漂浮直升机在水域甩尾后的浮力数值分析

Eduardo Tadashi Katsuno, Andreas Peters, O. el Moctar
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引用次数: 0

摘要

本文研究了直升机在水中紧急着陆后的适航行为,重点关注北海北部的波浪气候,并考虑了现实中直升机的几何形状。利用计算流体动力学(CFD)技术,包括以单元为中心的有限体积法和边界元法(BEM),对运动响应和载荷分布进行了分析。该研究通过最佳模拟实践确保数值结果的可靠性。结果表明,在滚动、俯仰和翻滚运动的衰减试验中,无粘性模型与粘性模型产生了相似的结果。获得了滚动、俯仰和翻滚运动的自然周期。在规则波浪条件下,入射波振幅与俯仰/翻滚响应之间呈线性关系,而在小角度条件下,滚动线性关系受到限制。在不规则波浪条件下,直升机倾向于随着时间的推移垂直于波浪,从而导致滚转角度峰值随着显著波浪高度的增加而增大。在不同的显著波浪高度下,最大滚动峰值的超标率被量化,这对评估倾覆概率非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical Seakeeping Analysis for a Floating Helicopter after Ditching in Waters
This paper investigates the seakeeping behavior of helicopters after an emergency landing in water, focusing on a Northern North Sea wave climate and considering a realistic helicopter geometry. Computational Fluid Dynamics (CFD) techniques, including the cell-centered Finite Volume Method and Boundary Element Methods (BEM), were utilized to analyze motion responses and load distribution. The study ensures numerical result reliability through best simulation practices. Results indicate that the inviscid model produces similar outcomes to the viscous model in decay tests with roll, pitch, and heave motions. Natural periods for roll, pitch, and heave motions were obtained. Linearity between incident wave amplitude and pitch/heave response was noted for regular waves, while roll linearity was limited for small angles. In irregular wave conditions, helicopters tended to align perpendicular to waves over time, resulting in increased peak roll angles with higher significant wave heights. Exceedance rates of maximum roll peaks, useful for the assessment of capsizing probability, were quantified for different significant wave heights.
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