后缘襟翼侧缘加装挡板降噪数值模拟研究
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沈昀堃,男,硕士。主要研究方向:增升装置气动噪声数值模拟研究。E-mail:shenyk@buaa.edu.cn

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V211.3

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Numerical investigation of noise control for trailing edge flap with fence structure
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    摘要:

    在飞机的起飞着陆过程中,机体噪声是主要的噪声源,后缘襟翼侧缘噪声作为机体噪声的重要组成部分之一,其降噪技术的发展一直受到广泛关注。采用分离涡(Detached Eddy Simulation)湍流模型模拟襟翼侧缘的非定常流场,分析并探究了襟翼侧缘流场中双涡结构的产生及其演变过程的主要特征。基于上述结果,采用了被动流动控制法,在襟翼侧缘加装最大高度为一倍襟翼厚度的不规则挡板结构,应用FW-H方法计算了远场噪声频谱特性以及指向性并分析了与基准构型的差别,探究了加装襟翼挡板结构后对流场以及声场特性的影响。模拟结果表明,加装挡板结构对襟翼的气动特性影响较小,挡板结构改变了侧缘的流场形态和侧缘涡的结构,延迟了侧缘涡系的发展进程,使得涡系的融合位置后移,涡系融合破裂产生脉动压力的区域远离襟翼吸力面,从而达到降低噪声的效果。此外,加装挡板结构后,噪声仍然具有一定的偶极子指向特性,偶极子轴垂直于襟翼弦线,在襟翼的大部分方位噪声幅值降低1 dB~4 dB,降噪效果主要体现在中高频段的宽带噪声。

    Abstract:

    In the process of airplane take-off and landing, airframe noise due to trailing edge flap is one of the main noise sources, noise reduction technology of trailing edge flap has attracted much attention. By numerical simulation of the unsteady flow field of the flap side-edge, the main characteristics of the generation and evolution of the dual vortex structure in the flow field were analyzed. Then a fence structure with the same dimension as the flap thickness was proposed on the side-edge of the flap. The simulation results show that adding fence has little effect on the aerodynamic characteristics. The fence changes the flow field of the flap side-edge and the structure of the side edge vortex, delaying the development of the side-edge vortex system and making the position of the vortex combination and breakdown far away from the suction surface of the flap, so as to reduce the noise. In addition, after adding the fence structure, the noise still has certain dipole directional characteristics, and the dipole axis is perpendicular to the flap chord line. The noise amplitude was reduced by 1dB~8dB in most directions, and the noise reduction effect was mainly embodied in the broadband noise of the mid-to-high frequency band.

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沈昀堃,张瑾,刘沛清.后缘襟翼侧缘加装挡板降噪数值模拟研究[J].民用飞机设计与研 究,2022(1):70-76SHEN Yunkun, ZHANG Jin, LIU Peiqing. Numerical investigation of noise control for trailing edge flap with fence structure[J]. Civil Aircraft Design and Research,2022,(1):70-76. ( in Chinese)

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  • 在线发布日期: 2022-04-17
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