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首页> 外文会议>Operating helicopters safely in a degraded visual environment: how can helicopters operate safely in dayight and adverse atmospheric conditions >Helicopter Brownout - Can it be Modelled?
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Helicopter Brownout - Can it be Modelled?

机译：直升机停电-可以建模吗？

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Significant progress has been made to date in modelling, computationally, the formation and developmentrnof the dust cloud that forms in the air surrounding the rotorcraft under brownout conditions. Modernrncomputational methods are able to replicate not only the development of the dust cloud in appropriaternoperational scenarios, but also the sensitivity of the shape and density of the dust cloud to the detailed de-rnsign of the rotorcraft. Results so far suggest that attempts to ameliorate brownout by aerodynamic means,rnfor instance by modifying the rotor properties, will be frustrated to some extent by the inherent instabilityrnof the °ow ˉeld that is produced by the helicopter. Nonetheless, very recent advances in understandingrnthe fundamental mechanisms that lead to the formation of the dust cloud may allow substantial progressrnto be made once certain elements of the basic physics of the problem are more fully understood and betterrnquantified.
机译：迄今为止，在节电条件下，在旋翼航空器周围空气中形成的尘云的建模和计算方面，已经取得了重大进展。现代的计算方法不仅能够在适当的操作场景下复制尘埃云的发展，而且能够复制尘埃云的形状和密度对旋翼飞机的详细设计的敏感性。迄今为止的结果表明，通过空气动力学手段（例如通过修改旋翼特性）来改善电力不足的尝试，在一定程度上会因直升机产生的流场固有的不稳定性而受挫。但是，一旦对问题基本物理的某些要素得到了更充分的理解和更好的量化，在导致尘埃云形成的基本机理的理解上的最新进展便可以取得实质性进展。

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