1503 乱流境界層の相似則に及ぼす圧力勾配の影響

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  • 1503 Pressure Gradient Effects on the Similarity Law of Turbulent Boundary Layers

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Detailed experiments have been made for effect of the adverse and favorable pressure gradients on the low of the wall in turbulent boundary layers. The local wall shear stress was measured by a direct measurement device. Mean and turbulent velocity profiles were measured by hot wire anemometer. A new velocity scale defined by considering significant contribution of inertia term in integrating the equations of motion was applied to the near wall statistical properties. The log-law modified with the new velocity scale agrees well with experimental data. The streamwise turbulent intensity profile in the wall layer is likely to be scaled successfully with the new velocity scale.

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