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首页> 外文期刊>Journal of the American Helicopter Society >Role of Filament Strain in the Free-Vortex Modeling of Rotor Wakes
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Role of Filament Strain in the Free-Vortex Modeling of Rotor Wakes

机译：细丝应变在转子尾流自由涡模型中的作用

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摘要

The problem of straining of vorticity is discussed within the context of time-marching, free-vortex filament modeling of rotor wakes. It is shown that for many practical rotor flight conditions, wake distortions create velocity fields that impose significant three-dimensional strain on the vortex filaments, stretching the filaments and so changing their vorticity and induced velocity field. The approach developed to model these effects applies a Prandtl-type decomposition of advection, strain, and viscous terms into successive sub-processes, with a recombinant solution to give a consistent level of approximation to the rotor wake problem. A model based on an equivalent diffusion time is developed to account for and couple the effects of filament strain into the diffusion model. Validation of the model is conducted. It is shown that strain terms in the rotor wake can be significant, and a proper representation of these effects can have important effects on the rotor wake developments and the spatial locations of blade/vortex interactions over the rotor disk. Examples documenting the significance of strain effects are shown for rotors in forward flight, during descending flight, and in ground effect.
机译：在转子尾流的时间行进，自由涡流细丝建模的背景下讨论了涡旋应变的问题。结果表明，在许多实际的旋翼飞行条件下，尾流畸变会产生速度场，该速度场会在旋流细丝上施加明显的三维应变，拉伸细丝，从而改变其涡度和感应速度场。为模拟这些影响而开发的方法将平流，应变和粘性项的Prandtl型分解应用到连续的子过程中，并采用了重组解决方案以使转子尾流问题的近似水平保持一致。建立了基于等效扩散时间的模型，以将细丝应变的影响考虑在内并将其耦合到扩散模型中。进行模型验证。结果表明，转子尾流中的应变项可能很重要，并且这些影响的正确表示可能会对转子尾流的发展以及转子盘上叶片/涡流相互作用的空间位置产生重要影响。举例说明了在前向飞行，下降飞行和地面效应中转子的应变效应的重要性。

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