Flow Around and Fluid Forces on a Cross-Shaped Tube

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概要

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• Flow visualization tests and fluid force measurements were conducted in a water tunnel to investigate flow around and fluid forces on a cross-shaped tube (CST) in a cross-flow. The following results were obtained. Flow around a CST is classified into two patterns. One is perfect-separation flow for small incidence angle and the other is reattached flow for large incidence angle. The critical incidence angle where the flow pattern changes from the former to the latter is about 7.5°∼15°. At the critical angle, the mean drag and lift coefficients reach their minimum while the Strouhal number attains to the maximum. The amplitude of the fluctuating lift decreases as the incidence angle increases. These features of flow around and fluid forces on a CST are quite similar to those of a square prism. These results imply that one-degree-of-freedom galloping and vortex-induced vibration possibly occur for small incidence angle while ILEV (impingement of leading edge vortices) vibration might be caused for large incidence angle when a CST is elastically supported in a cross-flow.

• 一般社団法人 日本機械学会の論文

著者

• Eguchi Yuzuru

  Civil Engineering Research Laboratory Central Research Institute Of Electric Power Industry

• Inada Fumio

  Nuclear Technology Research Laboratory Central Research Institute Of Electric Power Industry (criepi

• YASUO Akira

  Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry

• NISHIHARA Takashi

  Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry

関連論文

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• Improvement of Gas Entrainment Prediction Method : Introduction of Surface Tension Effect
• Characteristics of Type-I Density Wave Oscillations in a Natural Circulation BWR at Relatively High Pressure
• Flow Around and Fluid Forces on a Cross-Shaped Tube

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