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Research Papers: Fluid-Structure Interaction

Study on In-Flow Fluidelastic Instability of Triangular Tube Arrays Subjected to Air Cross Flow

[+] Author and Article Information
Tomomichi Nakamura

Department of Mechanical Engineering,
Osaka Sangyo University,
3-1-1 Daito,
Osaka 574-8530, Japan
e-mail: t-nak@mech.osaka-sandai.ac.jp

Yoshiaki Fujita, Takuya Sumitani

Department of Mechanical Engineering,
Osaka Sangyo University,
3-1-1 Daito,
Osaka 574-8530, Japan

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 30, 2013; final manuscript received April 10, 2014; published online August 19, 2014. Assoc. Editor: Samir Ziada.

J. Pressure Vessel Technol 136(5), 051302 (Aug 19, 2014) (7 pages) Paper No: PVT-13-1175; doi: 10.1115/1.4027618 History: Received September 30, 2013; Revised April 10, 2014

The in-flow instability of cylinder arrays corresponds to the in-plane instability of U-bend tubes in steam generators. This rarely occurring phenomenon has recently been observed in a nuclear power plant in the U.S. For this reason, the importance of studying this instability has recently increased. The fluidelastic instability of a cylinder array caused by cross-flow was found to easily occur in air-flow and hardly in water-flow in our previous report. The present report introduces the results of this phenomenon in several patterns of triangular cylinder arrays in air-flow. The pitch spacing between cylinders is one of the parameters, which varies from P/D = 1.2 to 1.5, for a five-by-five cylinder array. The instability is examined both in the in-flow direction and in the transverse direction. The test cylinders are supported with thin plates to move in one direction. The number and the location of the flexibly supported cylinders are the other parameters. Differences between the instability in the in-flow and in the transverse direction are found. Among these differences the most important is the fact that the fluidelastic instability has not been observed for a single flexible cylinder in the in-flow direction, although it is observed in the transverse direction. However, the present preliminary results suggest that the in-flow instability may be estimated with the Connors' type formula as likely as in the transverse direction case.

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Figures

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Fig. 1

Test equipment (a) test facilities and (b) image of measurement cylinder

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Fig. 2

Basic cylinder array; instrumented cylinders are labeled 1–9

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Fig. 3

Pattern of flexible cylinders (a) seven flexible cylinder cluster (flexible cluster) and (b) column of flexible cylinders (flexible column)

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Fig. 4

Vibration response of cylinders in the flexible array (P/D = 1.5)

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Fig. 5

Vibration response of cylinders in the flexible cluster configuration (P/D = 1.5)

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Fig. 6

Vibration response of cylinders for the flexible column configuration (P/D = 1.5)

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Fig. 7

Vibration response of single flexible cylinder in transverse direction (P/D = 1.5)

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Fig. 8

Vibration response of cylinders in fully flexible array (P/D = 1.4)

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Fig. 9

Vibration response of cylinders in flexible column (P/D = 1.4)

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Fig. 10

Vibration response of single flexible cylinder (P/D = 1.4)

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Fig. 11

Vibration response of cylinders in flexible array (P/D = 1.3)

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Fig. 12

Vibration response of cylinders in flexible column (P/D = 1.3)

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Fig. 13

Vibration response of single flexible cylinder (P/D = 1.3)

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Fig. 14

Vibration response of cylinders in the flexible array (P/D = 1.2)

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Fig. 15

Vibration response of cylinders in flexible cluster (P/D = 1.2)

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Fig. 16

Vibration response of cylinders in the flexible column configuration (P/D = 1.2)

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Fig. 17

Vibration response of single flexible cylinder (P/D = 1.2)

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Fig. 19

Effect of pitch ratio P/D (all flexible)

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Fig. 20

Effect of flexible cylinder (a) inflow direction and (b) transverse direction

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Fig. 21

Image of flow path between cylinders

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