涡桨飞机螺旋桨气动噪声特性试验研究
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耿欣,男,博士。主要研究方向:螺旋桨气动噪声机理及降噪研究。E-mail:gengxin@buaa.edu.cn

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V233.7+;V212.11

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Investigation on the aeroacoustic characteristics of the turboprop propeller
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    摘要:

    随着航空公司短途航线由涡扇发动机转向涡轮螺旋桨发动机,以及机场周边噪声污染的限制越来越严格,商用螺旋桨飞机的声学特征正成为关键的设计参数。为研究螺旋桨的气动性能和声学特性,以某型涡桨飞机六叶螺旋桨为研究对象,在北京航空航天大学沙河校区D5气动声学风洞开展实验研究。实验中对螺旋桨在固定桨叶角设置和旋转速度条件下不同来流风速的组合工况进行测量,以获取不同工况下螺旋桨的天平测力数据和远场声压信号,经过快速傅里叶变换得到来流速度对螺旋桨远场噪声的影响规律。实验结果表明:在较大来流条件下离散部分噪声能激发出更高阶的谐波噪声,各阶谐波噪声幅值随着谐波数增大逐渐降低;当风速较低时宽频噪声声压级增大,这是由于在低前进比条件下,叶片处于失速状态,拉力系数处于非线性段,与叶片表面复杂流场引起的湍流噪声增加有关。通过指向性分析可知,位于桨盘上游位置的总声压级水平大于桨盘下游位置的总声压级水平,主要是因为螺旋桨桨盘前后的相对速度发生了变化,导致了声传播距离的延迟和加速现象。

    Abstract:

    As airlines switch from turbofan engines to turboprop engines on short-haul flights and noise pollution limits around airports become more limited, the acoustical characteristics of commercial propeller aircraft are becoming a key design parameter. In order to study the aerodynamic performance and acoustic characteristics of the propeller, a turboprop aircraft six-blade propeller was studied in the D5 aerodynamic acoustics wind tunnel of Shahe campus, Beijing University of Aeronautics and Astronautics. In the experiment, the combined working conditions of different incoming flow wind speeds were measured under the conditions of fixed blade Angle and rotating speed, so as to obtain the balance force measurement data and far-field sound pressure signal of the propeller under different working conditions. The influence law of incoming flow speed on the far-field noise of the propeller was obtained through the fast Fourier transform. The experimental results show that the discrete part noise can excite higher order harmonic noise under the condition of large incoming flow, and the amplitude of each order harmonic noise decreases gradually with the increase of harmonic number. When the wind speed is low, the sound pressure level of broadband noise increases. This is because the blade is in the stall state and the tension coefficient is in the nonlinear section under the condition of low forward ratio, which is related to the increase of turbulent noise caused by the complex flow field on the blade surface. According to the directivity analysis, the total SPL level at the upstream of the propeller disc is greater than that at the downstream of the propeller disc, mainly because the relative velocity of the propeller disc before and after the change, resulting in the delay of sound propagation distance and acceleration phenomenon.

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耿欣,胡天翔,周若君,等.涡桨飞机螺旋桨气动噪声特性试验研究[J].民用飞机设计与研 究,2022(1):64-69GENG Xin, HU Tianxiang, ZHOU Ruojun, et al. Investigation on the aeroacoustic characteristics of the turboprop propeller[J]. Civil Aircraft Design and Research,2022,(1):64-69. ( in Chinese)

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  • 在线发布日期: 2022-04-17
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