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首页> 外文期刊>Journal of the American Helicopter Society >An Experimental and Theoretical Study of Blade-Vortex Interaction Noise
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An Experimental and Theoretical Study of Blade-Vortex Interaction Noise

机译：叶片-涡旋相互作用噪声的实验和理论研究

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摘要

An experimental method to study helicopter blade-vortex interaction (BVI) noise has been developed. Called the blade-controlled disturbance interaction, the method nearly replicates a rotor BVI by having a single-bladed rotor pass through a stationary gust field specially designed to simulate the highly impulsive induced velocity field of a vortex. This approach can be used to evaluate the effectiveness of blade design changes to noise radiation during a BVI event, as well as to study the effect of different interaction geometries on the resulting noise. The first set of experiments in this facility s1hows that the directionality of BVI noise radiation is very sensitive to the interaction angle. Oblique interactions spread the acoustics energy over wider azimuth angles compared to parallel interactions, as well as move the peak noise location closer to the rotor plane. Linear two-dimensional unsteady aerodynamic theory predicts the overall directionality trends reasonably well. However, the actual pulse shapes do not match and noise levels are underpredicted, particularly for oblique interactions.
机译：已经开发了一种研究直升机叶片涡旋相互作用（BVI）噪声的实验方法。该方法称为叶片控制的扰动相互作用，该方法通过使单叶片转子经过专门设计来模拟涡流的高脉冲感应速度场的固定阵风场，从而几乎复制了转子BVI。这种方法可用于评估BVI事件期间叶片噪音变化的设计效果，以及研究不同相互作用几何形状对产生的噪声的影响。在该设施中的第一组实验表明，BVI噪声辐射的方向性对相互作用角非常敏感。与平行相互作用相比，倾斜相互作用将声能散布在更宽的方位角上，并使峰值噪声位置更靠近转子平面。线性二维非定常空气动力学理论可以很好地预测整体方向性趋势。但是，实际的脉冲形状不匹配，并且噪声水平低估了，特别是对于倾斜相互作用。

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