The Effect of Lift Position on Helicopter Recovery to a Twin-Island Aircraft Carrier
The Effect of Lift Position on Helicopter Recovery to a Twin-Island Aircraft Carrier
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DOI：
10.4050/f-0078-2022-17585
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
N. Watson;R. Lynn;I. Owen;M. White
中科院分区：
文献类型：
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作者：
N. Watson;R. Lynn;I. Owen;M. White
本文研究了双岛航空母舰在升降机升降状态下飞行甲板上的气流，以及直升机悬停在甲板上时所受气动载荷的变化。使用计算流体动力学模拟了右舷60 °处40 kt风下飞行甲板上的非定常流。分析比较了不同升力布局下驾驶舱内湍流强度和速度场的变化规律。本文对1：200缩尺的航空母舰模型在大型循环水槽中进行了升力升降时的平均流场和非定常流场的实验研究。对全尺寸航空母舰的流场进行了CFD预测，并与实验速度数据进行了比较。为了分析两种尾流对悬停直升机的影响，采用了一种称为虚拟AirDyn的技术来量化作用在飞机上的非定常力和力矩。每种升力配置的30秒时变速度模拟数据与一架代表"海鹰“SH-60 B直升机的飞行动力学模型相结合。直升机被固定在飞行甲板上的悬停位置，并受到每个不稳定的空气尾流。分析了悬停状态下升力位置对直升机的非定常气动载荷的影响。结果表明，在所考虑的条件下，虽然升力的位置确实会影响气流和气动载荷，但对回收直升机的影响是有限的。
This paper describes an investigation of the air flow over the flight deck of a twin-island aircraft carrier with the ship's lifts in a raised and lowered position, and the subsequent change in the aerodynamic loads on a helicopter in hover over the deck. The unsteady flow over the flight deck was simulated using Computational Fluid Dynamics for a 40 kt wind from 60◦ off the starboard. The turbulence intensity and velocity flow field produced over the flight deck for each lift configuration was analyzed and compared. An experimental study was conducted in which the mean and unsteady f low over a 1:200 scale model the aircraft carrier submerged in a large recirculating water channel was measured with the lifts in the raised and lowered position. The CFD prediction of the flow over the full-scale aircraft carrier was compared to the experimental velocity data. To analyze the effect of the two airwakes on a helicopter in hover, a technique known as the Virtual AirDyn was used to quantify the unsteady forces and moments acting on the aircraft. Thirty seconds of time-varying velocity data simulated for each lift configuration was integrated with a flight dynamics model of a helicopter representative of a Seahawk SH-60B. The helicopter was fixed in hover positions over the flight deck and subjected to each unsteady airwake. The resultant unsteady aerodynamic loads acting on the aircraft were analyzed to assess the effect of the lift positions on the helicopter in hover. The results show that for the conditions considered, while the lifts' positions do affect the air flow and the aerodynamic loading, there will only be a limited impact on a recovering helicopter.