Influence of the External Disturbances on Natural Boundary-Layer Transition in 2-D Wing Flows

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  • 二次元翼境界層の自然遷移に対する外乱の影響
  • 2ジゲンヨク キョウカイソウ ノ シゼン センイ ニ タイスル ガイラン ノ エイキョウ

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Abstract

A series of experiments have been carried out to investigate influence of free-stream turbulence and acoustic noise on laminar-to-turbulent transition in 2-D wing flow. The quantitative evaluation of the influence on the total growth rate N between neutral point and transition point is required for the transition prediction based on the eN method. Details of natural transition on an identical model were examined in five different wind tunnels. Earlier transition is observed in the wind tunnels with larger acoustic noise and/or larger residual free-stream turbulence. Separate evaluations of free-stream turbulence and sound pressure level lead to an empirical relation between the residual turbulence Tu, the sound pressure level SPL and the total growth rate N as N=-1.32×ln (Tu) -0.003×SPL+6.57 for NACA0015 wing.

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