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Prediction of near- and far-Held noise generated by contra-rotating open rotors

机译:反向旋转开放转子产生的近和远噪声

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摘要

An innovative aeroacoustic prediction method for Contra-Rotating Open Rotors (CROR) based on the nonlinear harmonic method (NLH) for the CFD computations and on the Ffowcs Williams and Hawkings (FW-H) equations for the far-field acoustic propagation is described. This method is tested on a generic 8×8 puller CROR at typical take-off conditions. The outstanding efficiency of the prediction method in terms of CPU cost is demonstrated in this study. An analysis of the aerodynamic interactions between the two rotors as well as of the aeroacoustic field radiated in the far-field is presented, allowing for an improved understanding of noise generation mechanisms.
机译:描述了一种基于CFD计算的非线性谐波方法(NLH)和基于Ffowcs Williams和Hawkings(FW-H)方程的用于远场声波传播的创新型对空旋转转子(CROR)的空气声预测方法。在典型起飞条件下,该方法在通用8×8拉马CROR上进行了测试。这项研究证明了预测方法在CPU成本方面的出色效率。提出了两个转子之间的空气动力学相互作用以及在远场中辐射的空气声场的分析,从而使人们对噪声产生机理有了更好的理解。

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