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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers >A conceptual method to assess ship-helicopter dynamic interface
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A conceptual method to assess ship-helicopter dynamic interface

机译：一种评估船用直升机动态界面的概念方法

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The combined operation of a ship and a helicopter is ubiquitous in every naval organization. The operation of a ship in combination with the landing and take-off operations of a helicopter results in a very complex flow phenomenon. This is due to the presence of ship airwakes, strong velocity gradients and widely varying turbulence length scales. An accurate assessment of the resultant flow phenomena is an outstanding challenge for naval architects as well as researchers. A conceptual method to gain insight into the combined ship-helo flow phenomena over a helodeck is presented. The prime objective of this work is to develop an economical design tool employing both experimental as well as computational techniques to simulate the ship-helicopter coupled environment regime at early design stages reasonably well so as to ease the burden of expensive and risky sea trials. For this purpose, a simplified dynamic interface (SDI) model is proposed to investigate the coupled effects of ship airwake and helicopter rotor downwash. The paper reports a parametric analysis to study the coupled ship-helo airwake behaviour and its impact on helicopter fuselage over the ship helodeck for different ship speed regimes by the proposed SDI model. Further, an attempt has been made to set up preliminary design criteria to grade the ship-helicopter interface for ensuring minimum standards of safe helo operations. Finally, we discuss the impact of the coupled flow dynamics in terms of induced fuselage drag, cross-flow characteristics, rotor plane wake and velocity gradients existing over the helodeck region and evaluate the proposed design criteria.
机译：在每个海军组织中，船舶和直升机的联合操作无处不在。船舶的操作与直升机的着陆和起飞操作相结合会导致非常复杂的流动现象。这是由于存在船舶空中尾流，强劲的速度梯度和湍流长度尺度的广泛变化。对于由此产生的流动现象进行准确的评估，对于海军建筑师和研究人员而言都是一个巨大的挑战。提出了一种概念方法，可深入了解直升机甲板上的组合船-Helo流现象。这项工作的主要目的是开发一种经济的设计工具，该工具同时采用实验和计算技术来合理地模拟早期设计阶段的船-直升机耦合环境状况，从而减轻昂贵且冒险的海上试验的负担。为此，提出了一种简化的动态接口（SDI）模型来研究船舶空中苏醒和直升机旋翼下冲的耦合效应。本文报告了一个参数分析，以通过拟议的SDI模型研究不同的航速情况下的耦合的船-直升机空中唤醒行为及其对直升机直升机在机身甲板上的影响。此外，已经尝试建立初步设计标准来对船用直升机界面进行分级，以确保安全直升机操作的最低标准。最后，我们讨论了耦合流动动力学对机身阻力，横流特性，旋翼飞机尾流和直升机甲板区域上存在的速度梯度的影响，并评估了提出的设计标准。

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