This paper is dedicated to the analysis of the broadband noise of an innovative mini-remotely piloted aircraft propeller geometry with straight or serrated edges. New analytical models for predicting the trailing/leading edges noise from airfoils with serrated edges are implemented and applied to propellers using a blade strip approach. These models are assessed by comparison with spectra obtained from time-domain Lattice Boltzmann method simulations. Obtained results showed that the analytical models are able to predict the noise from either straight or serrated propellers with a good accuracy. A parametric study was conducted to predict the noise emitted by propellers featuring sawtooth trailing edge or leading edge serrations with different parameters. It is shown that the best performance in terms of noise reduction is achieved by sharp and deep serrations. The effects of flow conditions on the noise emitted by the serrated propellers are also investigated.

中文翻译：

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带锯齿边缘的微型 RPA 螺旋桨宽带噪声的分析预测

本文致力于分析具有直边或锯齿边的创新微型遥控飞机螺旋桨几何结构的宽带噪声。新的分析模型用于预测具有锯齿状边缘的翼型的后缘/前缘噪声，并使用叶片带方法应用于螺旋桨。通过与从时域格子玻尔兹曼方法模拟获得的光谱进行比较来评估这些模型。获得的结果表明，分析模型能够以良好的精度预测来自直螺旋桨或锯齿螺旋桨的噪声。进行了参数研究以预测具有不同参数的锯齿后缘或前缘锯齿的螺旋桨发出的噪声。结果表明，在降噪方面的最佳性能是通过尖锐和深的锯齿实现的。还研究了流动条件对锯齿状螺旋桨发出的噪音的影响。