B344 共鳴条件を満たす温度擾乱による内部重力波の制御

概要

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Control of internal gravity wave was experimentally investigated in a strongly stable mixing layer generated in a testsection of a low turbulent wind tunnel. Small thermal disturbances with three frequency components were given to enhance internal gravity waves by a fine heating wire at the position of the maximum local temperature gradient in the upstream settling chamber. When thermally excited, energy density levels of temperature fluctuations were increased and nonlinear interaction among the three waves was apparently stimulated in the downstream mixing layer. Wavelet analysis showed that such enhancement effects were brought about by the increase in amplitude of the waves and the improvement in stationarity of their constituent frequencies. Phase difference between vertical component of velocity fluctuation and temperature fluctuation approached -π/2 ∿ 0,and then, counter-gradient heat flux was generated in the excited mixing layer as the constituent waves became broken down.
日本流体力学会の論文
2000-07-25