EXPERIMENT ON SOUND SOURCE IDENTIFICATION OF ROTATING ROTOR BASED ON SONAH
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摘要: 在风洞开口实验段,针对不同风速及不同叶尖速比,应用Brükel&Kj?r公司60通道轮型声阵列及声信号采集系统对直径为1.4 m的S翼型风轮进行声场测试,并采用统计最优近场声全息（SONAH）技术进行旋转风轮低频噪声源识别及频域特征分析。实验结果表明:最大声强度是旋转叶片产生的基频噪声,其对应总声压级随风速增加呈函数f （x）=-0.0092x4+0.297x3-3.7403x2+23.186x+49.274增加,随叶尖速比增加呈函数f（x）=0.4467x4-10.273x3+87.728x2-328.75x+567.23增加;识别的噪声源最大能量中心集中于翼展位置约0.545 m,相对半径r/R=0.778处,且不随风速和尖速比的改变而改变。Abstract: In the open section of the wind tunnel,the sound field of S-wing rotating rotor with1.4-meter diameter was measured by BK60-channel type acoustic array and acoustic signals at different wind speed and different tip speed ratio was acquired. Low-frequency sound sources of rotating wind turbine were located using statistically optimal near-field acoustic holography（SONAH）. The experimental results showed that the maximum sound intensity is the fundamental frequency noise generated by the rotating blades,and the corresponding sound pressure level increased as a function f（x）=-0.0092 x~4+ 0.297 x~3-3.7403 x~2+ 23.186 x + 49.274 with the wind speed,and increased as a function f（x）=0.4467 x~4-10.273 x~3+ 87.728 x~2-328.75 x + 567.23 with the tip speed ratio. The center of the identified noise sources is concentrated on the radial position of about 0.545 m,that is r/R = 0.778,and did not change with wind speed and tip speed ratio.
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