柔性薄板翼流固耦合振动噪声风洞试验研究

Wind tunnel experimental study on noise of flexible thin plate wing with fluid-solid interaction effects

柔性结构在风场中会发生流固耦合振动,其噪声特性要比流场中刚性结构气动噪声更为复杂.通过声学风洞试验,对比研究了流固耦合作用下不同柔性薄板翼模型的气动噪声特性.试验表明,随着结构柔性增加,薄翼气动噪声声压级对风速和迎角变化更加敏感.柔性平板翼噪声的频谱特性和声源位置都与刚性翼明显不同.研究发现,在特定迎角和风速下气动噪声强度会突然显著增强.给出了流固耦合作用下的平板翼气动噪声变化初步规律,为相关流固耦合振动噪声理论分析和数值模拟提供了试验支撑.

The flexible structure may generate fluid-structure coupled vibration in the wind field. At this time its noise characteristics are more complicated than the aeroacoustics of the rigid structure in the flow field. Through the acoustic wind tunnel test, the noise characteristics of different flexible thin plate-wing models under fluid were studied. Experiments show that with the increase of structural flexibility, the OASPL of the thin wing is more sensitive to changes of wind speed and angle of attack. The spectral characteristics and sound source position of the flexible plat-wing noise are obviously different from that of the rigid wing. The study found that the aeroacoustic intensity suddenly and remarkably increases at a specific angle of attack and wind speed. The preliminary law of the aeroacoustics variation of the plate-wing under the fluid-solid coupling is given, which provides the experimental support for the theoretical analysis and numerical simulation of the relevant fluid-structure coupled vibration noise.