (Dec 16, 2010) (6 pages) doi:10.1115/1.4002867 History: Received July 08, 2010; Revised August 03, 2010; Published December 16, 2010; Online December 16, 2010

The International Fusion Materials Irradiation Facility (IFMIF) has been conceived as a high-flux 14 MeV neutron source for testing candidate fusion reactor materials. In the current design, neutrons are generated by irradiating a target with a deuteron beam and high-speed free-surface flow of liquid metal lithium (Li) is adopted as the target. To reveal the stability of the Li flow, we have examined characteristics of surface waves at a location 175 nm downstream from a nozzle exit, which corresponds to the center of the beam irradiated region. In this study, the characteristics of surface waves just downstream of the nozzle exit were measured experimentally, since the initial growth of surface waves exerts a definite influence on the surface behavior of the Li flow in the downstream region. Experiments were carried out with a focus on surface oscillations of the Li flow using the lithium circulation loop at Osaka University. These oscillations are measured using an electro-contact probe apparatus, which can detect electrically a contact between the probe tip and the Li surface and provide local height data of surface waves. The apparatus was installed at a location 15 mm downstream from the nozzle exit and scanned the Li surface by moving along the liquid-depth direction. The experiments were performed for the velocity range of 3-15 m/s under argon gas atmosphere at a pressure of 0.13 MPa. The contact signal recorded in the experiment was used to analyze the characteristics of surface waves, and then the root-mean-square wave amplitude and the frequency of surface waves were calculated. It was found that the root-mean-square wave amplitudes of surface waves increased with a rise in the flow velocity, and reached approximately 0.18 mm at 14-15 m/s. And also, obtained frequencies were analyzed using a linear stability theory, and the variation of frequencies was examined with the mean flow velocity.

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Figures

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Figure 1

Schematic view of liquid Li circulation facility

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Figure 2

Cross-sectional view of free-surface test section

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Figure 3

Photographs of electrocontact probe apparatus. Upper: overall view. Lower: enlarged view of the head.

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Figure 4

Installation position of probe apparatus in the second viewing port

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Figure 5

Contact frequency

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Figure 6

Illustration of contact frequency

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Figure 7

Histograms of wave amplitude: (a) number of waves per second at 6 m/s with 0.02 mm step and (b) number of waves per second at 12 m/s with 0.03 mm step

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Figure 8

rms wave amplitudes versus flow velocity

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Figure 9

Schematic illustration of contact signals and contact between a probe and surface waves

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Figure 10

Probability density versus frequency: (a) case of 3 m/s, (b) case of 6 m/s, (c) case of 9 m/s, and (d) case of 13 m/s

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Figure 11

Comparison between peak frequencies of surface waves and the most amplified frequency f0 (solid line)

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