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Novel approach to helicopter brownout based on vortex and discrete element methods

机译：基于涡旋和离散元件的直升机衰退的新方法

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So far, numerical methods used for brownout considered empirical and semi-empirical models, but particle-particle and particle-surface interactions were not extensively researched. In this work, a novel approach to helicopter brownout coupling a vortex method and a discrete element method is developed. In this approach, the dynamics of individual sand particles, the particle-particle and particle-surface interactions are directly computed and coupled with the flow field of a helicopter in ground effect through aerodynamic forces. The method is demonstrated for a scaled rotor of 172 mm diameter in ground effect, as well as for the US Army EH-60L in brownout. The results show that the predicted radial velocity profiles and wall jet compare well with experiments and published CFD results, and the predicted behavior of brownout agrees with observations from flight tests of the EH-60L. Compared with Lagrangian dust cloud simulation, the predicted relative error of dust cloud is reduced by 57.09% in the taxi-pass case and 28.76% in the approach-to-touchdown case. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：到目前为止，用于撤销的数值方法被认为是经验和半经验模型，但颗粒颗粒和颗粒表面相互作用未被广泛研究。在这项工作中，开发了一种新颖的直升机颠簸耦合涡旋方法和离散元件方法的新颖方法。在这种方法中，通过空气动力直接计算单个砂颗粒，粒子 - 粒子和颗粒 - 表面相互作用的动态，并与直升机的流动场上耦合。该方法用于缩放转子的直径为172毫米的地面效果，以及URBout中的美国陆军EH-60L。结果表明，预测的径向速度分布和壁射流与实验相比，并发表了CFD结果，衰退的预测行为与EH-60L的飞行试验同意观察。与拉格朗日粉尘云模拟相比，尘云的预测相对误差减少了57.09％在出租车的情况下减少了57.09％，接近触地阵容案例中的28.76％。 （c）2021 Elsevier Masson SAS。版权所有。

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