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首页> 外文期刊>The Aeronautical Journal >Transitional separation bubbles and unsteady aspects of aerofoil stall
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Transitional separation bubbles and unsteady aspects of aerofoil stall

机译:过渡分离气泡和机翼失速的不稳定方面

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摘要

A time-accurate solution method for the coupled potential flow and integral boundary-layer equations is used to study aerofoils near stall, where laboratory experiments have shown high-amplitude low-frequency oscillations. The laminar-turbulent transition model incorporates an absolute instability formulation, which allows the transition process in separation bubbles to be sustained in the absence of upstream disturbances, in agreement with recent direct numerical simulations. The method is demonstrated to capture large scale flow oscillations with Strouhal numbers and amplitudes comparable to experiments. The success of this particular physical model suggests that bubble bursting is primarily due to a potential-flow/boundary-layer interaction effect, in which relatively simple models of boundary layer transition and turbulence suffice to describe the key phenomena.
机译:耦合势能流和积分边界层方程的时间精确解法用于研究失速附近的翼型,其中实验室实验显示了高振幅低频振荡。层流湍流模型结合了绝对不稳定性公式,与最近的直接数值模拟相一致,该模型允许在没有上游扰动的情况下维持分离气泡中的过渡过程。实践证明,该方法可以捕获斯特鲁哈尔数和幅值可与实验媲美的大规模流动振荡。这种特殊物理模型的成功表明,气泡破裂主要是由于势流/边界层相互作用效应所引起的,在这种效应中,边界层过渡和湍流的相对简单模型足以描述关键现象。

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