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Numerical Simulation of Helicopter Rotor Performance Degradation in Natural Rain Encounter
International Journal of Aerospace Engineering ( IF 1.4 ) Pub Date : 2021-04-29 , DOI: 10.1155/2021/5533823
Guozhi Li 1 , Yihua Cao 2
Affiliation  

Sustained flight operation in the rain conditions is still a challenge to a pilot. This problem can be mainly attributed to the aerodynamic performance degradation of aircraft. In this article, in order to quickly understand the influence of rainfall aiming at the engineering application, an approach to predict helicopter rotor performance degradation in heavy rain encounters is presented. Firstly, we develop a computational fluid dynamics- (CFD-) based method of simulation of the blade airfoil under natural rain scenario and different angles of attack in order to obtain a data-driven basis relating to multiple working conditions of the rotating blades for further analysis. Then, these data are studied using a discretization analysis method of rotor aerodynamics. CFD simulations are conducted, including the case of NACA 0012 airfoil with 10 m chord length, and the case of SC1095 airfoil used in a full-scale rotor of UH-60A helicopter. Prediction of helicopter rotor performance degradation is carried out in a thunderstorm heavy rain with the rain rate of 1500 mm/h using this full-scale rotor. The quantitative results indicate that heavy rain dramatically degrades the rotor performance. The maximum percentage decrease in lift coefficient of this full-scale rotor blade airfoil is reached by 12.75%. The maximum percentage increase in drag coefficient of this full-scale rotor blade airfoil is reached by 26.51%. The maximum percentage decrease in averaging lift-to-drag ratio of this full-scale rotor disk is reached by 26.39%.

中文翻译:

天然雨天遭遇直升机旋翼性能退化的数值模拟。

在雨天条件下持续飞行仍然是飞行员面临的挑战。该问题主要归因于飞机的空气动力性能下降。在本文中,为了快速了解降雨对工程应用的影响,提出了一种预测在大雨天气中直升机旋翼性能下降的方法。首先,我们开发了一种基于计算流体动力学(CFD-)的自然雨天和不同攻角条件下叶片翼型仿真方法,以获得与旋转叶片多种工况有关的数据驱动基础。分析。然后,使用转子空气动力学的离散化分析方法研究这些数据。进行CFD模拟,包括弦长为10 m的NACA 0012机翼的情况,以及UH-60A直升机的全尺寸旋翼中使用的SC1095机翼的情况。使用这种全尺寸旋翼,可在雷暴大雨中以1500 mm / h的降雨速度进行直升机旋翼性能下降的预测。定量结果表明,大雨会严重降低转子性能。该全尺寸转子叶片翼型的升力系数最大降低百分比达到了12.75%。这种全尺寸转子叶片翼型的阻力系数最大增加百分比达到了26.51%。该全尺寸转子盘的平均升/降比的最大降低百分比达到了26.39%。使用这种全尺寸旋翼,可在雷暴大雨中以1500 mm / h的降雨速度进行直升机旋翼性能下降的预测。定量结果表明,大雨会严重降低转子性能。该满量程转子叶片翼型的升力系数最大降低百分比达到了12.75%。这种全尺寸转子叶片翼型的阻力系数最大增加百分比达到了26.51%。该全尺寸转子盘的平均升/降比的最大降低百分比达到了26.39%。使用这种全尺寸旋翼,可在雷暴大雨中以1500 mm / h的降雨速度进行直升机旋翼性能下降的预测。定量结果表明,大雨会严重降低转子性能。该全尺寸转子叶片翼型的升力系数最大降低百分比达到了12.75%。这种全尺寸转子叶片翼型的阻力系数最大增加百分比达到了26.51%。该全尺寸转子盘的平均升/降比的最大降低百分比达到了26.39%。该全尺寸转子叶片翼型的升力系数最大降低百分比达到了12.75%。这种全尺寸转子叶片翼型的阻力系数最大增加百分比达到了26.51%。该全尺寸转子盘的平均升/降比的最大降低百分比达到了26.39%。该全尺寸转子叶片翼型的升力系数最大降低百分比达到了12.75%。这种全尺寸转子叶片翼型的阻力系数最大增加百分比达到了26.51%。该全尺寸转子盘的平均升/降比的最大降低百分比达到了26.39%。
更新日期:2021-04-29
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