軸対称流線形物体後流の不安定性に関する実験的研究(安定性・乱流安定性(1),一般講演)

概要

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The instability of axisymmetric laminar wake behind a body of revolution which consists of NACA symmetric airfoil section is studied experimentally. Magnetic Suspension and Balance Systems (MSBS) are used to support the axisymmetric body to avoid undesirable influences of mechanical supports. It is shown that the wake is convectively unstable in the whole region and the disturbance growth is well predicted by the linear stability theory for the NACA0015 model. For thicker models such as NACA0024 airfoil section, on the other hands, the wake includes an absolutely-unstable region immediately downstream of the trailing edge. However, the absolutely-unstable region is too small to lead to a self sustained wake oscillation even for such thick airfoil cross-section model.
2009-09-02