摘要
以仿生学结构改善发动机的气动性能和噪声水平是当前绿色航空的研究热点,对控制对转螺旋桨的气动噪声具有重要的工程应用价值。本文通过地面声学环境下的气动噪声试验研究了仿生学锯齿结构对转螺旋桨的降噪特性,并测试了锯齿结构桨叶和基准桨的拉力、扭矩等气动性能和远场噪声指向性。试验结果表明,所设计的锯齿结构没有引起基准桨的气动性能损失,可以在保持气动性能的同时开展降噪设计。锯齿结构在4000~12000Hz频率区间,没有改变基准桨叶的噪声指向性特征,最大降噪量超过5dB;在所测转速工况的一阶通过频率、二阶通过频率处没有明显的降噪效果。这进一步说明锯齿结构对宽频噪声有降噪效果,对低频段的离散噪声降噪效果不明显。
Improving the aerodynamic performance and noise level of an engine with bionic structure is a hot research topic in green aviation,and it has important engineering application value for controlling the aerodynamic noise of counter-rotating propellers.In this paper,the aerodynamic noise reduction characteristics of the bionic sawtooth structure on the rotary propeller are investigated through the aerodynamic noise test under the ground acoustic environment,and the aerodynamic performances of the sawtooth blade and the reference propeller in terms of tension and torque,as well as the directivity of the far-field noise are tested.The test results show that the designed sawtooth structure does not cause the loss of the aerodynamic performance of the reference propeller,and the noise reduction design can be carried out while maintaining the aerodynamic performance.The sawtooth structure does not change the noise directivity characteristics of the reference blade in the frequency range of 4000~12000Hz,and the maximum noise reduction is more than 5dB;there is no obvious noise reduction effect in the first-order pass-by frequency and second-order pass-by frequency of the measured rotational speed conditions.This further indicates that the sawtooth structure has a noise reduction effect on the broadband noise,but not on the discrete noise in the low-frequency band.
作者
卫凯
曹琦
燕群
陈永辉
薛东文
陈伟杰
Wei Kai;Cao Qi;Yan Qun;Chen Yonghui;Xue Dongwen;Chen Weijie(National Key Laboratory of Aviation Acoustics and Vibration Aviation Technology,Aircraft Strength Research Institute of China,Xi’an 710065,China;National Key Laboratory of Strength and Structure Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;Northwestern Polytechnical University,Xi’an 710072,China)
出处
《航空科学技术》
2024年第5期125-130,共6页
Aeronautical Science & Technology
关键词
仿生学
锯齿结构
对转螺旋桨
气动噪声
试验测试
bionic type
sawtooth structure
counter-rotating propeller
aerodynamic noise
experimental test
