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高レイノルズ数域における曲率の強いエルボ内流れのLDV計測

LDV measurements of a flow in a strongly-curved elbow under a high Reynolds number condition

岩本 幸治*; 南浦 弘尚*; 十河 基介*; 山野 秀将   

Iwamoto, Yukiharu*; Minamiura, Hirotaka*; Sogo, Motosuke*; Yamano, Hidemasa

レイノルズ数50000における詳細なLDV計測結果が示される。軸方向流速の周波数分析により、本エルボにおいて2種類の流動変動が示された。せん断流領域においてストロハル数が約1.0の変動が見られ、剥離域及びその下流においてストロハル数が約0.5の変動が得られた。これらの変動はまた流れの可視化によっても観察された。

Detailed results of LDV measurement for Reynolds number of 50000 is shown. Frequency analyses of axial velocities indicate that two kinds of flow fluctuations exist in the present elbow. One is the fluctuation with approximate Strouhal number (based on a pipe inner diameter and a bulk velocity) of 1.0 occurring in a shear flow region. The other is with approximate Strouhal number of 0.5 occurring in the separated and its downstream regions. These fluctuations were also observed by flow visualization.

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