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首页> 外文期刊>Journal of the American Helicopter Society >A Method for Predicting the Noise of a Tip-Jet Driven Rotor
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A Method for Predicting the Noise of a Tip-Jet Driven Rotor

机译:顶喷驱动转子的噪声预测方法

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摘要

The use of tip-jets to provide the torque to power rotor blades has long been considered as an alternate approach to a shaft-driven rotor system. However, large tip-jet exit velocities are needed to provide sufficient jet thrust to power the rotor; hence, these jets can generate very large noise levels when compared to the usual sources of rotating blade noise. This paper demonstrates a new approach to predict the noise from such a design. The prediction method uses a derivative of the SAE ARP876 (Revision D) code to compute the tip-jet noise and PSU-WOPWOP to compute the rotational noise. Noise predictions for the Fairey Rotodyne aircraft are compared with acoustic measurements to provide a limited validation of the noise prediction method. The prediction method is also demonstrated through a brief investigation of design constraints and their impact on the rotor noise levels.
机译:长期以来,人们一直认为使用尖端喷嘴向转子叶片提供扭矩的方法是轴驱动转子系统的替代方法。然而,需要大的尖端喷射出口速度以提供足够的喷射推力来为转子提供动力。因此,与通常的旋转叶片噪声源相比,这些射流会产生非常大的噪声水平。本文演示了一种预测这种设计噪声的新方法。该预测方法使用SAE ARP876(修订版D)代码的导数来计算喷尖噪声,并使用PSU-WOPWOP来计算旋转噪声。将Fairey Rotodyne飞机的噪声预测与声学测量值进行比较,以对噪声预测方法进行有限的验证。通过对设计约束及其对转子噪声水平的影响的简要调查,也证明了该预测方法。

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